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charset="utf-8" From: Yingshiuan Pan The memory protection mechanism performs better with batch operations on memory pages. To leverage this, we pre-allocate memory for VMs that are set to protected mode. As a result, the memory protection mechanism can proactively protect the pre-allocated memory in advance through batch operations, leading to improved performance during VM booting. Signed-off-by: Yingshiuan Pan Co-developed-by: Jerry Wang Signed-off-by: Jerry Wang Signed-off-by: Yi-De Wu Signed-off-by: Liju Chen --- arch/arm64/geniezone/vm.c | 127 ++++++++++++++++++++++++++ include/linux/soc/mediatek/gzvm_drv.h | 1 + 2 files changed, 128 insertions(+) diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c index 00c74a4bcfd7..db16716f5b8d 100644 --- a/arch/arm64/geniezone/vm.c +++ b/arch/arm64/geniezone/vm.c @@ -11,6 +11,8 @@ #include #include "gzvm_arch_common.h" =20 +#define PAR_PA47_MASK GENMASK_ULL(47, 12) + /** * gzvm_hypcall_wrapper() - the wrapper for hvc calls * @a0: arguments passed in registers 0 @@ -201,6 +203,126 @@ static int gzvm_vm_ioctl_get_pvmfw_size(struct gzvm *= gzvm, return 0; } =20 +/** + * fill_constituents() - Populate pa to buffer until full + * @consti: Pointer to struct mem_region_addr_range. + * @consti_cnt: Constituent count. + * @max_nr_consti: Maximum number of constituent count. + * @gfn: Guest frame number. + * @total_pages: Total page numbers. + * @slot: Pointer to struct gzvm_memslot. + * + * Return: how many pages we've fill in, negative if error + */ +static int fill_constituents(struct mem_region_addr_range *consti, + int *consti_cnt, int max_nr_consti, u64 gfn, + u32 total_pages, struct gzvm_memslot *slot) +{ + u64 pfn =3D 0, prev_pfn =3D 0, gfn_end =3D 0; + int nr_pages =3D 0; + int i =3D -1; + + if (unlikely(total_pages =3D=3D 0)) + return -EINVAL; + gfn_end =3D gfn + total_pages; + + while (i < max_nr_consti && gfn < gfn_end) { + if (pfn =3D=3D (prev_pfn + 1)) { + consti[i].pg_cnt++; + } else { + i++; + if (i >=3D max_nr_consti) + break; + consti[i].address =3D PFN_PHYS(pfn); + consti[i].pg_cnt =3D 1; + } + prev_pfn =3D pfn; + gfn++; + nr_pages++; + } + if (i !=3D max_nr_consti) + i++; + *consti_cnt =3D i; + + return nr_pages; +} + +/** + * gzvm_vm_populate_mem_region() - Iterate all mem slot and populate pa to + * buffer until it's full + * @gzvm: Pointer to struct gzvm. + * @slot_id: Memory slot id to be populated. + * + * Return: 0 if it is successful, negative if error + */ +int gzvm_vm_populate_mem_region(struct gzvm *gzvm, int slot_id) +{ + struct gzvm_memslot *memslot =3D &gzvm->memslot[slot_id]; + struct gzvm_memory_region_ranges *region; + int max_nr_consti, remain_pages; + u64 gfn, gfn_end; + u32 buf_size; + + buf_size =3D PAGE_SIZE * 2; + region =3D alloc_pages_exact(buf_size, GFP_KERNEL); + if (!region) + return -ENOMEM; + + max_nr_consti =3D (buf_size - sizeof(*region)) / + sizeof(struct mem_region_addr_range); + + region->slot =3D memslot->slot_id; + remain_pages =3D memslot->npages; + gfn =3D memslot->base_gfn; + gfn_end =3D gfn + remain_pages; + + while (gfn < gfn_end) { + int nr_pages; + + nr_pages =3D fill_constituents(region->constituents, + ®ion->constituent_cnt, + max_nr_consti, gfn, + remain_pages, memslot); + + if (nr_pages < 0) { + pr_err("Failed to fill constituents\n"); + free_pages_exact(region, buf_size); + return -EFAULT; + } + + region->gpa =3D PFN_PHYS(gfn); + region->total_pages =3D nr_pages; + remain_pages -=3D nr_pages; + gfn +=3D nr_pages; + + if (gzvm_arch_set_memregion(gzvm->vm_id, buf_size, + virt_to_phys(region))) { + pr_err("Failed to register memregion to hypervisor\n"); + free_pages_exact(region, buf_size); + return -EFAULT; + } + } + free_pages_exact(region, buf_size); + + return 0; +} + +static int populate_all_mem_regions(struct gzvm *gzvm) +{ + int ret, i; + + for (i =3D 0; i < GZVM_MAX_MEM_REGION; i++) { + if (gzvm->memslot[i].npages =3D=3D 0) + continue; + + ret =3D gzvm_vm_populate_mem_region(gzvm, i); + if (ret !=3D 0) + return ret; + } + + return 0; +} + /** * gzvm_vm_ioctl_cap_pvm() - Proceed GZVM_CAP_PROTECTED_VM's subcommands * @gzvm: Pointer to struct gzvm. @@ -222,6 +344,11 @@ static int gzvm_vm_ioctl_cap_pvm(struct gzvm *gzvm, case GZVM_CAP_PVM_SET_PVMFW_GPA: fallthrough; case GZVM_CAP_PVM_SET_PROTECTED_VM: + /* + * To improve performance for protected VM, we have to populate VM's mem= ory + * before VM booting + */ + populate_all_mem_regions(gzvm); ret =3D gzvm_vm_arch_enable_cap(gzvm, cap, &res); return ret; case GZVM_CAP_PVM_GET_PVMFW_SIZE: diff --git a/include/linux/soc/mediatek/gzvm_drv.h b/include/linux/soc/medi= atek/gzvm_drv.h index 982463eea4f6..54ac91670611 100644 --- a/include/linux/soc/mediatek/gzvm_drv.h +++ b/include/linux/soc/mediatek/gzvm_drv.h @@ -159,6 +159,7 @@ int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm, =20 int gzvm_gfn_to_hva_memslot(struct gzvm_memslot *memslot, u64 gfn, u64 *hva_memslot); +int gzvm_vm_populate_mem_region(struct gzvm *gzvm, int slot_id); =20 int gzvm_vm_ioctl_create_vcpu(struct gzvm *gzvm, u32 cpuid); int gzvm_arch_vcpu_update_one_reg(struct gzvm_vcpu *vcpu, __u64 reg_id, --=20 2.18.0