From: Vishal Annapurve <vannapurve@xxxxxxxxxx> This change adds handling of HVA ranges to copy contents to private memory while doing sev launch update data. mem_attr array is updated during LAUNCH_UPDATE_DATA to ensure that encrypted memory is marked as private. Signed-off-by: Vishal Annapurve <vannapurve@xxxxxxxxxx> [mdr: use gfn_to_hva_memslot_prot() for shared GFN handler to deal with read-only slots for ROMs] Signed-off-by: Michael Roth <michael.roth@xxxxxxx> --- arch/x86/kvm/svm/sev.c | 99 ++++++++++++++++++++++++++++++++++++---- include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 27 ++++++++--- 3 files changed, 111 insertions(+), 16 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 69dbf17f0d6a..a7e4e3005786 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -493,23 +493,26 @@ static unsigned long get_num_contig_pages(unsigned long idx, return pages; } -static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) +static int sev_launch_update_shared_gfn_handler(struct kvm *kvm, + struct kvm_gfn_range *range, + struct kvm_sev_cmd *argp) { unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i; struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; - struct kvm_sev_launch_update_data params; struct sev_data_launch_update_data data; struct page **inpages; int ret; - if (!sev_guest(kvm)) - return -ENOTTY; - - if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) - return -EFAULT; + vaddr = gfn_to_hva_memslot_prot(range->slot, range->start, NULL); + pr_debug("%s: shared GFN: %llx, slot.id: %d, slot.base_gfn: %llx, slot.userspace_addr: %lx, slot.flags: %x, vaddr: %lx\n", + __func__, range->start, range->slot->id, range->slot->base_gfn, + range->slot->userspace_addr, range->slot->flags, vaddr); + if (kvm_is_error_hva(vaddr)) { + pr_err("vaddr is erroneous 0x%lx\n", vaddr); + return -EINVAL; + } - vaddr = params.uaddr; - size = params.len; + size = (range->end - range->start) << PAGE_SHIFT; vaddr_end = vaddr + size; /* Lock the user memory. */ @@ -561,6 +564,84 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +static int sev_launch_update_priv_gfn_handler(struct kvm *kvm, + struct kvm_gfn_range *range, + struct kvm_sev_cmd *argp) +{ + struct sev_data_launch_update_data data; + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + gfn_t gfn; + kvm_pfn_t pfn; + struct kvm_memory_slot *memslot = range->slot; + int ret = 0; + + data.reserved = 0; + data.handle = sev->handle; + + for (gfn = range->start; gfn < range->end; gfn++) { + int order; + void *kvaddr; + + ret = kvm_restricted_mem_get_pfn(memslot, gfn, &pfn, &order); + if (ret) + return ret; + + kvaddr = pfn_to_kaddr(pfn); + if (!virt_addr_valid(kvaddr)) { + pr_err("Invalid kvaddr 0x%llx\n", (uint64_t)kvaddr); + ret = -EINVAL; + goto e_ret; + } + + ret = kvm_read_guest_page(kvm, gfn, kvaddr, 0, PAGE_SIZE); + if (ret) { + pr_err("guest read failed 0x%x\n", ret); + goto e_ret; + } + + if (!this_cpu_has(X86_FEATURE_SME_COHERENT)) + clflush_cache_range(kvaddr, PAGE_SIZE); + + data.len = PAGE_SIZE; + data.address = __sme_set(pfn << PAGE_SHIFT); + ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, &data, &argp->error); + if (ret) + goto e_ret; + kvm_release_pfn_clean(pfn); + } + kvm_vm_set_region_attr(kvm, range->start, range->end, + true /* priv_attr */); + +e_ret: + return ret; +} + +static int sev_launch_update_gfn_handler(struct kvm *kvm, struct kvm_gfn_range *range, + void *data) +{ + struct kvm_sev_cmd *argp = (struct kvm_sev_cmd *)data; + + if (kvm_slot_can_be_private(range->slot)) + return sev_launch_update_priv_gfn_handler(kvm, range, argp); + + return sev_launch_update_shared_gfn_handler(kvm, range, argp); +} + +static int sev_launch_update_data(struct kvm *kvm, + struct kvm_sev_cmd *argp) +{ + struct kvm_sev_launch_update_data params; + + if (!sev_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) + return -EFAULT; + + return kvm_vm_do_hva_range_op(kvm, params.uaddr, params.uaddr + params.len, + sev_launch_update_gfn_handler, argp); +} + static int sev_es_sync_vmsa(struct vcpu_svm *svm) { struct sev_es_save_area *save = svm->sev_es.vmsa; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 21a539ab17f6..33fa0b1435d3 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -973,6 +973,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, void kvm_exit(void); void kvm_get_kvm(struct kvm *kvm); +int kvm_vm_set_region_attr(struct kvm *kvm, gfn_t start, gfn_t end, u64 attributes); bool kvm_get_kvm_safe(struct kvm *kvm); void kvm_put_kvm(struct kvm *kvm); bool file_is_kvm(struct file *file); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 4ff7adaf6c56..1343070657d1 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -747,6 +747,7 @@ int kvm_vm_do_hva_range_op(struct kvm *kvm, unsigned long hva_start, return ret; } +EXPORT_SYMBOL_GPL(kvm_vm_do_hva_range_op); static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn, unsigned long start, @@ -2595,12 +2596,28 @@ static void kvm_unmap_mem_range(struct kvm *kvm, gfn_t start, gfn_t end, kvm_flush_remote_tlbs(kvm); } +int kvm_vm_set_region_attr(struct kvm *kvm, gfn_t start, gfn_t end, + u64 attributes) +{ + gfn_t index; + void *entry; + + entry = attributes ? xa_mk_value(attributes) : NULL; + + for (index = start; index < end; index++) + if (xa_err(xa_store(&kvm->mem_attr_array, index, entry, + GFP_KERNEL_ACCOUNT))) + break; + + return index; +} +EXPORT_SYMBOL_GPL(kvm_vm_set_region_attr); + static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm, struct kvm_memory_attributes *attrs) { gfn_t start, end; unsigned long i; - void *entry; int idx; u64 supported_attrs = kvm_supported_mem_attributes(kvm); @@ -2617,8 +2634,6 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm, start = attrs->address >> PAGE_SHIFT; end = (attrs->address + attrs->size - 1 + PAGE_SIZE) >> PAGE_SHIFT; - entry = attrs->attributes ? xa_mk_value(attrs->attributes) : NULL; - if (kvm_arch_has_private_mem(kvm)) { KVM_MMU_LOCK(kvm); kvm_mmu_invalidate_begin(kvm); @@ -2627,10 +2642,7 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm, } mutex_lock(&kvm->lock); - for (i = start; i < end; i++) - if (xa_err(xa_store(&kvm->mem_attr_array, i, entry, - GFP_KERNEL_ACCOUNT))) - break; + i = kvm_vm_set_region_attr(kvm, start, end, attrs->attributes); mutex_unlock(&kvm->lock); if (kvm_arch_has_private_mem(kvm)) { @@ -2793,6 +2805,7 @@ unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, return hva; } +EXPORT_SYMBOL_GPL(gfn_to_hva_memslot_prot); unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) { -- 2.25.1