[Xen-devel] [PATCH v3 0/3] AMD/IOMMU: re-work mode updating

Jan Beulich posted 3 patches 1 week ago
Only 0 patches received!

[Xen-devel] [PATCH v3 0/3] AMD/IOMMU: re-work mode updating

Posted by Jan Beulich 1 week ago
update_paging_mode() in the AMD IOMMU code expects to be invoked with
the PCI devices lock held. The check occurring only when the mode
actually needs updating, the violation of this rule by the majority
of callers did go unnoticed until per-domain IOMMU setup was changed
to do away with on-demand creation of IOMMU page tables.

Unfortunately the only half way reasonable fix to this that I could
come up with requires more re-work than would seem desirable at this
time of the release process, but addressing the issue seems
unavoidable to me as its manifestation is a regression from the
IOMMU page table setup re-work. The change also isn't without risk
of further regressions - if in patch 2 I've missed a code path that
would also need to invoke the new hook, then this might mean non-
working guests (with passed-through devices on AMD hardware).

1: introduce GFN notification for translated domains
2: AMD/IOMMU: use notify_dfn() hook to update paging mode
3: gnttab: don't expose host physical address without need

Jan

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[Xen-devel] [PATCH v3 1/3] introduce GFN notification for translated domains

Posted by Jan Beulich 1 week ago
In order for individual IOMMU drivers (and from an abstract pov also
architectures) to be able to adjust, ahead of actual mapping requests,
their data structures when they might cover only a sub-range of all
possible GFNs, introduce a notification call used by various code paths
potentially installing a fresh mapping of a never used GFN (for a
particular domain).

Note that before this patch, in gnttab_transfer(), once past
assign_pages(), further errors modifying the physmap are ignored
(presumably because it would be too complicated to try to roll back at
that point). This patch follows suit by ignoring failed notify_gfn()s or
races due to the need to intermediately drop locks, simply printing out
a warning that the gfn may not be accessible due to the failure.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
v3: Conditionalize upon CONFIG_IOMMU_FORCE_PT_SHARE, also covering the
    share_p2m_table() functionality as appropriate. Un-comment the
    GNTMAP_host_map check.
v2: Introduce arch_notify_gfn(), to invoke gfn_valid() on x86 (this
    unfortunately means it and notify_gfn() now need to be macros, or
    else include file dependencies get in the way, as gfn_valid() lives
    in paging.h, which we shouldn't include from xen/sched.h). Improve
    description.

TBD: Does Arm actually have anything to check against in its
     arch_notify_gfn()?

--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -173,7 +173,8 @@ static int __init pvh_populate_memory_ra
             continue;
         }
 
-        rc = guest_physmap_add_page(d, _gfn(start), page_to_mfn(page),
+        rc = notify_gfn(d, _gfn(start + (1UL << order) - 1)) ?:
+             guest_physmap_add_page(d, _gfn(start), page_to_mfn(page),
                                     order);
         if ( rc != 0 )
         {
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4304,9 +4304,17 @@ static int hvmop_set_param(
         if ( a.value > SHUTDOWN_MAX )
             rc = -EINVAL;
         break;
+
     case HVM_PARAM_IOREQ_SERVER_PFN:
-        d->arch.hvm.ioreq_gfn.base = a.value;
+        if ( d->arch.hvm.params[HVM_PARAM_NR_IOREQ_SERVER_PAGES] )
+            rc = notify_gfn(
+                     d,
+                     _gfn(a.value + d->arch.hvm.params
+                                    [HVM_PARAM_NR_IOREQ_SERVER_PAGES] - 1));
+        if ( !rc )
+             d->arch.hvm.ioreq_gfn.base = a.value;
         break;
+
     case HVM_PARAM_NR_IOREQ_SERVER_PAGES:
     {
         unsigned int i;
@@ -4317,6 +4325,9 @@ static int hvmop_set_param(
             rc = -EINVAL;
             break;
         }
+        rc = notify_gfn(d, _gfn(d->arch.hvm.ioreq_gfn.base + a.value - 1));
+        if ( rc )
+            break;
         for ( i = 0; i < a.value; i++ )
             set_bit(i, &d->arch.hvm.ioreq_gfn.mask);
 
