From: Penny Zheng <penny.zheng@arm.com>
Current P2M implementation is designed for MMU system only.
We move the MMU-specific codes into mmu/p2m.c, and only keep generic
codes in p2m.c, like VMID allocator, etc. We also move MMU-specific
definitions and declarations to mmu/p2m.h, such as p2m_tlb_flush_sync().
Also expose previously static functions p2m_vmid_allocator_init(),
p2m_alloc_vmid() for further MPU usage. Since with the code movement
p2m_free_vmid() is now used in two files, also expose p2m_free_vmid().
With the code movement, global variable max_vmid is used in multiple
files instead of a single file (and will be used in MPU P2M
implementation), declare it in the header and remove the "static" of
this variable.
Also, since p2m_invalidate_root() should be MMU only and after the
code movement the only caller of p2m_invalidate_root() outside of
mmu/p2m.c is arch_domain_creation_finished(), creating a new function
named p2m_domain_creation_finished() in mmu/p2m.c for the original
code in arch_domain_creation_finished(), and marking
p2m_invalidate_root() as static.
Take the opportunity to fix the incorrect coding style when possible.
When there is bit shift in macros, take the opportunity to add the
missing 'U' as a compliance of MISRA.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Wei Chen <wei.chen@arm.com>
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
---
v8:
- Note: The renaming of p2m_flush_vm() is not done due to the
unclarity of other maintainers' ideas.
- Also move P2M_ROOT_LEVEL, P2M_ROOT_ORDER and P2M_ROOT_PAGES to
mmu/p2m.h. Move the two functions using p2m->root to mmu/p2m.c.
- Also move the declaration of p2m_clear_root_pages() to mmu/p2m.h.
- Expose p2m_free_vmid() as it is now used by two files.
- Take the opportunity to use 1U and add space before/after <<,
update the commit message about this.
- Do not export setup_virt_paging_one(), instead, move
cpu_virt_paging_callback() & co to mmu/p2m.c.
- Create a new function p2m_domain_creation_finished() in mmu/p2m.c
for the original code in arch_domain_creation_finished(), and mark
p2m_invalidate_root() as static.
v7:
- No change.
v6:
- Also move relinquish_p2m_mapping() to mmu/p2m.c, make
__p2m_set_entry() static.
- Also move p2m_clear_root_pages() and p2m_flush_vm() to mmu/p2m.c.
- Don't add #ifdef CONFIG_MMU to the p2m_tlb_flush_sync() in
p2m_write_unlock(), this need further discussion.
- Correct typo in commit message.
v5:
- No change
v4:
- Rework the patch to drop the unnecessary changes.
- Rework the commit msg a bit.
v3:
- remove MPU stubs
- adapt to the introduction of new directories: mmu/
v2:
- new commit
---
xen/arch/arm/domain.c | 11 +-
xen/arch/arm/include/asm/mmu/p2m.h | 26 +
xen/arch/arm/include/asm/p2m.h | 32 +-
xen/arch/arm/mmu/Makefile | 1 +
xen/arch/arm/mmu/p2m.c | 1834 ++++++++++++++++++++++++++
xen/arch/arm/p2m.c | 1909 +---------------------------
6 files changed, 1933 insertions(+), 1880 deletions(-)
create mode 100644 xen/arch/arm/include/asm/mmu/p2m.h
create mode 100644 xen/arch/arm/mmu/p2m.c
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 28e3aaa5e4..5e7a7f3e7e 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -870,16 +870,7 @@ int arch_domain_soft_reset(struct domain *d)
void arch_domain_creation_finished(struct domain *d)
{
- /*
- * To avoid flushing the whole guest RAM on the first Set/Way, we
- * invalidate the P2M to track what has been accessed.
- *
- * This is only turned when IOMMU is not used or the page-table are
- * not shared because bit[0] (e.g valid bit) unset will result
- * IOMMU fault that could be not fixed-up.
- */
- if ( !iommu_use_hap_pt(d) )
- p2m_invalidate_root(p2m_get_hostp2m(d));
+ p2m_domain_creation_finished(d);
}
static int is_guest_pv32_psr(uint32_t psr)
diff --git a/xen/arch/arm/include/asm/mmu/p2m.h b/xen/arch/arm/include/asm/mmu/p2m.h
new file mode 100644
index 0000000000..58496c0b09
--- /dev/null
+++ b/xen/arch/arm/include/asm/mmu/p2m.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __ARM_MMU_P2M_H__
+#define __ARM_MMU_P2M_H__
+
+extern unsigned int p2m_root_order;
+extern unsigned int p2m_root_level;
+#define P2M_ROOT_ORDER p2m_root_order
+#define P2M_ROOT_LEVEL p2m_root_level
+#define P2M_ROOT_PAGES (1U << P2M_ROOT_ORDER)
+
+struct p2m_domain;
+void p2m_force_tlb_flush_sync(struct p2m_domain *p2m);
+void p2m_tlb_flush_sync(struct p2m_domain *p2m);
+
+void p2m_clear_root_pages(struct p2m_domain *p2m);
+
+#endif /* __ARM_MMU_P2M_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/include/asm/p2m.h b/xen/arch/arm/include/asm/p2m.h
index 940495d42b..e7428fb8db 100644
--- a/xen/arch/arm/include/asm/p2m.h
+++ b/xen/arch/arm/include/asm/p2m.h
@@ -14,10 +14,19 @@
/* Holds the bit size of IPAs in p2m tables. */
extern unsigned int p2m_ipa_bits;
-extern unsigned int p2m_root_order;
-extern unsigned int p2m_root_level;
-#define P2M_ROOT_ORDER p2m_root_order
-#define P2M_ROOT_LEVEL p2m_root_level
+#define MAX_VMID_8_BIT (1UL << 8)
+#define MAX_VMID_16_BIT (1UL << 16)
+
+#define INVALID_VMID 0 /* VMID 0 is reserved */
+
+#ifdef CONFIG_ARM_64
+extern unsigned int max_vmid;
+/* VMID is by default 8 bit width on AArch64 */
+#define MAX_VMID max_vmid
+#else
+/* VMID is always 8 bit width on AArch32 */
+#define MAX_VMID MAX_VMID_8_BIT
+#endif
struct domain;
@@ -156,6 +165,12 @@ typedef enum {
#endif
#include <xen/p2m-common.h>
+#if defined(CONFIG_MMU)
+# include <asm/mmu/p2m.h>
+#else
+# error "Unknown memory management layout"
+#endif
+
static inline bool arch_acquire_resource_check(struct domain *d)
{
/*
@@ -180,6 +195,10 @@ void p2m_altp2m_check(struct vcpu *v, uint16_t idx)
*/
void p2m_restrict_ipa_bits(unsigned int ipa_bits);
+void p2m_vmid_allocator_init(void);
+int p2m_alloc_vmid(struct domain *d);
+void p2m_free_vmid(struct domain *d);
+
/* Second stage paging setup, to be called on all CPUs */
void setup_virt_paging(void);
@@ -242,8 +261,6 @@ static inline int p2m_is_write_locked(struct p2m_domain *p2m)
return rw_is_write_locked(&p2m->lock);
}
-void p2m_tlb_flush_sync(struct p2m_domain *p2m);
-
/* Look up the MFN corresponding to a domain's GFN. */
mfn_t p2m_lookup(struct domain *d, gfn_t gfn, p2m_type_t *t);
@@ -271,8 +288,7 @@ int p2m_set_entry(struct p2m_domain *p2m,
bool p2m_resolve_translation_fault(struct domain *d, gfn_t gfn);
-void p2m_clear_root_pages(struct p2m_domain *p2m);
-void p2m_invalidate_root(struct p2m_domain *p2m);
+void p2m_domain_creation_finished(struct domain *d);
/*
* Clean & invalidate caches corresponding to a region [start,end) of guest
diff --git a/xen/arch/arm/mmu/Makefile b/xen/arch/arm/mmu/Makefile
index 98aea965df..67475fcd80 100644
--- a/xen/arch/arm/mmu/Makefile
+++ b/xen/arch/arm/mmu/Makefile
@@ -1,3 +1,4 @@
+obj-y += p2m.o
obj-y += pt.o
obj-y += setup.o
obj-y += smpboot.o
diff --git a/xen/arch/arm/mmu/p2m.c b/xen/arch/arm/mmu/p2m.c
new file mode 100644
index 0000000000..6a5a080307
--- /dev/null
+++ b/xen/arch/arm/mmu/p2m.c
@@ -0,0 +1,1834 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <xen/cpu.h>
+#include <xen/domain_page.h>
+#include <xen/ioreq.h>
+#include <xen/lib.h>
+#include <xen/sched.h>
+#include <xen/softirq.h>
+
+#include <asm/alternative.h>
+#include <asm/event.h>
+#include <asm/flushtlb.h>
+#include <asm/page.h>
+
+unsigned int __read_mostly p2m_root_order;
+unsigned int __read_mostly p2m_root_level;
+
+static mfn_t __read_mostly empty_root_mfn;
+
+static uint64_t generate_vttbr(uint16_t vmid, mfn_t root_mfn)
+{
+ return (mfn_to_maddr(root_mfn) | ((uint64_t)vmid << 48));
+}
+
+static struct page_info *p2m_alloc_page(struct domain *d)
+{
+ struct page_info *pg;
+
+ /*
+ * For hardware domain, there should be no limit in the number of pages that
+ * can be allocated, so that the kernel may take advantage of the extended
+ * regions. Hence, allocate p2m pages for hardware domains from heap.
+ */
+ if ( is_hardware_domain(d) )
+ {
+ pg = alloc_domheap_page(NULL, 0);
+ if ( pg == NULL )
+ printk(XENLOG_G_ERR "Failed to allocate P2M pages for hwdom.\n");
+ }
+ else
+ {
+ spin_lock(&d->arch.paging.lock);
+ pg = page_list_remove_head(&d->arch.paging.p2m_freelist);
+ spin_unlock(&d->arch.paging.lock);
+ }
+
+ return pg;
+}
+
+static void p2m_free_page(struct domain *d, struct page_info *pg)
+{
+ if ( is_hardware_domain(d) )
+ free_domheap_page(pg);
+ else
+ {
+ spin_lock(&d->arch.paging.lock);
+ page_list_add_tail(pg, &d->arch.paging.p2m_freelist);
+ spin_unlock(&d->arch.paging.lock);
+ }
+}
+
+/* Return the size of the pool, in bytes. */
+int arch_get_paging_mempool_size(struct domain *d, uint64_t *size)
+{
+ *size = (uint64_t)ACCESS_ONCE(d->arch.paging.p2m_total_pages) << PAGE_SHIFT;
+ return 0;
+}
+
+/*
+ * Set the pool of pages to the required number of pages.
+ * Returns 0 for success, non-zero for failure.
+ * Call with d->arch.paging.lock held.
+ */
+int p2m_set_allocation(struct domain *d, unsigned long pages, bool *preempted)
+{
+ struct page_info *pg;
+
+ ASSERT(spin_is_locked(&d->arch.paging.lock));
+
+ for ( ; ; )
+ {
+ if ( d->arch.paging.p2m_total_pages < pages )
+ {
+ /* Need to allocate more memory from domheap */
+ pg = alloc_domheap_page(NULL, 0);
+ if ( pg == NULL )
+ {
+ printk(XENLOG_ERR "Failed to allocate P2M pages.\n");
+ return -ENOMEM;
+ }
+ ACCESS_ONCE(d->arch.paging.p2m_total_pages) =
+ d->arch.paging.p2m_total_pages + 1;
+ page_list_add_tail(pg, &d->arch.paging.p2m_freelist);
+ }
+ else if ( d->arch.paging.p2m_total_pages > pages )
+ {
+ /* Need to return memory to domheap */
+ pg = page_list_remove_head(&d->arch.paging.p2m_freelist);
+ if( pg )
+ {
+ ACCESS_ONCE(d->arch.paging.p2m_total_pages) =
+ d->arch.paging.p2m_total_pages - 1;
+ free_domheap_page(pg);
+ }
+ else
+ {
+ printk(XENLOG_ERR
+ "Failed to free P2M pages, P2M freelist is empty.\n");
+ return -ENOMEM;
+ }
+ }
+ else
+ break;
+
+ /* Check to see if we need to yield and try again */
+ if ( preempted && general_preempt_check() )
+ {
+ *preempted = true;
+ return -ERESTART;
+ }
+ }
+
+ return 0;
+}
+
+int arch_set_paging_mempool_size(struct domain *d, uint64_t size)
+{
+ unsigned long pages = size >> PAGE_SHIFT;
+ bool preempted = false;
+ int rc;
+
+ if ( (size & ~PAGE_MASK) || /* Non page-sized request? */
+ pages != (size >> PAGE_SHIFT) ) /* 32-bit overflow? */
+ return -EINVAL;
+
+ spin_lock(&d->arch.paging.lock);
+ rc = p2m_set_allocation(d, pages, &preempted);
+ spin_unlock(&d->arch.paging.lock);
+
+ ASSERT(preempted == (rc == -ERESTART));
+
+ return rc;
+}
+
+int p2m_teardown_allocation(struct domain *d)
+{
+ int ret = 0;
+ bool preempted = false;
+
+ spin_lock(&d->arch.paging.lock);
+ if ( d->arch.paging.p2m_total_pages != 0 )
+ {
+ ret = p2m_set_allocation(d, 0, &preempted);
+ if ( preempted )
+ {
+ spin_unlock(&d->arch.paging.lock);
+ return -ERESTART;
+ }
+ ASSERT(d->arch.paging.p2m_total_pages == 0);
+ }
+ spin_unlock(&d->arch.paging.lock);
+
+ return ret;
+}
+
+void p2m_dump_info(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+
+ p2m_read_lock(p2m);
+ printk("p2m mappings for domain %d (vmid %d):\n",
+ d->domain_id, p2m->vmid);
+ BUG_ON(p2m->stats.mappings[0] || p2m->stats.shattered[0]);
+ printk(" 1G mappings: %ld (shattered %ld)\n",
+ p2m->stats.mappings[1], p2m->stats.shattered[1]);
+ printk(" 2M mappings: %ld (shattered %ld)\n",
+ p2m->stats.mappings[2], p2m->stats.shattered[2]);
+ printk(" 4K mappings: %ld\n", p2m->stats.mappings[3]);
+ p2m_read_unlock(p2m);
+}
+
+void dump_p2m_lookup(struct domain *d, paddr_t addr)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+
+ printk("dom%d IPA 0x%"PRIpaddr"\n", d->domain_id, addr);
+
+ printk("P2M @ %p mfn:%#"PRI_mfn"\n",
+ p2m->root, mfn_x(page_to_mfn(p2m->root)));
+
+ dump_pt_walk(page_to_maddr(p2m->root), addr,
+ P2M_ROOT_LEVEL, P2M_ROOT_PAGES);
+}
+
+/*
+ * p2m_save_state and p2m_restore_state work in pair to workaround
+ * ARM64_WORKAROUND_AT_SPECULATE. p2m_save_state will set-up VTTBR to
+ * point to the empty page-tables to stop allocating TLB entries.
+ */
+void p2m_save_state(struct vcpu *p)
+{
+ p->arch.sctlr = READ_SYSREG(SCTLR_EL1);
+
+ if ( cpus_have_const_cap(ARM64_WORKAROUND_AT_SPECULATE) )
+ {
+ WRITE_SYSREG64(generate_vttbr(INVALID_VMID, empty_root_mfn), VTTBR_EL2);
+ /*
+ * Ensure VTTBR_EL2 is correctly synchronized so we can restore
+ * the next vCPU context without worrying about AT instruction
+ * speculation.
+ */
+ isb();
+ }
+}
+
+void p2m_restore_state(struct vcpu *n)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(n->domain);
+ uint8_t *last_vcpu_ran;
+
+ if ( is_idle_vcpu(n) )
+ return;
+
+ WRITE_SYSREG(n->arch.sctlr, SCTLR_EL1);
+ WRITE_SYSREG(n->arch.hcr_el2, HCR_EL2);
+
+ /*
+ * ARM64_WORKAROUND_AT_SPECULATE: VTTBR_EL2 should be restored after all
+ * registers associated to EL1/EL0 translations regime have been
+ * synchronized.
+ */
+ asm volatile(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_AT_SPECULATE));
+ WRITE_SYSREG64(p2m->vttbr, VTTBR_EL2);
+
+ last_vcpu_ran = &p2m->last_vcpu_ran[smp_processor_id()];
+
+ /*
+ * While we are restoring an out-of-context translation regime
+ * we still need to ensure:
+ * - VTTBR_EL2 is synchronized before flushing the TLBs
+ * - All registers for EL1 are synchronized before executing an AT
+ * instructions targeting S1/S2.
