Commit 85ca8be9 authored by Tom Lendacky's avatar Tom Lendacky Committed by Paolo Bonzini
Browse files

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: default avatarTom Lendacky <thomas.lendacky@amd.com>
Message-Id: <b77aa28af6d7f1a0cb545959e08d6dc75e0c3cba.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4444dfe4

arch/x86/kvm/svm/sev.c

+0 −1
Original line number Diff line number Diff line
@@ -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;

arch/x86/kvm/svm/svm.c

+2 −1
Original line number Diff line number Diff line
@@ -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,

arch/x86/kvm/svm/svm.h

+2 −0
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@ 


#include <asm/svm.h>



#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,

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