@@ -4330,7 +4341,11 @@ static int hvmop_set_param(
         BUILD_BUG_ON(HVM_PARAM_BUFIOREQ_PFN >
                      sizeof(d->arch.hvm.ioreq_gfn.legacy_mask) * 8);
         if ( a.value )
-            set_bit(a.index, &d->arch.hvm.ioreq_gfn.legacy_mask);
+        {
+            rc = notify_gfn(d, _gfn(a.value));
+            if ( !rc )
+                set_bit(a.index, &d->arch.hvm.ioreq_gfn.legacy_mask);
+        }
         break;
 
     case HVM_PARAM_X87_FIP_WIDTH:
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -946,6 +946,16 @@ map_grant_ref(
         return;
     }
 
+    if ( paging_mode_translate(ld) && (op->flags & GNTMAP_host_map) &&
+         (rc = notify_gfn(ld, gaddr_to_gfn(op->host_addr))) )
+    {
+        gdprintk(XENLOG_INFO, "notify(%"PRI_gfn") -> %d\n",
+                 gfn_x(gaddr_to_gfn(op->host_addr)), rc);
+        op->status = GNTST_general_error;
+        return;
+        BUILD_BUG_ON(GNTST_okay);
+    }
+
     if ( unlikely((rd = rcu_lock_domain_by_id(op->dom)) == NULL) )
     {
         gdprintk(XENLOG_INFO, "Could not find domain %d\n", op->dom);
@@ -2123,6 +2133,7 @@ gnttab_transfer(
     {
         bool_t okay;
         int rc;
+        gfn_t gfn;
 
         if ( i && hypercall_preempt_check() )
             return i;
@@ -2300,21 +2311,52 @@ gnttab_transfer(
         act = active_entry_acquire(e->grant_table, gop.ref);
 
         if ( evaluate_nospec(e->grant_table->gt_version == 1) )
+            gfn = _gfn(shared_entry_v1(e->grant_table, gop.ref).frame);
+        else
+            gfn = _gfn(shared_entry_v2(e->grant_table, gop.ref).full_page.frame);
+
+        if ( paging_mode_translate(e) )
         {
-            grant_entry_v1_t *sha = &shared_entry_v1(e->grant_table, gop.ref);
+            gfn_t gfn2;
+
+            active_entry_release(act);
+            grant_read_unlock(e->grant_table);
+
+            rc = notify_gfn(e, gfn);
+            if ( rc )
+                printk(XENLOG_G_WARNING
+                       "%pd: gref %u: xfer GFN %"PRI_gfn" may be inaccessible (%d)\n",
+                       e, gop.ref, gfn_x(gfn), rc);
+
+            grant_read_lock(e->grant_table);
+            act = active_entry_acquire(e->grant_table, gop.ref);
 
-            guest_physmap_add_page(e, _gfn(sha->frame), mfn, 0);
-            if ( !paging_mode_translate(e) )
-                sha->frame = mfn_x(mfn);
+            if ( evaluate_nospec(e->grant_table->gt_version == 1) )
+                gfn2 = _gfn(shared_entry_v1(e->grant_table, gop.ref).frame);
+            else
+                gfn2 = _gfn(shared_entry_v2(e->grant_table, gop.ref).
+                    full_page.frame);
+
+            if ( !gfn_eq(gfn, gfn2) )
+            {
+                printk(XENLOG_G_WARNING
+                       "%pd: gref %u: xfer GFN went %"PRI_gfn" -> %"PRI_gfn"\n",
+                       e, gop.ref, gfn_x(gfn), gfn_x(gfn2));
+                gfn = gfn2;
+            }
         }
-        else
-        {
-            grant_entry_v2_t *sha = &shared_entry_v2(e->grant_table, gop.ref);
 