+ */
+ isb();
+
+ /*
+ * Flush local TLB for the domain to prevent wrong TLB translation
+ * when running multiple vCPU of the same domain on a single pCPU.
+ */
+ if ( *last_vcpu_ran != INVALID_VCPU_ID && *last_vcpu_ran != n->vcpu_id )
+ flush_guest_tlb_local();
+
+ *last_vcpu_ran = n->vcpu_id;
+}
+
+/*
+ * Force a synchronous P2M TLB flush.
+ *
+ * Must be called with the p2m lock held.
+ */
+void p2m_force_tlb_flush_sync(struct p2m_domain *p2m)
+{
+ unsigned long flags = 0;
+ uint64_t ovttbr;
+
+ ASSERT(p2m_is_write_locked(p2m));
+
+ /*
+ * ARM only provides an instruction to flush TLBs for the current
+ * VMID. So switch to the VTTBR of a given P2M if different.
+ */
+ ovttbr = READ_SYSREG64(VTTBR_EL2);
+ if ( ovttbr != p2m->vttbr )
+ {
+ uint64_t vttbr;
+
+ local_irq_save(flags);
+
+ /*
+ * ARM64_WORKAROUND_AT_SPECULATE: We need to stop AT to allocate
+ * TLBs entries because the context is partially modified. We
+ * only need the VMID for flushing the TLBs, so we can generate
+ * a new VTTBR with the VMID to flush and the empty root table.
+ */
+ if ( !cpus_have_const_cap(ARM64_WORKAROUND_AT_SPECULATE) )
+ vttbr = p2m->vttbr;
+ else
+ vttbr = generate_vttbr(p2m->vmid, empty_root_mfn);
+
+ WRITE_SYSREG64(vttbr, VTTBR_EL2);
+
+ /* Ensure VTTBR_EL2 is synchronized before flushing the TLBs */
+ isb();
+ }
+
+ flush_guest_tlb();
+
+ if ( ovttbr != READ_SYSREG64(VTTBR_EL2) )
+ {
+ WRITE_SYSREG64(ovttbr, VTTBR_EL2);
+ /* Ensure VTTBR_EL2 is back in place before continuing. */
+ isb();
+ local_irq_restore(flags);
+ }
+
+ p2m->need_flush = false;
+}
+
+void p2m_tlb_flush_sync(struct p2m_domain *p2m)
+{
+ if ( p2m->need_flush )
+ p2m_force_tlb_flush_sync(p2m);
+}
+
+/*
+ * Find and map the root page table. The caller is responsible for
+ * unmapping the table.
+ *
+ * The function will return NULL if the offset of the root table is
+ * invalid.
+ */
+static lpae_t *p2m_get_root_pointer(struct p2m_domain *p2m,
+ gfn_t gfn)
+{
+ unsigned long root_table;
+
+ /*
+ * While the root table index is the offset from the previous level,
+ * we can't use (P2M_ROOT_LEVEL - 1) because the root level might be
+ * 0. Yet we still want to check if all the unused bits are zeroed.
+ */
+ root_table = gfn_x(gfn) >> (XEN_PT_LEVEL_ORDER(P2M_ROOT_LEVEL) +
+ XEN_PT_LPAE_SHIFT);
+ if ( root_table >= P2M_ROOT_PAGES )
+ return NULL;
+
+ return __map_domain_page(p2m->root + root_table);
+}
+
+/*
+ * Lookup the MFN corresponding to a domain's GFN.
+ * Lookup mem access in the ratrix tree.
+ * The entries associated to the GFN is considered valid.
+ */
+static p2m_access_t p2m_mem_access_radix_get(struct p2m_domain *p2m, gfn_t gfn)
+{
+ void *ptr;
+
+ if ( !p2m->mem_access_enabled )
+ return p2m->default_access;
+
+ ptr = radix_tree_lookup(&p2m->mem_access_settings, gfn_x(gfn));
+ if ( !ptr )
+ return p2m_access_rwx;
+ else
+ return radix_tree_ptr_to_int(ptr);
+}
+
+/*
+ * In the case of the P2M, the valid bit is used for other purpose. Use
+ * the type to check whether an entry is valid.
+ */
+static inline bool p2m_is_valid(lpae_t pte)
+{
+ return pte.p2m.type != p2m_invalid;
+}
+
+/*
+ * lpae_is_* helpers don't check whether the valid bit is set in the
+ * PTE. Provide our own overlay to check the valid bit.
+ */
+static inline bool p2m_is_mapping(lpae_t pte, unsigned int level)
+{
+ return p2m_is_valid(pte) && lpae_is_mapping(pte, level);
+}
+
+static inline bool p2m_is_superpage(lpae_t pte, unsigned int level)
+{
+ return p2m_is_valid(pte) && lpae_is_superpage(pte, level);
+}
+
+#define GUEST_TABLE_MAP_FAILED 0
+#define GUEST_TABLE_SUPER_PAGE 1
+#define GUEST_TABLE_NORMAL_PAGE 2
+
+static int p2m_create_table(struct p2m_domain *p2m, lpae_t *entry);
+
+/*
+ * Take the currently mapped table, find the corresponding GFN entry,
+ * and map the next table, if available. The previous table will be
+ * unmapped if the next level was mapped (e.g GUEST_TABLE_NORMAL_PAGE
+ * returned).
+ *
+ * The read_only parameters indicates whether intermediate tables should
+ * be allocated when not present.
+ *
+ * Return values:
+ * GUEST_TABLE_MAP_FAILED: Either read_only was set and the entry
+ * was empty, or allocating a new page failed.
+ * GUEST_TABLE_NORMAL_PAGE: next level mapped normally
+ * GUEST_TABLE_SUPER_PAGE: The next entry points to a superpage.
+ */
+static int p2m_next_level(struct p2m_domain *p2m, bool read_only,
+ unsigned int level, lpae_t **table,
+ unsigned int offset)
+{
+ lpae_t *entry;
+ int ret;
+ mfn_t mfn;
+
+ entry = *table + offset;
+
+ if ( !p2m_is_valid(*entry) )
+ {
+ if ( read_only )
+ return GUEST_TABLE_MAP_FAILED;
+
+ ret = p2m_create_table(p2m, entry);
+ if ( ret )
+ return GUEST_TABLE_MAP_FAILED;
+ }
+
+ /* The function p2m_next_level is never called at the 3rd level */
+ ASSERT(level < 3);
+ if ( p2m_is_mapping(*entry, level) )
+ return GUEST_TABLE_SUPER_PAGE;
+
+ mfn = lpae_get_mfn(*entry);
+
+ unmap_domain_page(*table);
+ *table = map_domain_page(mfn);
+
+ return GUEST_TABLE_NORMAL_PAGE;
+}
+
+/*
+ * Get the details of a given gfn.
+ *
+ * If the entry is present, the associated MFN will be returned and the
+ * access and type filled up. The page_order will correspond to the
+ * order of the mapping in the page table (i.e it could be a superpage).
+ *
+ * If the entry is not present, INVALID_MFN will be returned and the
+ * page_order will be set according to the order of the invalid range.
+ *
+ * valid will contain the value of bit[0] (e.g valid bit) of the
+ * entry.
+ */
+mfn_t p2m_get_entry(struct p2m_domain *p2m, gfn_t gfn,
+ p2m_type_t *t, p2m_access_t *a,
+ unsigned int *page_order,
+ bool *valid)
+{
+ paddr_t addr = gfn_to_gaddr(gfn);
+ unsigned int level = 0;
+ lpae_t entry, *table;
+ int rc;
+ mfn_t mfn = INVALID_MFN;
+ p2m_type_t _t;
+ DECLARE_OFFSETS(offsets, addr);
+
+ ASSERT(p2m_is_locked(p2m));
+ BUILD_BUG_ON(THIRD_MASK != PAGE_MASK);
+
+ /* Allow t to be NULL */
+ t = t ?: &_t;
+
+ *t = p2m_invalid;
+
+ if ( valid )
+ *valid = false;
+
+ /* XXX: Check if the mapping is lower than the mapped gfn */
+
+ /* This gfn is higher than the highest the p2m map currently holds */
+ if ( gfn_x(gfn) > gfn_x(p2m->max_mapped_gfn) )
+ {
+ for ( level = P2M_ROOT_LEVEL; level < 3; level++ )
+ if ( (gfn_x(gfn) & (XEN_PT_LEVEL_MASK(level) >> PAGE_SHIFT)) >
+ gfn_x(p2m->max_mapped_gfn) )
+ break;
+
+ goto out;
+ }
+
+ table = p2m_get_root_pointer(p2m, gfn);
+
+ /*
+ * the table should always be non-NULL because the gfn is below
+ * p2m->max_mapped_gfn and the root table pages are always present.
+ */
+ if ( !table )
+ {
+ ASSERT_UNREACHABLE();
+ level = P2M_ROOT_LEVEL;
+ goto out;
+ }
+
+ for ( level = P2M_ROOT_LEVEL; level < 3; level++ )
+ {
+ rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
+ if ( rc == GUEST_TABLE_MAP_FAILED )
+ goto out_unmap;
+ else if ( rc != GUEST_TABLE_NORMAL_PAGE )
+ break;
+ }
+
+ entry = table[offsets[level]];
+
+ if ( p2m_is_valid(entry) )
+ {
+ *t = entry.p2m.type;
+
+ if ( a )
+ *a = p2m_mem_access_radix_get(p2m, gfn);
+
+ mfn = lpae_get_mfn(entry);
+ /*
+ * The entry may point to a superpage. Find the MFN associated
+ * to the GFN.
+ */
+ mfn = mfn_add(mfn,
+ gfn_x(gfn) & ((1UL << XEN_PT_LEVEL_ORDER(level)) - 1));
+
+ if ( valid )
+ *valid = lpae_is_valid(entry);
+ }
+
+out_unmap:
+ unmap_domain_page(table);
+
+out:
+ if ( page_order )
+ *page_order = XEN_PT_LEVEL_ORDER(level);
+
+ return mfn;
+}
+
+static void p2m_set_permission(lpae_t *e, p2m_type_t t, p2m_access_t a)
+{
+ /* First apply type permissions */
+ switch ( t )
+ {
+ case p2m_ram_rw:
+ e->p2m.xn = 0;
+ e->p2m.write = 1;
+ break;
+
+ case p2m_ram_ro:
+ e->p2m.xn = 0;
+ e->p2m.write = 0;
+ break;
+
+ case p2m_iommu_map_rw:
+ case p2m_map_foreign_rw:
+ case p2m_grant_map_rw:
+ case p2m_mmio_direct_dev:
+ case p2m_mmio_direct_nc:
+ case p2m_mmio_direct_c:
+ e->p2m.xn = 1;
+ e->p2m.write = 1;
+ break;
+
+ case p2m_iommu_map_ro:
+ case p2m_map_foreign_ro:
+ case p2m_grant_map_ro:
+ case p2m_invalid:
+ e->p2m.xn = 1;
+ e->p2m.write = 0;
+ break;
+
+ case p2m_max_real_type:
+ BUG();
+ break;
+ }
+
+ /* Then restrict with access permissions */
+ switch ( a )
+ {
+ case p2m_access_rwx:
+ break;
+ case p2m_access_wx:
+ e->p2m.read = 0;
+ break;
+ case p2m_access_rw:
+ e->p2m.xn = 1;
+ break;
+ case p2m_access_w:
+ e->p2m.read = 0;
+ e->p2m.xn = 1;
+ break;
+ case p2m_access_rx:
+ case p2m_access_rx2rw:
+ e->p2m.write = 0;
+ break;
+ case p2m_access_x:
+ e->p2m.write = 0;
+ e->p2m.read = 0;
+ break;
+ case p2m_access_r:
+ e->p2m.write = 0;
+ e->p2m.xn = 1;
+ break;
+ case p2m_access_n:
+ case p2m_access_n2rwx:
+ e->p2m.read = e->p2m.write = 0;
+ e->p2m.xn = 1;
+ break;
+ }
+}
+
+static lpae_t mfn_to_p2m_entry(mfn_t mfn, p2m_type_t t, p2m_access_t a)
+{
+ /*
+ * sh, xn and write bit will be defined in the following switches
+ * based on mattr and t.
+ */
+ lpae_t e = (lpae_t) {
+ .p2m.af = 1,
+ .p2m.read = 1,
+ .p2m.table = 1,
+ .p2m.valid = 1,
+ .p2m.type = t,
+ };
+
+ BUILD_BUG_ON(p2m_max_real_type > (1 << 4));
+
+ switch ( t )
+ {
+ case p2m_mmio_direct_dev:
+ e.p2m.mattr = MATTR_DEV;
+ e.p2m.sh = LPAE_SH_OUTER;
+ break;
+
+ case p2m_mmio_direct_c:
+ e.p2m.mattr = MATTR_MEM;
+ e.p2m.sh = LPAE_SH_OUTER;
+ break;
+
+ /*
+ * ARM ARM: Overlaying the shareability attribute (DDI
+ * 0406C.b B3-1376 to 1377)
+ *
+ * A memory region with a resultant memory type attribute of Normal,
+ * and a resultant cacheability attribute of Inner Non-cacheable,
+ * Outer Non-cacheable, must have a resultant shareability attribute
+ * of Outer Shareable, otherwise shareability is UNPREDICTABLE.
+ *
+ * On ARMv8 shareability is ignored and explicitly treated as Outer
+ * Shareable for Normal Inner Non_cacheable, Outer Non-cacheable.
+ * See the note for table D4-40, in page 1788 of the ARM DDI 0487A.j.
+ */
+ case p2m_mmio_direct_nc:
+ e.p2m.mattr = MATTR_MEM_NC;
+ e.p2m.sh = LPAE_SH_OUTER;
+ break;
+
+ default:
+ e.p2m.mattr = MATTR_MEM;
+ e.p2m.sh = LPAE_SH_INNER;
+ }
+
+ p2m_set_permission(&e, t, a);
+
+ ASSERT(!(mfn_to_maddr(mfn) & ~PADDR_MASK));
+
+ lpae_set_mfn(e, mfn);
+
+ return e;
+}
+
+/* Generate table entry with correct attributes. */
+static lpae_t page_to_p2m_table(struct page_info *page)
+{
+ /*
+ * The access value does not matter because the hardware will ignore
+ * the permission fields for table entry.
+ *
+ * We use p2m_ram_rw so the entry has a valid type. This is important
+ * for p2m_is_valid() to return valid on table entries.
+ */
+ return mfn_to_p2m_entry(page_to_mfn(page), p2m_ram_rw, p2m_access_rwx);
+}
+
+static inline void p2m_write_pte(lpae_t *p, lpae_t pte, bool clean_pte)
+{
+ write_pte(p, pte);
+ if ( clean_pte )
+ clean_dcache(*p);
+}
+
+static inline void p2m_remove_pte(lpae_t *p, bool clean_pte)
+{
+ lpae_t pte;
+
+ memset(&pte, 0x00, sizeof(pte));
+ p2m_write_pte(p, pte, clean_pte);
+}
+
+/* Allocate a new page table page and hook it in via the given entry. */
+static int p2m_create_table(struct p2m_domain *p2m, lpae_t *entry)
+{
+ struct page_info *page;
+ lpae_t *p;
+
+ ASSERT(!p2m_is_valid(*entry));
+
+ page = p2m_alloc_page(p2m->domain);
+ if ( page == NULL )
+ return -ENOMEM;
+
+ page_list_add(page, &p2m->pages);
+
+ p = __map_domain_page(page);
+ clear_page(p);
+
+ if ( p2m->clean_pte )
+ clean_dcache_va_range(p, PAGE_SIZE);
+
+ unmap_domain_page(p);
+
+ p2m_write_pte(entry, page_to_p2m_table(page), p2m->clean_pte);
+
+ return 0;
+}
+
+static int p2m_mem_access_radix_set(struct p2m_domain *p2m, gfn_t gfn,
+ p2m_access_t a)
+{
+ int rc;
+
+ if ( !p2m->mem_access_enabled )
+ return 0;
+
+ if ( p2m_access_rwx == a )
+ {
+ radix_tree_delete(&p2m->mem_access_settings, gfn_x(gfn));
+ return 0;
+ }
+
+ rc = radix_tree_insert(&p2m->mem_access_settings, gfn_x(gfn),
+ radix_tree_int_to_ptr(a));
+ if ( rc == -EEXIST )
+ {
+ /* If a setting already exists, change it to the new one */
+ radix_tree_replace_slot(
+ radix_tree_lookup_slot(
+ &p2m->mem_access_settings, gfn_x(gfn)),
+ radix_tree_int_to_ptr(a));
+ rc = 0;
+ }
+
+ return rc;
+}
+
+/*
+ * Put any references on the single 4K page referenced by pte.
+ * TODO: Handle superpages, for now we only take special references for leaf
+ * pages (specifically foreign ones, which can't be super mapped today).
