[PATCH Part1 RFC v4 16/36] KVM: SVM: define new SEV_FEATURES field in the VMCB Save State Area
From: Brijesh Singh <hidden>
Date: 2021-07-07 18:17:32
Also in:
kvm, linux-coco, linux-efi, linux-mm, lkml, platform-driver-x86
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 fields through the SEV_STATUS MSR. While at it, update the dump_vmcb() to log the VMPL level. See APM2 Table 15-34 and B-4 for more details. Signed-off-by: Brijesh Singh <redacted> --- arch/x86/include/asm/svm.h | 15 +++++++++++++-- arch/x86/kvm/svm/svm.c | 4 ++-- 2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 772e60efe243..ff614cdcf628 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h@@ -212,6 +212,15 @@ struct __attribute__ ((__packed__)) vmcb_control_area { #define SVM_NESTED_CTL_SEV_ENABLE BIT(1) #define SVM_NESTED_CTL_SEV_ES_ENABLE BIT(2) +#define SVM_SEV_FEATURES_SNP_ACTIVE BIT(0) +#define SVM_SEV_FEATURES_VTOM BIT(1) +#define SVM_SEV_FEATURES_REFLECT_VC BIT(2) +#define SVM_SEV_FEATURES_RESTRICTED_INJECTION BIT(3) +#define SVM_SEV_FEATURES_ALTERNATE_INJECTION BIT(4) +#define SVM_SEV_FEATURES_DEBUG_SWAP BIT(5) +#define SVM_SEV_FEATURES_PREVENT_HOST_IBS BIT(6) +#define SVM_SEV_FEATURES_BTB_ISOLATION BIT(7) + struct vmcb_seg { u16 selector; u16 attrib;
@@ -230,7 +239,8 @@ 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;
@@ -295,7 +305,8 @@ 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 e088086f3de6..293c9e03da5a 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c@@ -3184,8 +3184,8 @@ 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",
--
2.17.1