-            guest_physmap_add_page(e, _gfn(sha->full_page.frame), mfn, 0);
-            if ( !paging_mode_translate(e) )
-                sha->full_page.frame = mfn_x(mfn);
+        guest_physmap_add_page(e, gfn, mfn, 0);
+
+        if ( !paging_mode_translate(e) )
+        {
+            if ( evaluate_nospec(e->grant_table->gt_version == 1) )
+                shared_entry_v1(e->grant_table, gop.ref).frame = mfn_x(mfn);
+            else
+                shared_entry_v2(e->grant_table, gop.ref).full_page.frame =
+                    mfn_x(mfn);
         }
+
         smp_wmb();
         shared_entry_header(e->grant_table, gop.ref)->flags |=
             GTF_transfer_completed;
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -203,6 +203,10 @@ static void populate_physmap(struct memo
         if ( unlikely(__copy_from_guest_offset(&gpfn, a->extent_list, i, 1)) )
             goto out;
 
+        if ( paging_mode_translate(d) &&
+             notify_gfn(d, _gfn(gpfn + (1U << a->extent_order) - 1)) )
+            goto out;
+
         if ( a->memflags & MEMF_populate_on_demand )
         {
             /* Disallow populating PoD pages on oneself. */
@@ -745,6 +749,10 @@ static long memory_exchange(XEN_GUEST_HA
                 continue;
             }
 
+            if ( paging_mode_translate(d) )
+                rc = notify_gfn(d,
+                                _gfn(gpfn + (1U << exch.out.extent_order) - 1));
+
             mfn = page_to_mfn(page);
             guest_physmap_add_page(d, _gfn(gpfn), mfn,
                                    exch.out.extent_order);
@@ -813,12 +821,20 @@ int xenmem_add_to_physmap(struct domain
         extra.foreign_domid = DOMID_INVALID;
 
     if ( xatp->space != XENMAPSPACE_gmfn_range )
-        return xenmem_add_to_physmap_one(d, xatp->space, extra,
+        return notify_gfn(d, _gfn(xatp->gpfn)) ?:
+               xenmem_add_to_physmap_one(d, xatp->space, extra,
                                          xatp->idx, _gfn(xatp->gpfn));
 
     if ( xatp->size < start )
         return -EILSEQ;
 
+    if ( !start && xatp->size )
+    {
+        rc = notify_gfn(d, _gfn(xatp->gpfn + xatp->size - 1));
+        if ( rc )
+            return rc;
+    }
+
     xatp->idx += start;
     xatp->gpfn += start;
     xatp->size -= start;
@@ -891,7 +907,8 @@ static int xenmem_add_to_physmap_batch(s
                                                extent, 1)) )
             return -EFAULT;
 
-        rc = xenmem_add_to_physmap_one(d, xatpb->space,
+        rc = notify_gfn(d, _gfn(gpfn)) ?:
+             xenmem_add_to_physmap_one(d, xatpb->space,
                                        xatpb->u,
                                        idx, _gfn(gpfn));
 
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -522,6 +522,7 @@ int iommu_do_domctl(
     return ret;
 }
 
+#ifndef CONFIG_IOMMU_FORCE_PT_SHARE
 void iommu_share_p2m_table(struct domain* d)
 {
     ASSERT(hap_enabled(d));
@@ -530,6 +531,15 @@ void iommu_share_p2m_table(struct domain
         iommu_get_ops()->share_p2m(d);
 }
 