+ */
+static void p2m_put_l3_page(const lpae_t pte)
+{
+ mfn_t mfn = lpae_get_mfn(pte);
+
+ ASSERT(p2m_is_valid(pte));
+
+ /*
+ * TODO: Handle other p2m types
+ *
+ * It's safe to do the put_page here because page_alloc will
+ * flush the TLBs if the page is reallocated before the end of
+ * this loop.
+ */
+ if ( p2m_is_foreign(pte.p2m.type) )
+ {
+ ASSERT(mfn_valid(mfn));
+ put_page(mfn_to_page(mfn));
+ }
+ /* Detect the xenheap page and mark the stored GFN as invalid. */
+ else if ( p2m_is_ram(pte.p2m.type) && is_xen_heap_mfn(mfn) )
+ page_set_xenheap_gfn(mfn_to_page(mfn), INVALID_GFN);
+}
+
+/* Free lpae sub-tree behind an entry */
+static void p2m_free_entry(struct p2m_domain *p2m,
+ lpae_t entry, unsigned int level)
+{
+ unsigned int i;
+ lpae_t *table;
+ mfn_t mfn;
+ struct page_info *pg;
+
+ /* Nothing to do if the entry is invalid. */
+ if ( !p2m_is_valid(entry) )
+ return;
+
+ if ( p2m_is_superpage(entry, level) || (level == 3) )
+ {
+#ifdef CONFIG_IOREQ_SERVER
+ /*
+ * If this gets called then either the entry was replaced by an entry
+ * with a different base (valid case) or the shattering of a superpage
+ * has failed (error case).
+ * So, at worst, the spurious mapcache invalidation might be sent.
+ */
+ if ( p2m_is_ram(entry.p2m.type) &&
+ domain_has_ioreq_server(p2m->domain) )
+ ioreq_request_mapcache_invalidate(p2m->domain);
+#endif
+
+ p2m->stats.mappings[level]--;
+ /* Nothing to do if the entry is a super-page. */
+ if ( level == 3 )
+ p2m_put_l3_page(entry);
+ return;
+ }
+
+ table = map_domain_page(lpae_get_mfn(entry));
+ for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
+ p2m_free_entry(p2m, *(table + i), level + 1);
+
+ unmap_domain_page(table);
+
+ /*
+ * Make sure all the references in the TLB have been removed before
+ * freing the intermediate page table.
+ * XXX: Should we defer the free of the page table to avoid the
+ * flush?
+ */
+ p2m_tlb_flush_sync(p2m);
+
+ mfn = lpae_get_mfn(entry);
+ ASSERT(mfn_valid(mfn));
+
+ pg = mfn_to_page(mfn);
+
+ page_list_del(pg, &p2m->pages);
+ p2m_free_page(p2m->domain, pg);
+}
+
+static bool p2m_split_superpage(struct p2m_domain *p2m, lpae_t *entry,
+ unsigned int level, unsigned int target,
+ const unsigned int *offsets)
+{
+ struct page_info *page;
+ unsigned int i;
+ lpae_t pte, *table;
+ bool rv = true;
+
+ /* Convenience aliases */
+ mfn_t mfn = lpae_get_mfn(*entry);
+ unsigned int next_level = level + 1;
+ unsigned int level_order = XEN_PT_LEVEL_ORDER(next_level);
+
+ /*
+ * This should only be called with target != level and the entry is
+ * a superpage.
+ */
+ ASSERT(level < target);
+ ASSERT(p2m_is_superpage(*entry, level));
+
+ page = p2m_alloc_page(p2m->domain);
+ if ( !page )
+ return false;
+
+ page_list_add(page, &p2m->pages);
+ table = __map_domain_page(page);
+
+ /*
+ * We are either splitting a first level 1G page into 512 second level
+ * 2M pages, or a second level 2M page into 512 third level 4K pages.
+ */
+ for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
+ {
+ lpae_t *new_entry = table + i;
+
+ /*
+ * Use the content of the superpage entry and override
+ * the necessary fields. So the correct permission are kept.
+ */
+ pte = *entry;
+ lpae_set_mfn(pte, mfn_add(mfn, i << level_order));
+
+ /*
+ * First and second level pages set p2m.table = 0, but third
+ * level entries set p2m.table = 1.
+ */
+ pte.p2m.table = (next_level == 3);
+
+ write_pte(new_entry, pte);
+ }
+
+ /* Update stats */
+ p2m->stats.shattered[level]++;
+ p2m->stats.mappings[level]--;
+ p2m->stats.mappings[next_level] += XEN_PT_LPAE_ENTRIES;
+
+ /*
+ * Shatter superpage in the page to the level we want to make the
+ * changes.
+ * This is done outside the loop to avoid checking the offset to
+ * know whether the entry should be shattered for every entry.
+ */
+ if ( next_level != target )
+ rv = p2m_split_superpage(p2m, table + offsets[next_level],
+ level + 1, target, offsets);
+
+ if ( p2m->clean_pte )
+ clean_dcache_va_range(table, PAGE_SIZE);
+
+ unmap_domain_page(table);
+
+ /*
+ * Even if we failed, we should install the newly allocated LPAE
+ * entry. The caller will be in charge to free the sub-tree.
+ */
+ p2m_write_pte(entry, page_to_p2m_table(page), p2m->clean_pte);
+
+ return rv;
+}
+
+/*
+ * Insert an entry in the p2m. This should be called with a mapping
+ * equal to a page/superpage (4K, 2M, 1G).
+ */
+static int __p2m_set_entry(struct p2m_domain *p2m,
+ gfn_t sgfn,
+ unsigned int page_order,
+ mfn_t smfn,
+ p2m_type_t t,
+ p2m_access_t a)
+{
+ unsigned int level = 0;
+ unsigned int target = 3 - (page_order / XEN_PT_LPAE_SHIFT);
+ lpae_t *entry, *table, orig_pte;
+ int rc;
+ /* A mapping is removed if the MFN is invalid. */
+ bool removing_mapping = mfn_eq(smfn, INVALID_MFN);
+ DECLARE_OFFSETS(offsets, gfn_to_gaddr(sgfn));
+
+ ASSERT(p2m_is_write_locked(p2m));
+
+ /*
+ * Check if the level target is valid: we only support
+ * 4K - 2M - 1G mapping.
+ */
+ ASSERT(target > 0 && target <= 3);
+
+ table = p2m_get_root_pointer(p2m, sgfn);
+ if ( !table )
+ return -EINVAL;
+
+ for ( level = P2M_ROOT_LEVEL; level < target; level++ )
+ {
+ /*
+ * Don't try to allocate intermediate page table if the mapping
+ * is about to be removed.
+ */
+ rc = p2m_next_level(p2m, removing_mapping,
+ level, &table, offsets[level]);
+ if ( rc == GUEST_TABLE_MAP_FAILED )
+ {
+ /*
+ * We are here because p2m_next_level has failed to map
+ * the intermediate page table (e.g the table does not exist
+ * and they p2m tree is read-only). It is a valid case
+ * when removing a mapping as it may not exist in the
+ * page table. In this case, just ignore it.
+ */
+ rc = removing_mapping ? 0 : -ENOENT;
+ goto out;
+ }
+ else if ( rc != GUEST_TABLE_NORMAL_PAGE )
+ break;
+ }
+
+ entry = table + offsets[level];
+
+ /*
+ * If we are here with level < target, we must be at a leaf node,
+ * and we need to break up the superpage.
+ */
+ if ( level < target )
+ {
+ /* We need to split the original page. */
+ lpae_t split_pte = *entry;
+
+ ASSERT(p2m_is_superpage(*entry, level));
+
+ if ( !p2m_split_superpage(p2m, &split_pte, level, target, offsets) )
+ {
+ /*
+ * The current super-page is still in-place, so re-increment
+ * the stats.
+ */
+ p2m->stats.mappings[level]++;
+
+ /* Free the allocated sub-tree */
+ p2m_free_entry(p2m, split_pte, level);
+
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Follow the break-before-sequence to update the entry.
+ * For more details see (D4.7.1 in ARM DDI 0487A.j).
+ */
+ p2m_remove_pte(entry, p2m->clean_pte);
+ p2m_force_tlb_flush_sync(p2m);
+
+ p2m_write_pte(entry, split_pte, p2m->clean_pte);
+
+ /* then move to the level we want to make real changes */
+ for ( ; level < target; level++ )
+ {
+ rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
+
+ /*
+ * The entry should be found and either be a table
+ * or a superpage if level 3 is not targeted
+ */
+ ASSERT(rc == GUEST_TABLE_NORMAL_PAGE ||
+ (rc == GUEST_TABLE_SUPER_PAGE && target < 3));
+ }
+
+ entry = table + offsets[level];
+ }
+
+ /*
+ * We should always be there with the correct level because
+ * all the intermediate tables have been installed if necessary.
+ */
+ ASSERT(level == target);
+
+ orig_pte = *entry;
+
+ /*
+ * The radix-tree can only work on 4KB. This is only used when
+ * memaccess is enabled and during shutdown.
+ */
+ ASSERT(!p2m->mem_access_enabled || page_order == 0 ||
+ p2m->domain->is_dying);
+ /*
+ * The access type should always be p2m_access_rwx when the mapping
+ * is removed.
+ */
+ ASSERT(!mfn_eq(INVALID_MFN, smfn) || (a == p2m_access_rwx));
+ /*
+ * Update the mem access permission before update the P2M. So we
+ * don't have to revert the mapping if it has failed.
+ */
+ rc = p2m_mem_access_radix_set(p2m, sgfn, a);
+ if ( rc )
+ goto out;
+
+ /*
+ * Always remove the entry in order to follow the break-before-make
+ * sequence when updating the translation table (D4.7.1 in ARM DDI
+ * 0487A.j).
+ */
+ if ( lpae_is_valid(orig_pte) || removing_mapping )
+ p2m_remove_pte(entry, p2m->clean_pte);
+
+ if ( removing_mapping )
+ /* Flush can be deferred if the entry is removed */
+ p2m->need_flush |= !!lpae_is_valid(orig_pte);
+ else
+ {
+ lpae_t pte = mfn_to_p2m_entry(smfn, t, a);
+
+ if ( level < 3 )
+ pte.p2m.table = 0; /* Superpage entry */
+
+ /*
+ * It is necessary to flush the TLB before writing the new entry
+ * to keep coherency when the previous entry was valid.
+ *
+ * Although, it could be defered when only the permissions are
+ * changed (e.g in case of memaccess).
+ */
+ if ( lpae_is_valid(orig_pte) )
+ {
+ if ( likely(!p2m->mem_access_enabled) ||
+ P2M_CLEAR_PERM(pte) != P2M_CLEAR_PERM(orig_pte) )
+ p2m_force_tlb_flush_sync(p2m);
+ else
+ p2m->need_flush = true;
+ }
+ else if ( !p2m_is_valid(orig_pte) ) /* new mapping */
+ p2m->stats.mappings[level]++;
+
+ p2m_write_pte(entry, pte, p2m->clean_pte);
+
+ p2m->max_mapped_gfn = gfn_max(p2m->max_mapped_gfn,
+ gfn_add(sgfn, (1UL << page_order) - 1));
+ p2m->lowest_mapped_gfn = gfn_min(p2m->lowest_mapped_gfn, sgfn);
+ }
+
+ if ( is_iommu_enabled(p2m->domain) &&
+ (lpae_is_valid(orig_pte) || lpae_is_valid(*entry)) )
+ {
+ unsigned int flush_flags = 0;
+
+ if ( lpae_is_valid(orig_pte) )
+ flush_flags |= IOMMU_FLUSHF_modified;
+ if ( lpae_is_valid(*entry) )
+ flush_flags |= IOMMU_FLUSHF_added;
+
+ rc = iommu_iotlb_flush(p2m->domain, _dfn(gfn_x(sgfn)),
+ 1UL << page_order, flush_flags);
+ }
+ else
+ rc = 0;
+
+ /*
+ * Free the entry only if the original pte was valid and the base
+ * is different (to avoid freeing when permission is changed).
+ */
+ if ( p2m_is_valid(orig_pte) &&
+ !mfn_eq(lpae_get_mfn(*entry), lpae_get_mfn(orig_pte)) )
+ p2m_free_entry(p2m, orig_pte, level);
+
+out:
+ unmap_domain_page(table);
+
+ return rc;
+}
+
+int p2m_set_entry(struct p2m_domain *p2m,
+ gfn_t sgfn,
+ unsigned long nr,
+ mfn_t smfn,
+ p2m_type_t t,
+ p2m_access_t a)
+{
+ int rc = 0;
+
+ /*
+ * Any reference taken by the P2M mappings (e.g. foreign mapping) will
+ * be dropped in relinquish_p2m_mapping(). As the P2M will still
+ * be accessible after, we need to prevent mapping to be added when the
+ * domain is dying.
+ */
+ if ( unlikely(p2m->domain->is_dying) )
+ return -ENOMEM;
+
+ while ( nr )
+ {
+ unsigned long mask;
+ unsigned long order;
+
+ /*
+ * Don't take into account the MFN when removing mapping (i.e
+ * MFN_INVALID) to calculate the correct target order.
+ *
+ * XXX: Support superpage mappings if nr is not aligned to a
+ * superpage size.
+ */
+ mask = !mfn_eq(smfn, INVALID_MFN) ? mfn_x(smfn) : 0;
+ mask |= gfn_x(sgfn) | nr;
+
+ /* Always map 4k by 4k when memaccess is enabled */
+ if ( unlikely(p2m->mem_access_enabled) )
+ order = THIRD_ORDER;
+ else if ( !(mask & ((1UL << FIRST_ORDER) - 1)) )
+ order = FIRST_ORDER;
+ else if ( !(mask & ((1UL << SECOND_ORDER) - 1)) )
+ order = SECOND_ORDER;
+ else
+ order = THIRD_ORDER;
+
+ rc = __p2m_set_entry(p2m, sgfn, order, smfn, t, a);
+ if ( rc )
+ break;
+
+ sgfn = gfn_add(sgfn, (1 << order));
+ if ( !mfn_eq(smfn, INVALID_MFN) )
+ smfn = mfn_add(smfn, (1 << order));
+
+ nr -= (1 << order);
+ }
+
+ return rc;
+}
+
+/* Invalidate all entries in the table. The p2m should be write locked. */
+static void p2m_invalidate_table(struct p2m_domain *p2m, mfn_t mfn)
+{
+ lpae_t *table;
+ unsigned int i;
+
+ ASSERT(p2m_is_write_locked(p2m));
+
+ table = map_domain_page(mfn);
+
+ for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
+ {
+ lpae_t pte = table[i];
+
+ /*
+ * Writing an entry can be expensive because it may involve
+ * cleaning the cache. So avoid updating the entry if the valid
+ * bit is already cleared.
+ */
+ if ( !pte.p2m.valid )
+ continue;
+
+ pte.p2m.valid = 0;
+
+ p2m_write_pte(&table[i], pte, p2m->clean_pte);
+ }
+
+ unmap_domain_page(table);
+
+ p2m->need_flush = true;
+}
+
+/*
+ * The domain will not be scheduled anymore, so in theory we should
+ * not need to flush the TLBs. Do it for safety purpose.
+ * Note that all the devices have already been de-assigned. So we don't
+ * need to flush the IOMMU TLB here.
+ */
+void p2m_clear_root_pages(struct p2m_domain *p2m)
+{
+ unsigned int i;
+
+ p2m_write_lock(p2m);
+
+ for ( i = 0; i < P2M_ROOT_PAGES; i++ )
+ clear_and_clean_page(p2m->root + i);
+
+ p2m_force_tlb_flush_sync(p2m);
+
+ p2m_write_unlock(p2m);
+}
+
+/*
+ * Invalidate all entries in the root page-tables. This is
+ * useful to get fault on entry and do an action.
+ *
+ * p2m_invalid_root() should not be called when the P2M is shared with
+ * the IOMMU because it will cause IOMMU fault.
+ */
+static void p2m_invalidate_root(struct p2m_domain *p2m)
+{
+ unsigned int i;
+
+ ASSERT(!iommu_use_hap_pt(p2m->domain));
+
+ p2m_write_lock(p2m);
+
+ for ( i = 0; i < P2M_ROOT_LEVEL; i++ )
+ p2m_invalidate_table(p2m, page_to_mfn(p2m->root + i));
+
+ p2m_write_unlock(p2m);
+}
+
+void p2m_domain_creation_finished(struct domain *d)
+{
+ /*
+ * To avoid flushing the whole guest RAM on the first Set/Way, we
+ * invalidate the P2M to track what has been accessed.
+ *
+ * This is only turned when IOMMU is not used or the page-table are
+ * not shared because bit[0] (e.g valid bit) unset will result
+ * IOMMU fault that could be not fixed-up.
