KVM: SVM: Define sev_features and VMPL field in the VMSA

The hypervisor uses the sev_features field (offset 3B0h) in the Save State
Area to control the SEV-SNP guest features such as SNPActive, vTOM,
ReflectVC etc. An SEV-SNP guest can read the sev_features field through
the SEV_STATUS MSR.

While at it, update dump_vmcb() to log the VMPL level.

See APM2 Table 15-34 and B-4 for more details.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Link: https://lore.kernel.org/r/20220307213356.2797205-2-brijesh.singh@amd.com

diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index f70a510..f2d01f3 100644 (file)
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -282,7 +282,8 @@ struct vmcb_save_area {
        struct vmcb_seg ldtr;
        struct vmcb_seg idtr;
        struct vmcb_seg tr;
-       u8 reserved_1[43];
+       u8 reserved_1[42];
+       u8 vmpl;
        u8 cpl;
        u8 reserved_2[4];
        u64 efer;
@@ -347,7 +348,8 @@ struct vmcb_save_area {
        u64 sw_exit_info_1;
        u64 sw_exit_info_2;
        u64 sw_scratch;
-       u8 reserved_11[56];
+       u64 sev_features;
+       u8 reserved_11[48];
        u64 xcr0;
        u8 valid_bitmap[16];
        u64 x87_state_gpa;

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index bd4c64b..81cb518 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3117,8 +3117,8 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
               "tr:",
               save01->tr.selector, save01->tr.attrib,
               save01->tr.limit, save01->tr.base);
-       pr_err("cpl:            %d                efer:         %016llx\n",
-               save->cpl, save->efer);
+       pr_err("vmpl: %d   cpl:  %d               efer:          %016llx\n",
+              save->vmpl, save->cpl, save->efer);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "cr0:", save->cr0, "cr2:", save->cr2);
        pr_err("%-15s %016llx %-13s %016llx\n",