+int iommu_notify_gfn(struct domain *d, gfn_t gfn)
+{
+    const struct iommu_ops *ops = dom_iommu(d)->platform_ops;
+
+    return need_iommu_pt_sync(d) && ops->notify_dfn
+           ? iommu_call(ops, notify_dfn, d, _dfn(gfn_x(gfn))) : 0;
+}
+#endif
+
 void iommu_crash_shutdown(void)
 {
     if ( !iommu_crash_disable )
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -272,6 +272,8 @@ static inline void free_vcpu_guest_conte
 
 static inline void arch_vcpu_block(struct vcpu *v) {}
 
+#define arch_notify_gfn(d, gfn) ((void)(d), (void)(gfn), 0)
+
 #endif /* __ASM_DOMAIN_H__ */
 
 /*
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -647,6 +647,8 @@ static inline void free_vcpu_guest_conte
 
 void arch_vcpu_regs_init(struct vcpu *v);
 
+#define arch_notify_gfn(d, gfn) (gfn_valid(d, gfn) ? 0 : -EADDRNOTAVAIL)
+
 struct vcpu_hvm_context;
 int arch_set_info_hvm_guest(struct vcpu *v, const struct vcpu_hvm_context *ctx);
 
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -237,6 +237,11 @@ struct iommu_ops {
     int __must_check (*lookup_page)(struct domain *d, dfn_t dfn, mfn_t *mfn,
                                     unsigned int *flags);
 
+#ifndef CONFIG_IOMMU_FORCE_PT_SHARE
+    void (*share_p2m)(struct domain *d);
+    int __must_check (*notify_dfn)(struct domain *d, dfn_t dfn);
+#endif
+
     void (*free_page_table)(struct page_info *);
 
 #ifdef CONFIG_X86
@@ -253,7 +258,6 @@ struct iommu_ops {
 
     int __must_check (*suspend)(void);
     void (*resume)(void);
-    void (*share_p2m)(struct domain *d);
     void (*crash_shutdown)(void);
     int __must_check (*iotlb_flush)(struct domain *d, dfn_t dfn,
                                     unsigned int page_count,
@@ -330,7 +334,15 @@ void iommu_resume(void);
 void iommu_crash_shutdown(void);
 int iommu_get_reserved_device_memory(iommu_grdm_t *, void *);
 
+#ifndef CONFIG_IOMMU_FORCE_PT_SHARE
 void iommu_share_p2m_table(struct domain *d);
+int __must_check iommu_notify_gfn(struct domain *d, gfn_t gfn);
+#else
+static inline int __must_check iommu_notify_gfn(struct domain *d, gfn_t gfn)
+{
+    return 0;
+}
+#endif
 
 #ifdef CONFIG_HAS_PCI
 int iommu_do_pci_domctl(struct xen_domctl *, struct domain *d,
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -1039,6 +1039,8 @@ static always_inline bool is_iommu_enabl
     return evaluate_nospec(d->options & XEN_DOMCTL_CDF_iommu);
 }
 
+#define notify_gfn(d, gfn) (arch_notify_gfn(d, gfn) ?: iommu_notify_gfn(d, gfn))
+
 extern bool sched_smt_power_savings;
 extern bool sched_disable_smt_switching;
 


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[Xen-devel] [PATCH v3 2/3] AMD/IOMMU: use notify_dfn() hook to update paging mode

Posted by Jan Beulich 1 week ago
update_paging_mode() expects to be invoked with the PCI devices lock
held. The check occurring only when the mode actually needs updating,
the violation of this rule by the majority of callers did go unnoticed
until per-domain IOMMU setup was changed to do away with on-demand
creation of IOMMU page tables.

Acquiring the necessary lock in amd_iommu_map_page() or intermediate
layers in generic IOMMU code is not possible - we'd risk all sorts of
lock order violations. Hence the call to update_paging_mode() gets
pulled out of the function, to be invoked instead from the new
notify_dfn() hook, where no potentially conflicting locks are being
held by the callers.

Similarly the call to amd_iommu_alloc_root() gets pulled out - now
that we receive notification of all DFN range increases, there's no
need anymore to do this check when actually mapping a page.

Note that this ought to result in a small performance improvement as
well: The hook often gets invoked just once for larger blocks of pages,
so rather than going through amd_iommu_alloc_root() and
update_paging_mode() once per page, we may now invoke it just once per
batch.

Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -383,35 +383,16 @@ int amd_iommu_map_page(struct domain *d,
                        unsigned int flags, unsigned int *flush_flags)
 {
     struct domain_iommu *hd = dom_iommu(d);
-    int rc;
     unsigned long pt_mfn[7];
 
     memset(pt_mfn, 0, sizeof(pt_mfn));
 
     spin_lock(&hd->arch.mapping_lock);
 
-    rc = amd_iommu_alloc_root(hd);
-    if ( rc )
+    if ( !hd->arch.root_table )
     {
         spin_unlock(&hd->arch.mapping_lock);
-        AMD_IOMMU_DEBUG("Root table alloc failed, dfn = %"PRI_dfn"\n",
-                        dfn_x(dfn));
-        domain_crash(d);
-        return rc;
-    }
-
-    /* Since HVM domain is initialized with 2 level IO page table,
-     * we might need a deeper page table for wider dfn now */
-    if ( is_hvm_domain(d) )
-    {
-        if ( update_paging_mode(d, dfn_x(dfn)) )
-        {
-            spin_unlock(&hd->arch.mapping_lock);
-            AMD_IOMMU_DEBUG("Update page mode failed dfn = %"PRI_dfn"\n",
-                            dfn_x(dfn));
-            domain_crash(d);
-            return -EFAULT;
-        }
+        return -ENODATA;
     }
 
     if ( iommu_pde_from_dfn(d, dfn_x(dfn), pt_mfn, true) || (pt_mfn[1] == 0) )
@@ -468,6 +449,48 @@ int amd_iommu_unmap_page(struct domain *
 
     return 0;
 }
+
+int amd_iommu_notify_dfn(struct domain *d, dfn_t dfn)
+{
+    struct domain_iommu *hd = dom_iommu(d);
+    int rc;
+
+    ASSERT(is_hvm_domain(d));
+
+    /*
+     * Since HVM domain is initialized with 2 level IO page table,
+     * we might need a deeper page table for wider dfn now.
+     */
+    pcidevs_lock();
+    spin_lock(&hd->arch.mapping_lock);
+
+    rc = amd_iommu_alloc_root(hd);
+    if ( rc )
+    {
+        spin_unlock(&hd->arch.mapping_lock);
+        pcidevs_unlock();
+        AMD_IOMMU_DEBUG("Root table alloc failed, dfn = %"PRI_dfn" (rc %d)\n",
+                        dfn_x(dfn), rc);
+        domain_crash(d);
+        return rc;
+    }
+
+    rc = update_paging_mode(d, dfn_x(dfn));
+    if ( rc )
+    {
+        spin_unlock(&hd->arch.mapping_lock);
+        pcidevs_unlock();
+        AMD_IOMMU_DEBUG("Update paging mode failed dfn %"PRI_dfn" (rc %d)\n",
+                        dfn_x(dfn), rc);
+        domain_crash(d);
+        return rc;
+    }
+
+    spin_unlock(&hd->arch.mapping_lock);
+    pcidevs_unlock();
+
+    return 0;
+}
 
 static unsigned long flush_count(unsigned long dfn, unsigned int page_count,
                                  unsigned int order)
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -638,6 +638,7 @@ static const struct iommu_ops __initcons
     .teardown = amd_iommu_domain_destroy,
     .map_page = amd_iommu_map_page,
     .unmap_page = amd_iommu_unmap_page,
+    .notify_dfn = amd_iommu_notify_dfn,
     .iotlb_flush = amd_iommu_flush_iotlb_pages,
     .iotlb_flush_all = amd_iommu_flush_iotlb_all,
     .free_page_table = deallocate_page_table,
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -61,6 +61,7 @@ int __must_check amd_iommu_map_page(stru
 int __must_check amd_iommu_unmap_page(struct domain *d, dfn_t dfn,
                                       unsigned int *flush_flags);
 int __must_check amd_iommu_alloc_root(struct domain_iommu *hd);
+int __must_check amd_iommu_notify_dfn(struct domain *d, dfn_t dfn);
 int amd_iommu_reserve_domain_unity_map(struct domain *domain,
                                        paddr_t phys_addr, unsigned long size,
                                        int iw, int ir);