+ */
+ if ( !iommu_use_hap_pt(d) )
+ p2m_invalidate_root(p2m_get_hostp2m(d));
+}
+
+/*
+ * Resolve any translation fault due to change in the p2m. This
+ * includes break-before-make and valid bit cleared.
+ */
+bool p2m_resolve_translation_fault(struct domain *d, gfn_t gfn)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+ unsigned int level = 0;
+ bool resolved = false;
+ lpae_t entry, *table;
+
+ /* Convenience aliases */
+ DECLARE_OFFSETS(offsets, gfn_to_gaddr(gfn));
+
+ p2m_write_lock(p2m);
+
+ /* This gfn is higher than the highest the p2m map currently holds */
+ if ( gfn_x(gfn) > gfn_x(p2m->max_mapped_gfn) )
+ goto out;
+
+ table = p2m_get_root_pointer(p2m, gfn);
+ /*
+ * The table should always be non-NULL because the gfn is below
+ * p2m->max_mapped_gfn and the root table pages are always present.
+ */
+ if ( !table )
+ {
+ ASSERT_UNREACHABLE();
+ goto out;
+ }
+
+ /*
+ * Go down the page-tables until an entry has the valid bit unset or
+ * a block/page entry has been hit.
+ */
+ for ( level = P2M_ROOT_LEVEL; level <= 3; level++ )
+ {
+ int rc;
+
+ entry = table[offsets[level]];
+
+ if ( level == 3 )
+ break;
+
+ /* Stop as soon as we hit an entry with the valid bit unset. */
+ if ( !lpae_is_valid(entry) )
+ break;
+
+ rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
+ if ( rc == GUEST_TABLE_MAP_FAILED )
+ goto out_unmap;
+ else if ( rc != GUEST_TABLE_NORMAL_PAGE )
+ break;
+ }
+
+ /*
+ * If the valid bit of the entry is set, it means someone was playing with
+ * the Stage-2 page table. Nothing to do and mark the fault as resolved.
+ */
+ if ( lpae_is_valid(entry) )
+ {
+ resolved = true;
+ goto out_unmap;
+ }
+
+ /*
+ * The valid bit is unset. If the entry is still not valid then the fault
+ * cannot be resolved, exit and report it.
+ */
+ if ( !p2m_is_valid(entry) )
+ goto out_unmap;
+
+ /*
+ * Now we have an entry with valid bit unset, but still valid from
+ * the P2M point of view.
+ *
+ * If an entry is pointing to a table, each entry of the table will
+ * have there valid bit cleared. This allows a function to clear the
+ * full p2m with just a couple of write. The valid bit will then be
+ * propagated on the fault.
+ * If an entry is pointing to a block/page, no work to do for now.
+ */
+ if ( lpae_is_table(entry, level) )
+ p2m_invalidate_table(p2m, lpae_get_mfn(entry));
+
+ /*
+ * Now that the work on the entry is done, set the valid bit to prevent
+ * another fault on that entry.
+ */
+ resolved = true;
+ entry.p2m.valid = 1;
+
+ p2m_write_pte(table + offsets[level], entry, p2m->clean_pte);
+
+ /*
+ * No need to flush the TLBs as the modified entry had the valid bit
+ * unset.
+ */
+
+out_unmap:
+ unmap_domain_page(table);
+
+out:
+ p2m_write_unlock(p2m);
+
+ return resolved;
+}
+
+static struct page_info *p2m_allocate_root(void)
+{
+ struct page_info *page;
+ unsigned int i;
+
+ page = alloc_domheap_pages(NULL, P2M_ROOT_ORDER, 0);
+ if ( page == NULL )
+ return NULL;
+
+ /* Clear both first level pages */
+ for ( i = 0; i < P2M_ROOT_PAGES; i++ )
+ clear_and_clean_page(page + i);
+
+ return page;
+}
+
+static int p2m_alloc_table(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+
+ p2m->root = p2m_allocate_root();
+ if ( !p2m->root )
+ return -ENOMEM;
+
+ p2m->vttbr = generate_vttbr(p2m->vmid, page_to_mfn(p2m->root));
+
+ /*
+ * Make sure that all TLBs corresponding to the new VMID are flushed
+ * before using it
+ */
+ p2m_write_lock(p2m);
+ p2m_force_tlb_flush_sync(p2m);
+ p2m_write_unlock(p2m);
+
+ return 0;
+}
+
+int p2m_teardown(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+ unsigned long count = 0;
+ struct page_info *pg;
+ int rc = 0;
+
+ p2m_write_lock(p2m);
+
+ while ( (pg = page_list_remove_head(&p2m->pages)) )
+ {
+ p2m_free_page(p2m->domain, pg);
+ count++;
+ /* Arbitrarily preempt every 512 iterations */
+ if ( !(count % 512) && hypercall_preempt_check() )
+ {
+ rc = -ERESTART;
+ break;
+ }
+ }
+
+ p2m_write_unlock(p2m);
+
+ return rc;
+}
+
+void p2m_final_teardown(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+
+ /* p2m not actually initialized */
+ if ( !p2m->domain )
+ return;
+
+ /*
+ * No need to call relinquish_p2m_mapping() here because
+ * p2m_final_teardown() is called either after domain_relinquish_resources()
+ * where relinquish_p2m_mapping() has been called.
+ */
+
+ ASSERT(page_list_empty(&p2m->pages));
+
+ while ( p2m_teardown_allocation(d) == -ERESTART )
+ continue; /* No preemption support here */
+ ASSERT(page_list_empty(&d->arch.paging.p2m_freelist));
+
+ if ( p2m->root )
+ free_domheap_pages(p2m->root, P2M_ROOT_ORDER);
+
+ p2m->root = NULL;
+
+ p2m_free_vmid(d);
+
+ radix_tree_destroy(&p2m->mem_access_settings, NULL);
+
+ p2m->domain = NULL;
+}
+
+int p2m_init(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+ int rc;
+ unsigned int cpu;
+
+ rwlock_init(&p2m->lock);
+ spin_lock_init(&d->arch.paging.lock);
+ INIT_PAGE_LIST_HEAD(&p2m->pages);
+ INIT_PAGE_LIST_HEAD(&d->arch.paging.p2m_freelist);
+
+ p2m->vmid = INVALID_VMID;
+ p2m->max_mapped_gfn = _gfn(0);
+ p2m->lowest_mapped_gfn = _gfn(ULONG_MAX);
+
+ p2m->default_access = p2m_access_rwx;
+ p2m->mem_access_enabled = false;
+ radix_tree_init(&p2m->mem_access_settings);
+
+ /*
+ * Some IOMMUs don't support coherent PT walk. When the p2m is
+ * shared with the CPU, Xen has to make sure that the PT changes have
+ * reached the memory
+ */
+ p2m->clean_pte = is_iommu_enabled(d) &&
+ !iommu_has_feature(d, IOMMU_FEAT_COHERENT_WALK);
+
+ /*
+ * Make sure that the type chosen to is able to store the an vCPU ID
+ * between 0 and the maximum of virtual CPUS supported as long as
+ * the INVALID_VCPU_ID.
+ */
+ BUILD_BUG_ON((1 << (sizeof(p2m->last_vcpu_ran[0]) * 8)) < MAX_VIRT_CPUS);
+ BUILD_BUG_ON((1 << (sizeof(p2m->last_vcpu_ran[0])* 8)) < INVALID_VCPU_ID);
+
+ for_each_possible_cpu(cpu)
+ p2m->last_vcpu_ran[cpu] = INVALID_VCPU_ID;
+
+ /*
+ * "Trivial" initialisation is now complete. Set the backpointer so
+ * p2m_teardown() and friends know to do something.
+ */
+ p2m->domain = d;
+
+ rc = p2m_alloc_vmid(d);
+ if ( rc )
+ return rc;
+
+ rc = p2m_alloc_table(d);
+ if ( rc )
+ return rc;
+
+ return 0;
+}
+
+/*
+ * The function will go through the p2m and remove page reference when it
+ * is required. The mapping will be removed from the p2m.
+ *
+ * XXX: See whether the mapping can be left intact in the p2m.
+ */
+int relinquish_p2m_mapping(struct domain *d)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
+ unsigned long count = 0;
+ p2m_type_t t;
+ int rc = 0;
+ unsigned int order;
+ gfn_t start, end;
+
+ BUG_ON(!d->is_dying);
+ /* No mappings can be added in the P2M after the P2M lock is released. */
+ p2m_write_lock(p2m);
+
+ start = p2m->lowest_mapped_gfn;
+ end = gfn_add(p2m->max_mapped_gfn, 1);
+
+ for ( ; gfn_x(start) < gfn_x(end);
+ start = gfn_next_boundary(start, order) )
+ {
+ mfn_t mfn = p2m_get_entry(p2m, start, &t, NULL, &order, NULL);
+
+ count++;
+ /*
+ * Arbitrarily preempt every 512 iterations.
+ */
+ if ( !(count % 512) && hypercall_preempt_check() )
+ {
+ rc = -ERESTART;
+ break;
+ }
+
+ /*
+ * p2m_set_entry will take care of removing reference on page
+ * when it is necessary and removing the mapping in the p2m.
+ */
+ if ( !mfn_eq(mfn, INVALID_MFN) )
+ {
+ /*
+ * For valid mapping, the start will always be aligned as
+ * entry will be removed whilst relinquishing.
+ */
+ rc = __p2m_set_entry(p2m, start, order, INVALID_MFN,
+ p2m_invalid, p2m_access_rwx);
+ if ( unlikely(rc) )
+ {
+ printk(XENLOG_G_ERR "Unable to remove mapping gfn=%#"PRI_gfn" order=%u from the p2m of domain %d\n", gfn_x(start), order, d->domain_id);
+ break;
+ }
+ }
+ }
+
+ /*
+ * Update lowest_mapped_gfn so on the next call we still start where
+ * we stopped.
+ */
+ p2m->lowest_mapped_gfn = start;
+
+ p2m_write_unlock(p2m);
+
+ return rc;
+}
+
+/*
+ * Clean & invalidate RAM associated to the guest vCPU.
+ *
+ * The function can only work with the current vCPU and should be called
+ * with IRQ enabled as the vCPU could get preempted.
+ */
+void p2m_flush_vm(struct vcpu *v)
+{
+ struct p2m_domain *p2m = p2m_get_hostp2m(v->domain);
+ int rc;
+ gfn_t start = _gfn(0);
+
+ ASSERT(v == current);
+ ASSERT(local_irq_is_enabled());
+ ASSERT(v->arch.need_flush_to_ram);
+
+ do
+ {
+ rc = p2m_cache_flush_range(v->domain, &start, _gfn(ULONG_MAX));
+ if ( rc == -ERESTART )
+ do_softirq();
+ } while ( rc == -ERESTART );
+
+ if ( rc != 0 )
+ gprintk(XENLOG_WARNING,
+ "P2M has not been correctly cleaned (rc = %d)\n",
+ rc);
+
+ /*
+ * Invalidate the p2m to track which page was modified by the guest
+ * between call of p2m_flush_vm().
+ */
+ p2m_invalidate_root(p2m);
+
+ v->arch.need_flush_to_ram = false;
+}
+
+/* VTCR value to be configured by all CPUs. Set only once by the boot CPU */
+static register_t __read_mostly vtcr;
+
+static void setup_virt_paging_one(void *data)
+{
+ WRITE_SYSREG(vtcr, VTCR_EL2);
+
+ /*
+ * ARM64_WORKAROUND_AT_SPECULATE: We want to keep the TLBs free from
+ * entries related to EL1/EL0 translation regime until a guest vCPU
+ * is running. For that, we need to set-up VTTBR to point to an empty
+ * page-table and turn on stage-2 translation. The TLB entries
+ * associated with EL1/EL0 translation regime will also be flushed in case
+ * an AT instruction was speculated before hand.
+ */
+ if ( cpus_have_cap(ARM64_WORKAROUND_AT_SPECULATE) )
+ {
+ WRITE_SYSREG64(generate_vttbr(INVALID_VMID, empty_root_mfn), VTTBR_EL2);
+ WRITE_SYSREG(READ_SYSREG(HCR_EL2) | HCR_VM, HCR_EL2);
+ isb();
+
+ flush_all_guests_tlb_local();
+ }
+}
+
+void __init setup_virt_paging(void)
+{
+ /* Setup Stage 2 address translation */
+ register_t val = VTCR_RES1|VTCR_SH0_IS|VTCR_ORGN0_WBWA|VTCR_IRGN0_WBWA;
+
+ static const struct {
+ unsigned int pabits; /* Physical Address Size */
+ unsigned int t0sz; /* Desired T0SZ, minimum in comment */
+ unsigned int root_order; /* Page order of the root of the p2m */
+ unsigned int sl0; /* Desired SL0, maximum in comment */
+ } pa_range_info[] __initconst = {
+ /* T0SZ minimum and SL0 maximum from ARM DDI 0487H.a Table D5-6 */
+ /* PA size, t0sz(min), root-order, sl0(max) */
+#ifdef CONFIG_ARM_64
+ [0] = { 32, 32/*32*/, 0, 1 },
+ [1] = { 36, 28/*28*/, 0, 1 },
+ [2] = { 40, 24/*24*/, 1, 1 },
+ [3] = { 42, 22/*22*/, 3, 1 },
+ [4] = { 44, 20/*20*/, 0, 2 },
+ [5] = { 48, 16/*16*/, 0, 2 },
+ [6] = { 52, 12/*12*/, 4, 2 },
+ [7] = { 0 } /* Invalid */
+#else
+ { 32, 0/*0*/, 0, 1 },
+ { 40, 24/*24*/, 1, 1 }
+#endif
+ };
+
+ unsigned int i;
+ unsigned int pa_range = 0x10; /* Larger than any possible value */
+
+#ifdef CONFIG_ARM_32
+ /*
+ * Typecast pa_range_info[].t0sz into arm32 bit variant.
+ *
+ * VTCR.T0SZ is bits [3:0] and S(sign extension), bit[4] for arm322.
+ * Thus, pa_range_info[].t0sz is translated to its arm32 variant using
+ * struct bitfields.
+ */
+ struct
+ {
+ signed int val:5;
+ } t0sz_32;
+#else
+ /*
+ * Restrict "p2m_ipa_bits" if needed. As P2M table is always configured
+ * with IPA bits == PA bits, compare against "pabits".
+ */
+ if ( pa_range_info[system_cpuinfo.mm64.pa_range].pabits < p2m_ipa_bits )
+ p2m_ipa_bits = pa_range_info[system_cpuinfo.mm64.pa_range].pabits;
+
+ /*
+ * cpu info sanitization made sure we support 16bits VMID only if all
+ * cores are supporting it.
+ */
+ if ( system_cpuinfo.mm64.vmid_bits == MM64_VMID_16_BITS_SUPPORT )
+ max_vmid = MAX_VMID_16_BIT;
+#endif
+
+ /* Choose suitable "pa_range" according to the resulted "p2m_ipa_bits". */
+ for ( i = 0; i < ARRAY_SIZE(pa_range_info); i++ )
+ {
+ if ( p2m_ipa_bits == pa_range_info[i].pabits )
+ {
+ pa_range = i;
+ break;
+ }
+ }
+
+ /* Check if we found the associated entry in the array */
+ if ( pa_range >= ARRAY_SIZE(pa_range_info) || !pa_range_info[pa_range].pabits )
+ panic("%u-bit P2M is not supported\n", p2m_ipa_bits);
+
+#ifdef CONFIG_ARM_64
+ val |= VTCR_PS(pa_range);
+ val |= VTCR_TG0_4K;
+
+ /* Set the VS bit only if 16 bit VMID is supported. */
+ if ( MAX_VMID == MAX_VMID_16_BIT )
+ val |= VTCR_VS;
+#endif
+
+ val |= VTCR_SL0(pa_range_info[pa_range].sl0);
+ val |= VTCR_T0SZ(pa_range_info[pa_range].t0sz);
+
+ p2m_root_order = pa_range_info[pa_range].root_order;
+ p2m_root_level = 2 - pa_range_info[pa_range].sl0;
+
+#ifdef CONFIG_ARM_64
+ p2m_ipa_bits = 64 - pa_range_info[pa_range].t0sz;
+#else
+ t0sz_32.val = pa_range_info[pa_range].t0sz;
+ p2m_ipa_bits = 32 - t0sz_32.val;
+#endif
+
+ printk("P2M: %d-bit IPA with %d-bit PA and %d-bit VMID\n",
+ p2m_ipa_bits,
+ pa_range_info[pa_range].pabits,
+ ( MAX_VMID == MAX_VMID_16_BIT ) ? 16 : 8);
+
+ printk("P2M: %d levels with order-%d root, VTCR 0x%"PRIregister"\n",
+ 4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, val);
+
+ p2m_vmid_allocator_init();
+
+ /* It is not allowed to concatenate a level zero root */
+ BUG_ON( P2M_ROOT_LEVEL == 0 && P2M_ROOT_ORDER > 0 );
+ vtcr = val;
+
+ /*
+ * ARM64_WORKAROUND_AT_SPECULATE requires to allocate root table
+ * with all entries zeroed.
