From: Tom Lendacky Date: Thu, 10 Dec 2020 17:10:04 +0000 (-0600) Subject: KVM: SVM: Set the encryption mask for the SVM host save area X-Git-Tag: microblaze-v5.12~53^2~8 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=85ca8be938c0e693b5ed5392279d5ecedf42901e;p=linux-2.6-microblaze.git KVM: SVM: Set the encryption mask for the SVM host save area The SVM host save area is used to restore some host state on VMEXIT of an SEV-ES guest. After allocating the save area, clear it and add the encryption mask to the SVM host save area physical address that is programmed into the VM_HSAVE_PA MSR. Signed-off-by: Tom Lendacky Message-Id: Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index c3006e9ef5ae..0e922741023b 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -30,7 +30,6 @@ unsigned int max_sev_asid; static unsigned int min_sev_asid; static unsigned long *sev_asid_bitmap; static unsigned long *sev_reclaim_asid_bitmap; -#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) struct enc_region { struct list_head list; diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 2e43f79c2703..4be7d13d4462 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -497,7 +497,7 @@ static int svm_hardware_enable(void) wrmsrl(MSR_EFER, efer | EFER_SVME); - wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT); + wrmsrl(MSR_VM_HSAVE_PA, __sme_page_pa(sd->save_area)); if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) { wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT); @@ -565,6 +565,7 @@ static int svm_cpu_init(int cpu) sd->save_area = alloc_page(GFP_KERNEL); if (!sd->save_area) goto free_cpu_data; + clear_page(page_address(sd->save_area)); if (svm_sev_enabled()) { sd->sev_vmcbs = kmalloc_array(max_sev_asid + 1, diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index b3f03dede6ac..b85c162a8a1e 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -21,6 +21,8 @@ #include +#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) + static const u32 host_save_user_msrs[] = { #ifdef CONFIG_X86_64 MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,