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[Xen-devel] [PATCH v3 3/3] gnttab: don't expose host physical address without need

Posted by Jan Beulich 1 week ago
Translated domains shouldn't see host physical addresses. While the
address is also not supposed to be handed back even to non-translated
domains when GNTMAP_device_map is not set (as explicitly stated by a
comment in the public header), PV kernels (Linux at least) assume the
field to get populated nevertheless. (Similarly mapkind() should check
only GNTMAP_device_map.)

Along these lines split the paging mode related check near the top of
map_grant_ref() to handle the "external" and "translated" cases
separately (GNTMAP_device_map use getting tied to being non-translated
rather than non-external), and make the assignment of ->dev_bus_addr
conditional upon the guest being a non-translated one.

Still along these lines in the unmapping case there's no point checking
->dev_bus_addr when GNTMAP_device_map isn't set (and hence the field
isn't going to be consumed).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
v3: New.

--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -938,21 +938,29 @@ map_grant_ref(
     }
 
     if ( unlikely(paging_mode_external(ld) &&
-                  (op->flags & (GNTMAP_device_map|GNTMAP_application_map|
-                            GNTMAP_contains_pte))) )
+                  (op->flags & (GNTMAP_application_map|GNTMAP_contains_pte))) )
     {
-        gdprintk(XENLOG_INFO, "No device mapping in HVM domain\n");
+        gdprintk(XENLOG_INFO, "No application mapping in HVM domain\n");
         op->status = GNTST_general_error;
         return;
     }
 
-    if ( paging_mode_translate(ld) && (op->flags & GNTMAP_host_map) &&
-         (rc = notify_gfn(ld, gaddr_to_gfn(op->host_addr))) )
+    if ( paging_mode_translate(ld) )
     {
-        gdprintk(XENLOG_INFO, "notify(%"PRI_gfn") -> %d\n",
-                 gfn_x(gaddr_to_gfn(op->host_addr)), rc);
-        op->status = GNTST_general_error;
-        return;
+        if ( unlikely((op->flags & GNTMAP_device_map)) )
+        {
+            gdprintk(XENLOG_INFO, "No device mapping in translated domain\n");
+            op->status = GNTST_general_error;
+            return;
+        }
+
+        if ( unlikely(rc = notify_gfn(ld, gaddr_to_gfn(op->host_addr))) )
+        {
+            gdprintk(XENLOG_INFO, "notify(%"PRI_gfn") -> %d\n",
+                     gfn_x(gaddr_to_gfn(op->host_addr)), rc);
+            op->status = GNTST_general_error;
+            return;
+        }
         BUILD_BUG_ON(GNTST_okay);
     }
 
@@ -1201,7 +1209,8 @@ map_grant_ref(
     if ( need_iommu )
         double_gt_unlock(lgt, rgt);
 
-    op->dev_bus_addr = mfn_to_maddr(mfn);
+    op->dev_bus_addr = paging_mode_translate(ld) ? op->host_addr
+                                                 : mfn_to_maddr(mfn);
     op->handle       = handle;
     op->status       = GNTST_okay;
 
@@ -1382,7 +1391,7 @@ unmap_common(
 
     op->mfn = act->mfn;
 
-    if ( op->dev_bus_addr &&
+    if ( op->dev_bus_addr && (flags & GNTMAP_device_map) &&
          unlikely(op->dev_bus_addr != mfn_to_maddr(act->mfn)) )
         PIN_FAIL(act_release_out, GNTST_general_error,
                  "Bus address doesn't match gntref (%"PRIx64" != %"PRIpaddr")\n",


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