+ */
+ if ( cpus_have_cap(ARM64_WORKAROUND_AT_SPECULATE) )
+ {
+ struct page_info *root;
+
+ root = p2m_allocate_root();
+ if ( !root )
+ panic("Unable to allocate root table for ARM64_WORKAROUND_AT_SPECULATE\n");
+
+ empty_root_mfn = page_to_mfn(root);
+ }
+
+ setup_virt_paging_one(NULL);
+ smp_call_function(setup_virt_paging_one, NULL, 1);
+}
+
+static int cpu_virt_paging_callback(struct notifier_block *nfb,
+ unsigned long action,
+ void *hcpu)
+{
+ switch ( action )
+ {
+ case CPU_STARTING:
+ ASSERT(system_state != SYS_STATE_boot);
+ setup_virt_paging_one(NULL);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cpu_virt_paging_nfb = {
+ .notifier_call = cpu_virt_paging_callback,
+};
+
+static int __init cpu_virt_paging_init(void)
+{
+ register_cpu_notifier(&cpu_virt_paging_nfb);
+
+ return 0;
+}
+/*
+ * Initialization of the notifier has to be done at init rather than presmp_init
+ * phase because: the registered notifier is used to setup virtual paging for
+ * non-boot CPUs after the initial virtual paging for all CPUs is already setup,
+ * i.e. when a non-boot CPU is hotplugged after the system has booted. In other
+ * words, the notifier should be registered after the virtual paging is
+ * initially setup (setup_virt_paging() is called from start_xen()). This is
+ * required because vtcr config value has to be set before a notifier can fire.
+ */
+__initcall(cpu_virt_paging_init);
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index de32a2d638..b991b76ce4 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1,191 +1,25 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#include <xen/cpu.h>
-#include <xen/domain_page.h>
#include <xen/iocap.h>
-#include <xen/ioreq.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/softirq.h>
-#include <asm/alternative.h>
#include <asm/event.h>
#include <asm/flushtlb.h>
#include <asm/guest_walk.h>
#include <asm/page.h>
#include <asm/traps.h>
-#define MAX_VMID_8_BIT (1UL << 8)
-#define MAX_VMID_16_BIT (1UL << 16)
-
-#define INVALID_VMID 0 /* VMID 0 is reserved */
-
-unsigned int __read_mostly p2m_root_order;
-unsigned int __read_mostly p2m_root_level;
#ifdef CONFIG_ARM_64
-static unsigned int __read_mostly max_vmid = MAX_VMID_8_BIT;
-/* VMID is by default 8 bit width on AArch64 */
-#define MAX_VMID max_vmid
-#else
-/* VMID is always 8 bit width on AArch32 */
-#define MAX_VMID MAX_VMID_8_BIT
+unsigned int __read_mostly max_vmid = MAX_VMID_8_BIT;
#endif
-#define P2M_ROOT_PAGES (1<<P2M_ROOT_ORDER)
-
/*
* Set to the maximum configured support for IPA bits, so the number of IPA bits can be
* restricted by external entity (e.g. IOMMU).
*/
unsigned int __read_mostly p2m_ipa_bits = PADDR_BITS;
-static mfn_t __read_mostly empty_root_mfn;
-
-static uint64_t generate_vttbr(uint16_t vmid, mfn_t root_mfn)
-{
- return (mfn_to_maddr(root_mfn) | ((uint64_t)vmid << 48));
-}
-
-static struct page_info *p2m_alloc_page(struct domain *d)
-{
- struct page_info *pg;
-
- /*
- * For hardware domain, there should be no limit in the number of pages that
- * can be allocated, so that the kernel may take advantage of the extended
- * regions. Hence, allocate p2m pages for hardware domains from heap.
- */
- if ( is_hardware_domain(d) )
- {
- pg = alloc_domheap_page(NULL, 0);
- if ( pg == NULL )
- printk(XENLOG_G_ERR "Failed to allocate P2M pages for hwdom.\n");
- }
- else
- {
- spin_lock(&d->arch.paging.lock);
- pg = page_list_remove_head(&d->arch.paging.p2m_freelist);
- spin_unlock(&d->arch.paging.lock);
- }
-
- return pg;
-}
-
-static void p2m_free_page(struct domain *d, struct page_info *pg)
-{
- if ( is_hardware_domain(d) )
- free_domheap_page(pg);
- else
- {
- spin_lock(&d->arch.paging.lock);
- page_list_add_tail(pg, &d->arch.paging.p2m_freelist);
- spin_unlock(&d->arch.paging.lock);
- }
-}
-
-/* Return the size of the pool, in bytes. */
-int arch_get_paging_mempool_size(struct domain *d, uint64_t *size)
-{
- *size = (uint64_t)ACCESS_ONCE(d->arch.paging.p2m_total_pages) << PAGE_SHIFT;
- return 0;
-}
-
-/*
- * Set the pool of pages to the required number of pages.
- * Returns 0 for success, non-zero for failure.
- * Call with d->arch.paging.lock held.
- */
-int p2m_set_allocation(struct domain *d, unsigned long pages, bool *preempted)
-{
- struct page_info *pg;
-
- ASSERT(spin_is_locked(&d->arch.paging.lock));
-
- for ( ; ; )
- {
- if ( d->arch.paging.p2m_total_pages < pages )
- {
- /* Need to allocate more memory from domheap */
- pg = alloc_domheap_page(NULL, 0);
- if ( pg == NULL )
- {
- printk(XENLOG_ERR "Failed to allocate P2M pages.\n");
- return -ENOMEM;
- }
- ACCESS_ONCE(d->arch.paging.p2m_total_pages) =
- d->arch.paging.p2m_total_pages + 1;
- page_list_add_tail(pg, &d->arch.paging.p2m_freelist);
- }
- else if ( d->arch.paging.p2m_total_pages > pages )
- {
- /* Need to return memory to domheap */
- pg = page_list_remove_head(&d->arch.paging.p2m_freelist);
- if( pg )
- {
- ACCESS_ONCE(d->arch.paging.p2m_total_pages) =
- d->arch.paging.p2m_total_pages - 1;
- free_domheap_page(pg);
- }
- else
- {
- printk(XENLOG_ERR
- "Failed to free P2M pages, P2M freelist is empty.\n");
- return -ENOMEM;
- }
- }
- else
- break;
-
- /* Check to see if we need to yield and try again */
- if ( preempted && general_preempt_check() )
- {
- *preempted = true;
- return -ERESTART;
- }
- }
-
- return 0;
-}
-
-int arch_set_paging_mempool_size(struct domain *d, uint64_t size)
-{
- unsigned long pages = size >> PAGE_SHIFT;
- bool preempted = false;
- int rc;
-
- if ( (size & ~PAGE_MASK) || /* Non page-sized request? */
- pages != (size >> PAGE_SHIFT) ) /* 32-bit overflow? */
- return -EINVAL;
-
- spin_lock(&d->arch.paging.lock);
- rc = p2m_set_allocation(d, pages, &preempted);
- spin_unlock(&d->arch.paging.lock);
-
- ASSERT(preempted == (rc == -ERESTART));
-
- return rc;
-}
-
-int p2m_teardown_allocation(struct domain *d)
-{
- int ret = 0;
- bool preempted = false;
-
- spin_lock(&d->arch.paging.lock);
- if ( d->arch.paging.p2m_total_pages != 0 )
- {
- ret = p2m_set_allocation(d, 0, &preempted);
- if ( preempted )
- {
- spin_unlock(&d->arch.paging.lock);
- return -ERESTART;
- }
- ASSERT(d->arch.paging.p2m_total_pages == 0);
- }
- spin_unlock(&d->arch.paging.lock);
-
- return ret;
-}
-
/* Unlock the flush and do a P2M TLB flush if necessary */
void p2m_write_unlock(struct p2m_domain *p2m)
{
@@ -199,1268 +33,66 @@ void p2m_write_unlock(struct p2m_domain *p2m)
write_unlock(&p2m->lock);
}
-void p2m_dump_info(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
-
- p2m_read_lock(p2m);
- printk("p2m mappings for domain %d (vmid %d):\n",
- d->domain_id, p2m->vmid);
- BUG_ON(p2m->stats.mappings[0] || p2m->stats.shattered[0]);
- printk(" 1G mappings: %ld (shattered %ld)\n",
- p2m->stats.mappings[1], p2m->stats.shattered[1]);
- printk(" 2M mappings: %ld (shattered %ld)\n",
- p2m->stats.mappings[2], p2m->stats.shattered[2]);
- printk(" 4K mappings: %ld\n", p2m->stats.mappings[3]);
- p2m_read_unlock(p2m);
-}
-
void memory_type_changed(struct domain *d)
{
}
-void dump_p2m_lookup(struct domain *d, paddr_t addr)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
-
- printk("dom%d IPA 0x%"PRIpaddr"\n", d->domain_id, addr);
-
- printk("P2M @ %p mfn:%#"PRI_mfn"\n",
- p2m->root, mfn_x(page_to_mfn(p2m->root)));
-
- dump_pt_walk(page_to_maddr(p2m->root), addr,
- P2M_ROOT_LEVEL, P2M_ROOT_PAGES);
-}
-
-/*
- * p2m_save_state and p2m_restore_state work in pair to workaround
- * ARM64_WORKAROUND_AT_SPECULATE. p2m_save_state will set-up VTTBR to
- * point to the empty page-tables to stop allocating TLB entries.
- */
-void p2m_save_state(struct vcpu *p)
-{
- p->arch.sctlr = READ_SYSREG(SCTLR_EL1);
-
- if ( cpus_have_const_cap(ARM64_WORKAROUND_AT_SPECULATE) )
- {
- WRITE_SYSREG64(generate_vttbr(INVALID_VMID, empty_root_mfn), VTTBR_EL2);
- /*
- * Ensure VTTBR_EL2 is correctly synchronized so we can restore
- * the next vCPU context without worrying about AT instruction
- * speculation.
- */
- isb();
- }
-}
-
-void p2m_restore_state(struct vcpu *n)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(n->domain);
- uint8_t *last_vcpu_ran;
-
- if ( is_idle_vcpu(n) )
- return;
-
- WRITE_SYSREG(n->arch.sctlr, SCTLR_EL1);
- WRITE_SYSREG(n->arch.hcr_el2, HCR_EL2);
-
- /*
- * ARM64_WORKAROUND_AT_SPECULATE: VTTBR_EL2 should be restored after all
- * registers associated to EL1/EL0 translations regime have been
- * synchronized.
- */
- asm volatile(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_AT_SPECULATE));
- WRITE_SYSREG64(p2m->vttbr, VTTBR_EL2);
-
- last_vcpu_ran = &p2m->last_vcpu_ran[smp_processor_id()];
-
- /*
- * While we are restoring an out-of-context translation regime
- * we still need to ensure:
- * - VTTBR_EL2 is synchronized before flushing the TLBs
- * - All registers for EL1 are synchronized before executing an AT
- * instructions targeting S1/S2.
- */
- isb();
-
- /*
- * Flush local TLB for the domain to prevent wrong TLB translation
- * when running multiple vCPU of the same domain on a single pCPU.
- */
- if ( *last_vcpu_ran != INVALID_VCPU_ID && *last_vcpu_ran != n->vcpu_id )
- flush_guest_tlb_local();
-
- *last_vcpu_ran = n->vcpu_id;
-}
-
-/*
- * Force a synchronous P2M TLB flush.
- *
- * Must be called with the p2m lock held.
- */
-static void p2m_force_tlb_flush_sync(struct p2m_domain *p2m)
-{
- unsigned long flags = 0;
- uint64_t ovttbr;
-
- ASSERT(p2m_is_write_locked(p2m));
-
- /*
- * ARM only provides an instruction to flush TLBs for the current
- * VMID. So switch to the VTTBR of a given P2M if different.
- */
- ovttbr = READ_SYSREG64(VTTBR_EL2);
- if ( ovttbr != p2m->vttbr )
- {
- uint64_t vttbr;
-
- local_irq_save(flags);
-
- /*
- * ARM64_WORKAROUND_AT_SPECULATE: We need to stop AT to allocate
- * TLBs entries because the context is partially modified. We
- * only need the VMID for flushing the TLBs, so we can generate
- * a new VTTBR with the VMID to flush and the empty root table.
- */
- if ( !cpus_have_const_cap(ARM64_WORKAROUND_AT_SPECULATE) )
- vttbr = p2m->vttbr;
- else
- vttbr = generate_vttbr(p2m->vmid, empty_root_mfn);
-
- WRITE_SYSREG64(vttbr, VTTBR_EL2);
-
- /* Ensure VTTBR_EL2 is synchronized before flushing the TLBs */
- isb();
- }
-
- flush_guest_tlb();
-
- if ( ovttbr != READ_SYSREG64(VTTBR_EL2) )
- {
- WRITE_SYSREG64(ovttbr, VTTBR_EL2);
- /* Ensure VTTBR_EL2 is back in place before continuing. */
- isb();
- local_irq_restore(flags);
- }
-
- p2m->need_flush = false;
-}
-
-void p2m_tlb_flush_sync(struct p2m_domain *p2m)
-{
- if ( p2m->need_flush )
- p2m_force_tlb_flush_sync(p2m);
-}
-
-/*
- * Find and map the root page table. The caller is responsible for
- * unmapping the table.
- *
- * The function will return NULL if the offset of the root table is
- * invalid.
- */
-static lpae_t *p2m_get_root_pointer(struct p2m_domain *p2m,
- gfn_t gfn)
-{
- unsigned long root_table;
-
- /*
- * While the root table index is the offset from the previous level,
- * we can't use (P2M_ROOT_LEVEL - 1) because the root level might be
- * 0. Yet we still want to check if all the unused bits are zeroed.
- */
- root_table = gfn_x(gfn) >> (XEN_PT_LEVEL_ORDER(P2M_ROOT_LEVEL) +
- XEN_PT_LPAE_SHIFT);
- if ( root_table >= P2M_ROOT_PAGES )
- return NULL;
-
- return __map_domain_page(p2m->root + root_table);
-}
-
-/*
- * Lookup the MFN corresponding to a domain's GFN.
- * Lookup mem access in the ratrix tree.
- * The entries associated to the GFN is considered valid.
- */
-static p2m_access_t p2m_mem_access_radix_get(struct p2m_domain *p2m, gfn_t gfn)
-{
- void *ptr;
-
- if ( !p2m->mem_access_enabled )
- return p2m->default_access;
-
- ptr = radix_tree_lookup(&p2m->mem_access_settings, gfn_x(gfn));
- if ( !ptr )
- return p2m_access_rwx;
- else
- return radix_tree_ptr_to_int(ptr);
-}
-
-/*
- * In the case of the P2M, the valid bit is used for other purpose. Use
- * the type to check whether an entry is valid.
- */
-static inline bool p2m_is_valid(lpae_t pte)
-{
- return pte.p2m.type != p2m_invalid;
-}
-
-/*
- * lpae_is_* helpers don't check whether the valid bit is set in the
- * PTE. Provide our own overlay to check the valid bit.
- */
-static inline bool p2m_is_mapping(lpae_t pte, unsigned int level)
-{
- return p2m_is_valid(pte) && lpae_is_mapping(pte, level);
-}
-
-static inline bool p2m_is_superpage(lpae_t pte, unsigned int level)
-{
- return p2m_is_valid(pte) && lpae_is_superpage(pte, level);
-}
-
-#define GUEST_TABLE_MAP_FAILED 0
-#define GUEST_TABLE_SUPER_PAGE 1
-#define GUEST_TABLE_NORMAL_PAGE 2
-
-static int p2m_create_table(struct p2m_domain *p2m, lpae_t *entry);
-
-/*
- * Take the currently mapped table, find the corresponding GFN entry,
- * and map the next table, if available. The previous table will be
- * unmapped if the next level was mapped (e.g GUEST_TABLE_NORMAL_PAGE
- * returned).
- *
- * The read_only parameters indicates whether intermediate tables should
- * be allocated when not present.
- *
- * Return values:
- * GUEST_TABLE_MAP_FAILED: Either read_only was set and the entry
- * was empty, or allocating a new page failed.
- * GUEST_TABLE_NORMAL_PAGE: next level mapped normally
- * GUEST_TABLE_SUPER_PAGE: The next entry points to a superpage.
- */
-static int p2m_next_level(struct p2m_domain *p2m, bool read_only,
- unsigned int level, lpae_t **table,
- unsigned int offset)
-{
- lpae_t *entry;
- int ret;
- mfn_t mfn;
-
- entry = *table + offset;
-
- if ( !p2m_is_valid(*entry) )
- {
- if ( read_only )
- return GUEST_TABLE_MAP_FAILED;
-
- ret = p2m_create_table(p2m, entry);
- if ( ret )
- return GUEST_TABLE_MAP_FAILED;
- }
-
- /* The function p2m_next_level is never called at the 3rd level */
- ASSERT(level < 3);
- if ( p2m_is_mapping(*entry, level) )
- return GUEST_TABLE_SUPER_PAGE;
-
- mfn = lpae_get_mfn(*entry);
-
- unmap_domain_page(*table);
- *table = map_domain_page(mfn);
-
- return GUEST_TABLE_NORMAL_PAGE;
-}
-
-/*
- * Get the details of a given gfn.
- *
- * If the entry is present, the associated MFN will be returned and the
- * access and type filled up. The page_order will correspond to the
- * order of the mapping in the page table (i.e it could be a superpage).
- *
- * If the entry is not present, INVALID_MFN will be returned and the
- * page_order will be set according to the order of the invalid range.
- *
- * valid will contain the value of bit[0] (e.g valid bit) of the
- * entry.
- */
-mfn_t p2m_get_entry(struct p2m_domain *p2m, gfn_t gfn,
- p2m_type_t *t, p2m_access_t *a,
- unsigned int *page_order,
- bool *valid)
-{
- paddr_t addr = gfn_to_gaddr(gfn);
- unsigned int level = 0;
- lpae_t entry, *table;
- int rc;
- mfn_t mfn = INVALID_MFN;
- p2m_type_t _t;
- DECLARE_OFFSETS(offsets, addr);
-
- ASSERT(p2m_is_locked(p2m));
- BUILD_BUG_ON(THIRD_MASK != PAGE_MASK);
-
- /* Allow t to be NULL */
- t = t ?: &_t;
-
- *t = p2m_invalid;
-
- if ( valid )
- *valid = false;
-
- /* XXX: Check if the mapping is lower than the mapped gfn */
-
- /* This gfn is higher than the highest the p2m map currently holds */
- if ( gfn_x(gfn) > gfn_x(p2m->max_mapped_gfn) )
- {
- for ( level = P2M_ROOT_LEVEL; level < 3; level++ )
- if ( (gfn_x(gfn) & (XEN_PT_LEVEL_MASK(level) >> PAGE_SHIFT)) >
- gfn_x(p2m->max_mapped_gfn) )
- break;
-
- goto out;
- }
-
- table = p2m_get_root_pointer(p2m, gfn);
-
- /*
- * the table should always be non-NULL because the gfn is below
- * p2m->max_mapped_gfn and the root table pages are always present.
- */
- if ( !table )
- {
- ASSERT_UNREACHABLE();
- level = P2M_ROOT_LEVEL;
- goto out;
- }
-
- for ( level = P2M_ROOT_LEVEL; level < 3; level++ )
- {
- rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
- if ( rc == GUEST_TABLE_MAP_FAILED )
- goto out_unmap;
- else if ( rc != GUEST_TABLE_NORMAL_PAGE )
- break;
- }
-
- entry = table[offsets[level]];
-
- if ( p2m_is_valid(entry) )
- {
- *t = entry.p2m.type;
-
- if ( a )
- *a = p2m_mem_access_radix_get(p2m, gfn);
-
- mfn = lpae_get_mfn(entry);
- /*
- * The entry may point to a superpage. Find the MFN associated
- * to the GFN.
- */
- mfn = mfn_add(mfn,
- gfn_x(gfn) & ((1UL << XEN_PT_LEVEL_ORDER(level)) - 1));
-
- if ( valid )
- *valid = lpae_is_valid(entry);
- }
-
-out_unmap:
- unmap_domain_page(table);
-
-out:
- if ( page_order )
- *page_order = XEN_PT_LEVEL_ORDER(level);
-
- return mfn;
-}
-
-mfn_t p2m_lookup(struct domain *d, gfn_t gfn, p2m_type_t *t)
-{
- mfn_t mfn;
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
-
- p2m_read_lock(p2m);
- mfn = p2m_get_entry(p2m, gfn, t, NULL, NULL, NULL);
- p2m_read_unlock(p2m);
-
- return mfn;
-}
-
-struct page_info *p2m_get_page_from_gfn(struct domain *d, gfn_t gfn,
- p2m_type_t *t)
-{
- struct page_info *page;
- p2m_type_t p2mt;
- mfn_t mfn = p2m_lookup(d, gfn, &p2mt);
-
- if ( t )
- *t = p2mt;
-
- if ( !p2m_is_any_ram(p2mt) )
- return NULL;
-
- if ( !mfn_valid(mfn) )
- return NULL;
-
- page = mfn_to_page(mfn);
-
- /*
- * get_page won't work on foreign mapping because the page doesn't
- * belong to the current domain.
- */
- if ( p2m_is_foreign(p2mt) )
- {
- struct domain *fdom = page_get_owner_and_reference(page);
- ASSERT(fdom != NULL);
- ASSERT(fdom != d);
- return page;
- }
-
- return get_page(page, d) ? page : NULL;
-}
-
-int guest_physmap_mark_populate_on_demand(struct domain *d,
- unsigned long gfn,
- unsigned int order)
-{
- return -ENOSYS;
-}
-
-unsigned long p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn,
- unsigned int order)
-{
- return 0;
-}
-
-static void p2m_set_permission(lpae_t *e, p2m_type_t t, p2m_access_t a)
-{
- /* First apply type permissions */
- switch ( t )
- {
- case p2m_ram_rw:
- e->p2m.xn = 0;
- e->p2m.write = 1;
- break;
-
- case p2m_ram_ro:
- e->p2m.xn = 0;
- e->p2m.write = 0;
- break;
-
- case p2m_iommu_map_rw:
- case p2m_map_foreign_rw:
- case p2m_grant_map_rw:
- case p2m_mmio_direct_dev:
- case p2m_mmio_direct_nc:
- case p2m_mmio_direct_c:
- e->p2m.xn = 1;
- e->p2m.write = 1;
- break;
-
- case p2m_iommu_map_ro:
- case p2m_map_foreign_ro:
- case p2m_grant_map_ro:
- case p2m_invalid:
- e->p2m.xn = 1;
- e->p2m.write = 0;
- break;
-
- case p2m_max_real_type:
- BUG();
- break;
- }
-
- /* Then restrict with access permissions */
- switch ( a )
- {
- case p2m_access_rwx:
- break;
- case p2m_access_wx:
- e->p2m.read = 0;
- break;
- case p2m_access_rw:
- e->p2m.xn = 1;
- break;
- case p2m_access_w:
- e->p2m.read = 0;
- e->p2m.xn = 1;
- break;
- case p2m_access_rx:
- case p2m_access_rx2rw:
- e->p2m.write = 0;
- break;
- case p2m_access_x:
- e->p2m.write = 0;
- e->p2m.read = 0;
- break;
- case p2m_access_r:
- e->p2m.write = 0;
- e->p2m.xn = 1;
- break;
- case p2m_access_n:
- case p2m_access_n2rwx:
- e->p2m.read = e->p2m.write = 0;
- e->p2m.xn = 1;
- break;
- }
-}
-
-static lpae_t mfn_to_p2m_entry(mfn_t mfn, p2m_type_t t, p2m_access_t a)
-{
- /*
- * sh, xn and write bit will be defined in the following switches
- * based on mattr and t.
- */
- lpae_t e = (lpae_t) {
- .p2m.af = 1,
- .p2m.read = 1,
- .p2m.table = 1,
- .p2m.valid = 1,
- .p2m.type = t,
- };
-
- BUILD_BUG_ON(p2m_max_real_type > (1 << 4));
-
- switch ( t )
- {
- case p2m_mmio_direct_dev:
- e.p2m.mattr = MATTR_DEV;
- e.p2m.sh = LPAE_SH_OUTER;
- break;
-
- case p2m_mmio_direct_c:
- e.p2m.mattr = MATTR_MEM;
- e.p2m.sh = LPAE_SH_OUTER;
- break;
-
- /*
- * ARM ARM: Overlaying the shareability attribute (DDI
- * 0406C.b B3-1376 to 1377)
- *
- * A memory region with a resultant memory type attribute of Normal,
- * and a resultant cacheability attribute of Inner Non-cacheable,
- * Outer Non-cacheable, must have a resultant shareability attribute
- * of Outer Shareable, otherwise shareability is UNPREDICTABLE.
- *
- * On ARMv8 shareability is ignored and explicitly treated as Outer
- * Shareable for Normal Inner Non_cacheable, Outer Non-cacheable.
- * See the note for table D4-40, in page 1788 of the ARM DDI 0487A.j.
- */
- case p2m_mmio_direct_nc:
- e.p2m.mattr = MATTR_MEM_NC;
- e.p2m.sh = LPAE_SH_OUTER;
- break;
-
- default:
- e.p2m.mattr = MATTR_MEM;
- e.p2m.sh = LPAE_SH_INNER;
- }
-
- p2m_set_permission(&e, t, a);
-
- ASSERT(!(mfn_to_maddr(mfn) & ~PADDR_MASK));
-
- lpae_set_mfn(e, mfn);
-
- return e;
-}
-
-/* Generate table entry with correct attributes. */
-static lpae_t page_to_p2m_table(struct page_info *page)
-{
- /*
- * The access value does not matter because the hardware will ignore
- * the permission fields for table entry.
- *
- * We use p2m_ram_rw so the entry has a valid type. This is important
- * for p2m_is_valid() to return valid on table entries.
- */
- return mfn_to_p2m_entry(page_to_mfn(page), p2m_ram_rw, p2m_access_rwx);
-}
-
-static inline void p2m_write_pte(lpae_t *p, lpae_t pte, bool clean_pte)
-{
- write_pte(p, pte);
- if ( clean_pte )
- clean_dcache(*p);
-}
-
-static inline void p2m_remove_pte(lpae_t *p, bool clean_pte)
-{
- lpae_t pte;
-
- memset(&pte, 0x00, sizeof(pte));
- p2m_write_pte(p, pte, clean_pte);
-}
-
-/* Allocate a new page table page and hook it in via the given entry. */
-static int p2m_create_table(struct p2m_domain *p2m, lpae_t *entry)
-{
- struct page_info *page;
- lpae_t *p;
-
- ASSERT(!p2m_is_valid(*entry));
-
- page = p2m_alloc_page(p2m->domain);
- if ( page == NULL )
- return -ENOMEM;
-
- page_list_add(page, &p2m->pages);
-
- p = __map_domain_page(page);
- clear_page(p);
-
- if ( p2m->clean_pte )
- clean_dcache_va_range(p, PAGE_SIZE);
-
- unmap_domain_page(p);
-
- p2m_write_pte(entry, page_to_p2m_table(page), p2m->clean_pte);
-
- return 0;
-}
-
-static int p2m_mem_access_radix_set(struct p2m_domain *p2m, gfn_t gfn,
- p2m_access_t a)
-{
- int rc;
-
- if ( !p2m->mem_access_enabled )
- return 0;
-
- if ( p2m_access_rwx == a )
- {
- radix_tree_delete(&p2m->mem_access_settings, gfn_x(gfn));
- return 0;
- }
-
- rc = radix_tree_insert(&p2m->mem_access_settings, gfn_x(gfn),
- radix_tree_int_to_ptr(a));
- if ( rc == -EEXIST )
- {
- /* If a setting already exists, change it to the new one */
- radix_tree_replace_slot(
- radix_tree_lookup_slot(
- &p2m->mem_access_settings, gfn_x(gfn)),
- radix_tree_int_to_ptr(a));
- rc = 0;
- }
-
- return rc;
-}
-
-/*
- * Put any references on the single 4K page referenced by pte.
- * TODO: Handle superpages, for now we only take special references for leaf
- * pages (specifically foreign ones, which can't be super mapped today).
- */
-static void p2m_put_l3_page(const lpae_t pte)
-{
- mfn_t mfn = lpae_get_mfn(pte);
-
- ASSERT(p2m_is_valid(pte));
-
- /*
- * TODO: Handle other p2m types
- *
- * It's safe to do the put_page here because page_alloc will
- * flush the TLBs if the page is reallocated before the end of
- * this loop.
- */
- if ( p2m_is_foreign(pte.p2m.type) )
- {
- ASSERT(mfn_valid(mfn));
- put_page(mfn_to_page(mfn));
- }
- /* Detect the xenheap page and mark the stored GFN as invalid. */
- else if ( p2m_is_ram(pte.p2m.type) && is_xen_heap_mfn(mfn) )
- page_set_xenheap_gfn(mfn_to_page(mfn), INVALID_GFN);
-}
-
-/* Free lpae sub-tree behind an entry */
-static void p2m_free_entry(struct p2m_domain *p2m,
- lpae_t entry, unsigned int level)
-{
- unsigned int i;
- lpae_t *table;
- mfn_t mfn;
- struct page_info *pg;
-
- /* Nothing to do if the entry is invalid. */
- if ( !p2m_is_valid(entry) )
- return;
-
- if ( p2m_is_superpage(entry, level) || (level == 3) )
- {
-#ifdef CONFIG_IOREQ_SERVER
- /*
- * If this gets called then either the entry was replaced by an entry
- * with a different base (valid case) or the shattering of a superpage
- * has failed (error case).
- * So, at worst, the spurious mapcache invalidation might be sent.
- */
- if ( p2m_is_ram(entry.p2m.type) &&
- domain_has_ioreq_server(p2m->domain) )
- ioreq_request_mapcache_invalidate(p2m->domain);
-#endif
-
- p2m->stats.mappings[level]--;
- /* Nothing to do if the entry is a super-page. */
- if ( level == 3 )
- p2m_put_l3_page(entry);
- return;
- }
-
- table = map_domain_page(lpae_get_mfn(entry));
- for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
- p2m_free_entry(p2m, *(table + i), level + 1);
-
- unmap_domain_page(table);
-
- /*
- * Make sure all the references in the TLB have been removed before
- * freing the intermediate page table.
- * XXX: Should we defer the free of the page table to avoid the
- * flush?
- */
- p2m_tlb_flush_sync(p2m);
-
- mfn = lpae_get_mfn(entry);
- ASSERT(mfn_valid(mfn));
-
- pg = mfn_to_page(mfn);
-
- page_list_del(pg, &p2m->pages);
- p2m_free_page(p2m->domain, pg);
-}
-
-static bool p2m_split_superpage(struct p2m_domain *p2m, lpae_t *entry,
- unsigned int level, unsigned int target,
- const unsigned int *offsets)
-{
- struct page_info *page;
- unsigned int i;
- lpae_t pte, *table;
- bool rv = true;
-
- /* Convenience aliases */
- mfn_t mfn = lpae_get_mfn(*entry);
- unsigned int next_level = level + 1;
- unsigned int level_order = XEN_PT_LEVEL_ORDER(next_level);
-
- /*
- * This should only be called with target != level and the entry is
- * a superpage.
- */
- ASSERT(level < target);
- ASSERT(p2m_is_superpage(*entry, level));
-
- page = p2m_alloc_page(p2m->domain);
- if ( !page )
- return false;
-
- page_list_add(page, &p2m->pages);
- table = __map_domain_page(page);
-
- /*
- * We are either splitting a first level 1G page into 512 second level
- * 2M pages, or a second level 2M page into 512 third level 4K pages.
- */
- for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
- {
- lpae_t *new_entry = table + i;
-
- /*
- * Use the content of the superpage entry and override
- * the necessary fields. So the correct permission are kept.
- */
- pte = *entry;
- lpae_set_mfn(pte, mfn_add(mfn, i << level_order));
-
- /*
- * First and second level pages set p2m.table = 0, but third
- * level entries set p2m.table = 1.
- */
- pte.p2m.table = (next_level == 3);
-
- write_pte(new_entry, pte);
- }
-
- /* Update stats */
- p2m->stats.shattered[level]++;
- p2m->stats.mappings[level]--;
- p2m->stats.mappings[next_level] += XEN_PT_LPAE_ENTRIES;
-
- /*
- * Shatter superpage in the page to the level we want to make the
- * changes.
- * This is done outside the loop to avoid checking the offset to
- * know whether the entry should be shattered for every entry.
- */
- if ( next_level != target )
- rv = p2m_split_superpage(p2m, table + offsets[next_level],
- level + 1, target, offsets);
-
- if ( p2m->clean_pte )
- clean_dcache_va_range(table, PAGE_SIZE);
-
- unmap_domain_page(table);
-
- /*
- * Even if we failed, we should install the newly allocated LPAE
- * entry. The caller will be in charge to free the sub-tree.
- */
- p2m_write_pte(entry, page_to_p2m_table(page), p2m->clean_pte);
-
- return rv;
-}
-
-/*
- * Insert an entry in the p2m. This should be called with a mapping
- * equal to a page/superpage (4K, 2M, 1G).
- */
-static int __p2m_set_entry(struct p2m_domain *p2m,
- gfn_t sgfn,
- unsigned int page_order,
- mfn_t smfn,
- p2m_type_t t,
- p2m_access_t a)
-{
- unsigned int level = 0;
- unsigned int target = 3 - (page_order / XEN_PT_LPAE_SHIFT);
- lpae_t *entry, *table, orig_pte;
- int rc;
- /* A mapping is removed if the MFN is invalid. */
- bool removing_mapping = mfn_eq(smfn, INVALID_MFN);
- DECLARE_OFFSETS(offsets, gfn_to_gaddr(sgfn));
-
- ASSERT(p2m_is_write_locked(p2m));
-
- /*
- * Check if the level target is valid: we only support
- * 4K - 2M - 1G mapping.
- */
- ASSERT(target > 0 && target <= 3);
-
- table = p2m_get_root_pointer(p2m, sgfn);
- if ( !table )
- return -EINVAL;
-
- for ( level = P2M_ROOT_LEVEL; level < target; level++ )
- {
- /*
- * Don't try to allocate intermediate page table if the mapping
- * is about to be removed.
- */
- rc = p2m_next_level(p2m, removing_mapping,
- level, &table, offsets[level]);
- if ( rc == GUEST_TABLE_MAP_FAILED )
- {
- /*
- * We are here because p2m_next_level has failed to map
- * the intermediate page table (e.g the table does not exist
- * and they p2m tree is read-only). It is a valid case
- * when removing a mapping as it may not exist in the
- * page table. In this case, just ignore it.
- */
- rc = removing_mapping ? 0 : -ENOENT;
- goto out;
- }
- else if ( rc != GUEST_TABLE_NORMAL_PAGE )
- break;
- }
-
- entry = table + offsets[level];
-
- /*
- * If we are here with level < target, we must be at a leaf node,
- * and we need to break up the superpage.
- */
- if ( level < target )
- {
- /* We need to split the original page. */
- lpae_t split_pte = *entry;
-
- ASSERT(p2m_is_superpage(*entry, level));
-
- if ( !p2m_split_superpage(p2m, &split_pte, level, target, offsets) )
- {
- /*
- * The current super-page is still in-place, so re-increment
- * the stats.
- */
- p2m->stats.mappings[level]++;
-
- /* Free the allocated sub-tree */
- p2m_free_entry(p2m, split_pte, level);
-
- rc = -ENOMEM;
- goto out;
- }
-
- /*
- * Follow the break-before-sequence to update the entry.
- * For more details see (D4.7.1 in ARM DDI 0487A.j).
- */
- p2m_remove_pte(entry, p2m->clean_pte);
- p2m_force_tlb_flush_sync(p2m);
-
- p2m_write_pte(entry, split_pte, p2m->clean_pte);
-
- /* then move to the level we want to make real changes */
- for ( ; level < target; level++ )
- {
- rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
-
- /*
- * The entry should be found and either be a table
- * or a superpage if level 3 is not targeted
- */
- ASSERT(rc == GUEST_TABLE_NORMAL_PAGE ||
- (rc == GUEST_TABLE_SUPER_PAGE && target < 3));
- }
-
- entry = table + offsets[level];
- }
-
- /*
- * We should always be there with the correct level because
- * all the intermediate tables have been installed if necessary.
- */
- ASSERT(level == target);
-
- orig_pte = *entry;
-
- /*
- * The radix-tree can only work on 4KB. This is only used when
- * memaccess is enabled and during shutdown.
- */
- ASSERT(!p2m->mem_access_enabled || page_order == 0 ||
- p2m->domain->is_dying);
- /*
- * The access type should always be p2m_access_rwx when the mapping
- * is removed.
- */
- ASSERT(!mfn_eq(INVALID_MFN, smfn) || (a == p2m_access_rwx));
- /*
- * Update the mem access permission before update the P2M. So we
- * don't have to revert the mapping if it has failed.
- */
- rc = p2m_mem_access_radix_set(p2m, sgfn, a);
- if ( rc )
- goto out;
-
- /*
- * Always remove the entry in order to follow the break-before-make
- * sequence when updating the translation table (D4.7.1 in ARM DDI
- * 0487A.j).
- */
- if ( lpae_is_valid(orig_pte) || removing_mapping )
- p2m_remove_pte(entry, p2m->clean_pte);
-
- if ( removing_mapping )
- /* Flush can be deferred if the entry is removed */
- p2m->need_flush |= !!lpae_is_valid(orig_pte);
- else
- {
- lpae_t pte = mfn_to_p2m_entry(smfn, t, a);
-
- if ( level < 3 )
- pte.p2m.table = 0; /* Superpage entry */
-
- /*
- * It is necessary to flush the TLB before writing the new entry
- * to keep coherency when the previous entry was valid.
- *
- * Although, it could be defered when only the permissions are
- * changed (e.g in case of memaccess).
- */
- if ( lpae_is_valid(orig_pte) )
- {
- if ( likely(!p2m->mem_access_enabled) ||
- P2M_CLEAR_PERM(pte) != P2M_CLEAR_PERM(orig_pte) )
- p2m_force_tlb_flush_sync(p2m);
- else
- p2m->need_flush = true;
- }
- else if ( !p2m_is_valid(orig_pte) ) /* new mapping */
- p2m->stats.mappings[level]++;
-
- p2m_write_pte(entry, pte, p2m->clean_pte);
-
- p2m->max_mapped_gfn = gfn_max(p2m->max_mapped_gfn,
- gfn_add(sgfn, (1UL << page_order) - 1));
- p2m->lowest_mapped_gfn = gfn_min(p2m->lowest_mapped_gfn, sgfn);
- }
-
- if ( is_iommu_enabled(p2m->domain) &&
- (lpae_is_valid(orig_pte) || lpae_is_valid(*entry)) )
- {
- unsigned int flush_flags = 0;
-
- if ( lpae_is_valid(orig_pte) )
- flush_flags |= IOMMU_FLUSHF_modified;
- if ( lpae_is_valid(*entry) )
- flush_flags |= IOMMU_FLUSHF_added;
-
- rc = iommu_iotlb_flush(p2m->domain, _dfn(gfn_x(sgfn)),
- 1UL << page_order, flush_flags);
- }
- else
- rc = 0;
-
- /*
- * Free the entry only if the original pte was valid and the base
- * is different (to avoid freeing when permission is changed).
- */
- if ( p2m_is_valid(orig_pte) &&
- !mfn_eq(lpae_get_mfn(*entry), lpae_get_mfn(orig_pte)) )
- p2m_free_entry(p2m, orig_pte, level);
-
-out:
- unmap_domain_page(table);
-
- return rc;
-}
-
-int p2m_set_entry(struct p2m_domain *p2m,
- gfn_t sgfn,
- unsigned long nr,
- mfn_t smfn,
- p2m_type_t t,
- p2m_access_t a)
-{
- int rc = 0;
-
- /*
- * Any reference taken by the P2M mappings (e.g. foreign mapping) will
- * be dropped in relinquish_p2m_mapping(). As the P2M will still
- * be accessible after, we need to prevent mapping to be added when the
- * domain is dying.
- */
- if ( unlikely(p2m->domain->is_dying) )
- return -ENOMEM;
-
- while ( nr )
- {
- unsigned long mask;
- unsigned long order;
-
- /*
- * Don't take into account the MFN when removing mapping (i.e
- * MFN_INVALID) to calculate the correct target order.
- *
- * XXX: Support superpage mappings if nr is not aligned to a
- * superpage size.
- */
- mask = !mfn_eq(smfn, INVALID_MFN) ? mfn_x(smfn) : 0;
- mask |= gfn_x(sgfn) | nr;
-
- /* Always map 4k by 4k when memaccess is enabled */
- if ( unlikely(p2m->mem_access_enabled) )
- order = THIRD_ORDER;
- else if ( !(mask & ((1UL << FIRST_ORDER) - 1)) )
- order = FIRST_ORDER;
- else if ( !(mask & ((1UL << SECOND_ORDER) - 1)) )
- order = SECOND_ORDER;
- else
- order = THIRD_ORDER;
-
- rc = __p2m_set_entry(p2m, sgfn, order, smfn, t, a);
- if ( rc )
- break;
-
- sgfn = gfn_add(sgfn, (1 << order));
- if ( !mfn_eq(smfn, INVALID_MFN) )
- smfn = mfn_add(smfn, (1 << order));
-
- nr -= (1 << order);
- }
-
- return rc;
-}
-
-/* Invalidate all entries in the table. The p2m should be write locked. */
-static void p2m_invalidate_table(struct p2m_domain *p2m, mfn_t mfn)
-{
- lpae_t *table;
- unsigned int i;
-
- ASSERT(p2m_is_write_locked(p2m));
-
- table = map_domain_page(mfn);
-
- for ( i = 0; i < XEN_PT_LPAE_ENTRIES; i++ )
- {
- lpae_t pte = table[i];
-
- /*
- * Writing an entry can be expensive because it may involve
- * cleaning the cache. So avoid updating the entry if the valid
- * bit is already cleared.
- */
- if ( !pte.p2m.valid )
- continue;
-
- pte.p2m.valid = 0;
-
- p2m_write_pte(&table[i], pte, p2m->clean_pte);
- }
-
- unmap_domain_page(table);
-
- p2m->need_flush = true;
-}
-
-/*
- * The domain will not be scheduled anymore, so in theory we should
- * not need to flush the TLBs. Do it for safety purpose.
- * Note that all the devices have already been de-assigned. So we don't
- * need to flush the IOMMU TLB here.
- */
-void p2m_clear_root_pages(struct p2m_domain *p2m)
-{
- unsigned int i;
-
- p2m_write_lock(p2m);
-
- for ( i = 0; i < P2M_ROOT_PAGES; i++ )
- clear_and_clean_page(p2m->root + i);
-
- p2m_force_tlb_flush_sync(p2m);
-
- p2m_write_unlock(p2m);
-}
-
-/*
- * Invalidate all entries in the root page-tables. This is
- * useful to get fault on entry and do an action.
- *
- * p2m_invalid_root() should not be called when the P2M is shared with
- * the IOMMU because it will cause IOMMU fault.
- */
-void p2m_invalidate_root(struct p2m_domain *p2m)
-{
- unsigned int i;
-
- ASSERT(!iommu_use_hap_pt(p2m->domain));
-
- p2m_write_lock(p2m);
-
- for ( i = 0; i < P2M_ROOT_LEVEL; i++ )
- p2m_invalidate_table(p2m, page_to_mfn(p2m->root + i));
-
- p2m_write_unlock(p2m);
-}
-
-/*
- * Resolve any translation fault due to change in the p2m. This
- * includes break-before-make and valid bit cleared.
- */
-bool p2m_resolve_translation_fault(struct domain *d, gfn_t gfn)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
- unsigned int level = 0;
- bool resolved = false;
- lpae_t entry, *table;
-
- /* Convenience aliases */
- DECLARE_OFFSETS(offsets, gfn_to_gaddr(gfn));
-
- p2m_write_lock(p2m);
-
- /* This gfn is higher than the highest the p2m map currently holds */
- if ( gfn_x(gfn) > gfn_x(p2m->max_mapped_gfn) )
- goto out;
-
- table = p2m_get_root_pointer(p2m, gfn);
- /*
- * The table should always be non-NULL because the gfn is below
- * p2m->max_mapped_gfn and the root table pages are always present.
- */
- if ( !table )
- {
- ASSERT_UNREACHABLE();
- goto out;
- }
-
- /*
- * Go down the page-tables until an entry has the valid bit unset or
- * a block/page entry has been hit.
- */
- for ( level = P2M_ROOT_LEVEL; level <= 3; level++ )
- {
- int rc;
-
- entry = table[offsets[level]];
-
- if ( level == 3 )
- break;
+mfn_t p2m_lookup(struct domain *d, gfn_t gfn, p2m_type_t *t)
+{
+ mfn_t mfn;
+ struct p2m_domain *p2m = p2m_get_hostp2m(d);
- /* Stop as soon as we hit an entry with the valid bit unset. */
- if ( !lpae_is_valid(entry) )
- break;
+ p2m_read_lock(p2m);
+ mfn = p2m_get_entry(p2m, gfn, t, NULL, NULL, NULL);
+ p2m_read_unlock(p2m);
- rc = p2m_next_level(p2m, true, level, &table, offsets[level]);
- if ( rc == GUEST_TABLE_MAP_FAILED )
- goto out_unmap;
- else if ( rc != GUEST_TABLE_NORMAL_PAGE )
- break;
- }
+ return mfn;
+}
- /*
- * If the valid bit of the entry is set, it means someone was playing with
- * the Stage-2 page table. Nothing to do and mark the fault as resolved.
- */
- if ( lpae_is_valid(entry) )
- {
- resolved = true;
- goto out_unmap;
- }
+struct page_info *p2m_get_page_from_gfn(struct domain *d, gfn_t gfn,
+ p2m_type_t *t)
+{
+ struct page_info *page;
+ p2m_type_t p2mt;
+ mfn_t mfn = p2m_lookup(d, gfn, &p2mt);
- /*
- * The valid bit is unset. If the entry is still not valid then the fault
- * cannot be resolved, exit and report it.
- */
- if ( !p2m_is_valid(entry) )
- goto out_unmap;
+ if ( t )
+ *t = p2mt;
- /*
- * Now we have an entry with valid bit unset, but still valid from
- * the P2M point of view.
- *
- * If an entry is pointing to a table, each entry of the table will
- * have there valid bit cleared. This allows a function to clear the
- * full p2m with just a couple of write. The valid bit will then be
- * propagated on the fault.
- * If an entry is pointing to a block/page, no work to do for now.
- */
- if ( lpae_is_table(entry, level) )
- p2m_invalidate_table(p2m, lpae_get_mfn(entry));
+ if ( !p2m_is_any_ram(p2mt) )
+ return NULL;
- /*
- * Now that the work on the entry is done, set the valid bit to prevent
- * another fault on that entry.
- */
- resolved = true;
- entry.p2m.valid = 1;
+ if ( !mfn_valid(mfn) )
+ return NULL;
- p2m_write_pte(table + offsets[level], entry, p2m->clean_pte);
+ page = mfn_to_page(mfn);
/*
- * No need to flush the TLBs as the modified entry had the valid bit
- * unset.
+ * get_page won't work on foreign mapping because the page doesn't
+ * belong to the current domain.
*/
+ if ( p2m_is_foreign(p2mt) )
+ {
+ struct domain *fdom = page_get_owner_and_reference(page);
+ ASSERT(fdom != NULL);
+ ASSERT(fdom != d);
+ return page;
+ }
-out_unmap:
- unmap_domain_page(table);
+ return get_page(page, d) ? page : NULL;
+}
-out:
- p2m_write_unlock(p2m);
+int guest_physmap_mark_populate_on_demand(struct domain *d,
+ unsigned long gfn,
+ unsigned int order)
+{
+ return -ENOSYS;
+}
- return resolved;
+unsigned long p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn,
+ unsigned int order)
+{
+ return 0;
}
int p2m_insert_mapping(struct domain *d, gfn_t start_gfn, unsigned long nr,
@@ -1612,44 +244,6 @@ int set_foreign_p2m_entry(struct domain *d, const struct domain *fd,
return rc;
}
-static struct page_info *p2m_allocate_root(void)
-{
- struct page_info *page;
- unsigned int i;
-
- page = alloc_domheap_pages(NULL, P2M_ROOT_ORDER, 0);
- if ( page == NULL )
- return NULL;
-
- /* Clear both first level pages */
- for ( i = 0; i < P2M_ROOT_PAGES; i++ )
- clear_and_clean_page(page + i);
-
- return page;
-}
-
-static int p2m_alloc_table(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
-
- p2m->root = p2m_allocate_root();
- if ( !p2m->root )
- return -ENOMEM;
-
- p2m->vttbr = generate_vttbr(p2m->vmid, page_to_mfn(p2m->root));
-
- /*
- * Make sure that all TLBs corresponding to the new VMID are flushed
- * before using it
- */
- p2m_write_lock(p2m);
- p2m_force_tlb_flush_sync(p2m);
- p2m_write_unlock(p2m);
-
- return 0;
-}
-
-
static spinlock_t vmid_alloc_lock = SPIN_LOCK_UNLOCKED;
/*
@@ -1660,7 +254,7 @@ static spinlock_t vmid_alloc_lock = SPIN_LOCK_UNLOCKED;
*/
static unsigned long *vmid_mask;
-static void p2m_vmid_allocator_init(void)
+void p2m_vmid_allocator_init(void)
{
/*
* allocate space for vmid_mask based on MAX_VMID
@@ -1673,7 +267,7 @@ static void p2m_vmid_allocator_init(void)
set_bit(INVALID_VMID, vmid_mask);
}
-static int p2m_alloc_vmid(struct domain *d)
+int p2m_alloc_vmid(struct domain *d)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
@@ -1703,7 +297,7 @@ out:
return rc;
}
-static void p2m_free_vmid(struct domain *d)
+void p2m_free_vmid(struct domain *d)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
spin_lock(&vmid_alloc_lock);
@@ -1713,187 +307,6 @@ static void p2m_free_vmid(struct domain *d)
spin_unlock(&vmid_alloc_lock);
}
-int p2m_teardown(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
- unsigned long count = 0;
- struct page_info *pg;
- int rc = 0;
-
- p2m_write_lock(p2m);
-
- while ( (pg = page_list_remove_head(&p2m->pages)) )
- {
- p2m_free_page(p2m->domain, pg);
- count++;
- /* Arbitrarily preempt every 512 iterations */
- if ( !(count % 512) && hypercall_preempt_check() )
- {
- rc = -ERESTART;
- break;
- }
- }
-
- p2m_write_unlock(p2m);
-
- return rc;
-}
-
-void p2m_final_teardown(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
-
- /* p2m not actually initialized */
- if ( !p2m->domain )
- return;
-
- /*
- * No need to call relinquish_p2m_mapping() here because
- * p2m_final_teardown() is called either after domain_relinquish_resources()
- * where relinquish_p2m_mapping() has been called.
- */
-
- ASSERT(page_list_empty(&p2m->pages));
-
- while ( p2m_teardown_allocation(d) == -ERESTART )
- continue; /* No preemption support here */
- ASSERT(page_list_empty(&d->arch.paging.p2m_freelist));
-
- if ( p2m->root )
- free_domheap_pages(p2m->root, P2M_ROOT_ORDER);
-
- p2m->root = NULL;
-
- p2m_free_vmid(d);
-
- radix_tree_destroy(&p2m->mem_access_settings, NULL);
-
- p2m->domain = NULL;
-}
-
-int p2m_init(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
- int rc;
- unsigned int cpu;
-
- rwlock_init(&p2m->lock);
- spin_lock_init(&d->arch.paging.lock);
- INIT_PAGE_LIST_HEAD(&p2m->pages);
- INIT_PAGE_LIST_HEAD(&d->arch.paging.p2m_freelist);
-
- p2m->vmid = INVALID_VMID;
- p2m->max_mapped_gfn = _gfn(0);
- p2m->lowest_mapped_gfn = _gfn(ULONG_MAX);
-
- p2m->default_access = p2m_access_rwx;
- p2m->mem_access_enabled = false;
- radix_tree_init(&p2m->mem_access_settings);
-
- /*
- * Some IOMMUs don't support coherent PT walk. When the p2m is
- * shared with the CPU, Xen has to make sure that the PT changes have
- * reached the memory
- */
- p2m->clean_pte = is_iommu_enabled(d) &&
- !iommu_has_feature(d, IOMMU_FEAT_COHERENT_WALK);
-
- /*
- * Make sure that the type chosen to is able to store the an vCPU ID
- * between 0 and the maximum of virtual CPUS supported as long as
- * the INVALID_VCPU_ID.
- */
- BUILD_BUG_ON((1 << (sizeof(p2m->last_vcpu_ran[0]) * 8)) < MAX_VIRT_CPUS);
- BUILD_BUG_ON((1 << (sizeof(p2m->last_vcpu_ran[0])* 8)) < INVALID_VCPU_ID);
-
- for_each_possible_cpu(cpu)
- p2m->last_vcpu_ran[cpu] = INVALID_VCPU_ID;
-
- /*
- * "Trivial" initialisation is now complete. Set the backpointer so
- * p2m_teardown() and friends know to do something.
- */
- p2m->domain = d;
-
- rc = p2m_alloc_vmid(d);
- if ( rc )
- return rc;
-
- rc = p2m_alloc_table(d);
- if ( rc )
- return rc;
-
- return 0;
-}
-
-/*
- * The function will go through the p2m and remove page reference when it
- * is required. The mapping will be removed from the p2m.
- *
- * XXX: See whether the mapping can be left intact in the p2m.
- */
-int relinquish_p2m_mapping(struct domain *d)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(d);
- unsigned long count = 0;
- p2m_type_t t;
- int rc = 0;
- unsigned int order;
- gfn_t start, end;
-
- BUG_ON(!d->is_dying);
- /* No mappings can be added in the P2M after the P2M lock is released. */
- p2m_write_lock(p2m);
-
- start = p2m->lowest_mapped_gfn;
- end = gfn_add(p2m->max_mapped_gfn, 1);
-
- for ( ; gfn_x(start) < gfn_x(end);
- start = gfn_next_boundary(start, order) )
- {
- mfn_t mfn = p2m_get_entry(p2m, start, &t, NULL, &order, NULL);
-
- count++;
- /*
- * Arbitrarily preempt every 512 iterations.
- */
- if ( !(count % 512) && hypercall_preempt_check() )
- {
- rc = -ERESTART;
- break;
- }
-
- /*
- * p2m_set_entry will take care of removing reference on page
- * when it is necessary and removing the mapping in the p2m.
- */
- if ( !mfn_eq(mfn, INVALID_MFN) )
- {
- /*
- * For valid mapping, the start will always be aligned as
- * entry will be removed whilst relinquishing.
- */
- rc = __p2m_set_entry(p2m, start, order, INVALID_MFN,
- p2m_invalid, p2m_access_rwx);
- if ( unlikely(rc) )
- {
- printk(XENLOG_G_ERR "Unable to remove mapping gfn=%#"PRI_gfn" order=%u from the p2m of domain %d\n", gfn_x(start), order, d->domain_id);
- break;
- }
- }
- }
-
- /*
- * Update lowest_mapped_gfn so on the next call we still start where
- * we stopped.
- */
- p2m->lowest_mapped_gfn = start;
-
- p2m_write_unlock(p2m);
-
- return rc;
-}
-
int p2m_cache_flush_range(struct domain *d, gfn_t *pstart, gfn_t end)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
@@ -1987,43 +400,6 @@ int p2m_cache_flush_range(struct domain *d, gfn_t *pstart, gfn_t end)
return rc;
}
-/*
- * Clean & invalidate RAM associated to the guest vCPU.
- *
- * The function can only work with the current vCPU and should be called
- * with IRQ enabled as the vCPU could get preempted.
- */
-void p2m_flush_vm(struct vcpu *v)
-{
- struct p2m_domain *p2m = p2m_get_hostp2m(v->domain);
- int rc;
- gfn_t start = _gfn(0);
-
- ASSERT(v == current);
- ASSERT(local_irq_is_enabled());
- ASSERT(v->arch.need_flush_to_ram);
-
- do
- {
- rc = p2m_cache_flush_range(v->domain, &start, _gfn(ULONG_MAX));
- if ( rc == -ERESTART )
- do_softirq();
- } while ( rc == -ERESTART );
-
- if ( rc != 0 )
- gprintk(XENLOG_WARNING,
- "P2M has not been correctly cleaned (rc = %d)\n",
- rc);
-
- /*
- * Invalidate the p2m to track which page was modified by the guest
- * between call of p2m_flush_vm().
- */
- p2m_invalidate_root(p2m);
-
- v->arch.need_flush_to_ram = false;
-}
-
/*
* See note at ARMv7 ARM B1.14.4 (DDI 0406C.c) (TL;DR: S/W ops are not
* easily virtualized).
@@ -2217,197 +593,6 @@ void __init p2m_restrict_ipa_bits(unsigned int ipa_bits)
p2m_ipa_bits = ipa_bits;
}
-/* VTCR value to be configured by all CPUs. Set only once by the boot CPU */
-static register_t __read_mostly vtcr;
-
-static void setup_virt_paging_one(void *data)
-{
- WRITE_SYSREG(vtcr, VTCR_EL2);
-
- /*
- * ARM64_WORKAROUND_AT_SPECULATE: We want to keep the TLBs free from
- * entries related to EL1/EL0 translation regime until a guest vCPU
- * is running. For that, we need to set-up VTTBR to point to an empty
- * page-table and turn on stage-2 translation. The TLB entries
- * associated with EL1/EL0 translation regime will also be flushed in case
- * an AT instruction was speculated before hand.
- */
- if ( cpus_have_cap(ARM64_WORKAROUND_AT_SPECULATE) )
- {
- WRITE_SYSREG64(generate_vttbr(INVALID_VMID, empty_root_mfn), VTTBR_EL2);
- WRITE_SYSREG(READ_SYSREG(HCR_EL2) | HCR_VM, HCR_EL2);
- isb();
-
- flush_all_guests_tlb_local();
- }
-}
-
-void __init setup_virt_paging(void)
-{
- /* Setup Stage 2 address translation */
- register_t val = VTCR_RES1|VTCR_SH0_IS|VTCR_ORGN0_WBWA|VTCR_IRGN0_WBWA;
-
- static const struct {
- unsigned int pabits; /* Physical Address Size */
- unsigned int t0sz; /* Desired T0SZ, minimum in comment */
- unsigned int root_order; /* Page order of the root of the p2m */
- unsigned int sl0; /* Desired SL0, maximum in comment */
- } pa_range_info[] __initconst = {
- /* T0SZ minimum and SL0 maximum from ARM DDI 0487H.a Table D5-6 */
- /* PA size, t0sz(min), root-order, sl0(max) */
-#ifdef CONFIG_ARM_64
- [0] = { 32, 32/*32*/, 0, 1 },
- [1] = { 36, 28/*28*/, 0, 1 },
- [2] = { 40, 24/*24*/, 1, 1 },
- [3] = { 42, 22/*22*/, 3, 1 },
- [4] = { 44, 20/*20*/, 0, 2 },
- [5] = { 48, 16/*16*/, 0, 2 },
- [6] = { 52, 12/*12*/, 4, 2 },
- [7] = { 0 } /* Invalid */
-#else
- { 32, 0/*0*/, 0, 1 },
- { 40, 24/*24*/, 1, 1 }
-#endif
- };
-
- unsigned int i;
- unsigned int pa_range = 0x10; /* Larger than any possible value */
-
-#ifdef CONFIG_ARM_32
- /*
- * Typecast pa_range_info[].t0sz into arm32 bit variant.
- *
- * VTCR.T0SZ is bits [3:0] and S(sign extension), bit[4] for arm322.
- * Thus, pa_range_info[].t0sz is translated to its arm32 variant using
- * struct bitfields.
- */
- struct
- {
- signed int val:5;
- } t0sz_32;
-#else
- /*
- * Restrict "p2m_ipa_bits" if needed. As P2M table is always configured
- * with IPA bits == PA bits, compare against "pabits".
- */
- if ( pa_range_info[system_cpuinfo.mm64.pa_range].pabits < p2m_ipa_bits )
- p2m_ipa_bits = pa_range_info[system_cpuinfo.mm64.pa_range].pabits;
-
- /*
- * cpu info sanitization made sure we support 16bits VMID only if all
- * cores are supporting it.
- */
- if ( system_cpuinfo.mm64.vmid_bits == MM64_VMID_16_BITS_SUPPORT )
- max_vmid = MAX_VMID_16_BIT;
-#endif
-
- /* Choose suitable "pa_range" according to the resulted "p2m_ipa_bits". */
- for ( i = 0; i < ARRAY_SIZE(pa_range_info); i++ )
- {
- if ( p2m_ipa_bits == pa_range_info[i].pabits )
- {
- pa_range = i;
- break;
- }
- }
-
- /* Check if we found the associated entry in the array */
- if ( pa_range >= ARRAY_SIZE(pa_range_info) || !pa_range_info[pa_range].pabits )
- panic("%u-bit P2M is not supported\n", p2m_ipa_bits);
-
-#ifdef CONFIG_ARM_64
- val |= VTCR_PS(pa_range);
- val |= VTCR_TG0_4K;
-
- /* Set the VS bit only if 16 bit VMID is supported. */
- if ( MAX_VMID == MAX_VMID_16_BIT )
- val |= VTCR_VS;
-#endif
-
- val |= VTCR_SL0(pa_range_info[pa_range].sl0);
- val |= VTCR_T0SZ(pa_range_info[pa_range].t0sz);
-
- p2m_root_order = pa_range_info[pa_range].root_order;
- p2m_root_level = 2 - pa_range_info[pa_range].sl0;
-
-#ifdef CONFIG_ARM_64
- p2m_ipa_bits = 64 - pa_range_info[pa_range].t0sz;
-#else
- t0sz_32.val = pa_range_info[pa_range].t0sz;
- p2m_ipa_bits = 32 - t0sz_32.val;
-#endif
-
- printk("P2M: %d-bit IPA with %d-bit PA and %d-bit VMID\n",
- p2m_ipa_bits,
- pa_range_info[pa_range].pabits,
- ( MAX_VMID == MAX_VMID_16_BIT ) ? 16 : 8);
-
- printk("P2M: %d levels with order-%d root, VTCR 0x%"PRIregister"\n",
- 4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, val);
-
- p2m_vmid_allocator_init();
-
- /* It is not allowed to concatenate a level zero root */
- BUG_ON( P2M_ROOT_LEVEL == 0 && P2M_ROOT_ORDER > 0 );
- vtcr = val;
-
- /*
- * ARM64_WORKAROUND_AT_SPECULATE requires to allocate root table
- * with all entries zeroed.
- */
- if ( cpus_have_cap(ARM64_WORKAROUND_AT_SPECULATE) )
- {
- struct page_info *root;
-
- root = p2m_allocate_root();
- if ( !root )
- panic("Unable to allocate root table for ARM64_WORKAROUND_AT_SPECULATE\n");
-
- empty_root_mfn = page_to_mfn(root);
- }
-
- setup_virt_paging_one(NULL);
- smp_call_function(setup_virt_paging_one, NULL, 1);
-}
-
-static int cpu_virt_paging_callback(struct notifier_block *nfb,
- unsigned long action,
- void *hcpu)
-{
- switch ( action )
- {
- case CPU_STARTING:
- ASSERT(system_state != SYS_STATE_boot);
- setup_virt_paging_one(NULL);
- break;
- default:
- break;
- }
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block cpu_virt_paging_nfb = {
- .notifier_call = cpu_virt_paging_callback,
-};
-
-static int __init cpu_virt_paging_init(void)
-{
- register_cpu_notifier(&cpu_virt_paging_nfb);
-
- return 0;
-}
-/*
- * Initialization of the notifier has to be done at init rather than presmp_init
- * phase because: the registered notifier is used to setup virtual paging for
- * non-boot CPUs after the initial virtual paging for all CPUs is already setup,
- * i.e. when a non-boot CPU is hotplugged after the system has booted. In other
- * words, the notifier should be registered after the virtual paging is
- * initially setup (setup_virt_paging() is called from start_xen()). This is
- * required because vtcr config value has to be set before a notifier can fire.
- */
-__initcall(cpu_virt_paging_init);
-
/*
* Local variables:
* mode: C
--
2.25.1Hi Henry, On 23/10/2023 03:13, Henry Wang wrote: > From: Penny Zheng <penny.zheng@arm.com> > > Current P2M implementation is designed for MMU system only. > We move the MMU-specific codes into mmu/p2m.c, and only keep generic > codes in p2m.c, like VMID allocator, etc. We also move MMU-specific > definitions and declarations to mmu/p2m.h, such as p2m_tlb_flush_sync(). > Also expose previously static functions p2m_vmid_allocator_init(), > p2m_alloc_vmid() for further MPU usage. Since with the code movement > p2m_free_vmid() is now used in two files, also expose p2m_free_vmid(). > > With the code movement, global variable max_vmid is used in multiple > files instead of a single file (and will be used in MPU P2M > implementation), declare it in the header and remove the "static" of > this variable. > > Also, since p2m_invalidate_root() should be MMU only and after the > code movement the only caller of p2m_invalidate_root() outside of > mmu/p2m.c is arch_domain_creation_finished(), creating a new function > named p2m_domain_creation_finished() in mmu/p2m.c for the original > code in arch_domain_creation_finished(), and marking > p2m_invalidate_root() as static. > > Take the opportunity to fix the incorrect coding style when possible. > When there is bit shift in macros, take the opportunity to add the > missing 'U' as a compliance of MISRA. > > Signed-off-by: Penny Zheng <penny.zheng@arm.com> > Signed-off-by: Wei Chen <wei.chen@arm.com> > Signed-off-by: Henry Wang <Henry.Wang@arm.com> Acked-by: Julien Grall <jgrall@amazon.com> I think the series is now fully acked. But I will wait for 4.18 to be released before merging this series. Please remind me in a couple of weeks time if I forgot to merge it. Cheers, -- Julien Grall
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