KVM: SEV-ES: Use V_TSC_AUX if available instead of RDTSC/MSR_TSC_AUX intercepts

The TSC_AUX virtualization feature allows AMD SEV-ES guests to securely use
TSC_AUX (auxiliary time stamp counter data) in the RDTSCP and RDPID
instructions. The TSC_AUX value is set using the WRMSR instruction to the
TSC_AUX MSR (0xC0000103). It is read by the RDMSR, RDTSCP and RDPID
instructions. If the read/write of the TSC_AUX MSR is intercepted, then
RDTSCP and RDPID must also be intercepted when TSC_AUX virtualization
is present. However, the RDPID instruction can't be intercepted. This means
that when TSC_AUX virtualization is present, RDTSCP and TSC_AUX MSR
read/write must not be intercepted for SEV-ES (or SEV-SNP) guests.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Message-Id: <165040164424.1399644.13833277687385156344.stgit@bmoger-ubuntu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 1bc66a1..1d6826e 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -405,7 +405,7 @@
 #define X86_FEATURE_SEV                        (19*32+ 1) /* AMD Secure Encrypted Virtualization */
 #define X86_FEATURE_VM_PAGE_FLUSH      (19*32+ 2) /* "" VM Page Flush MSR is supported */
 #define X86_FEATURE_SEV_ES             (19*32+ 3) /* AMD Secure Encrypted Virtualization - Encrypted State */
-#define X86_FEATURE_V_TSC_AUX          (19*32+ 9) /* Virtual TSC_AUX */
+#define X86_FEATURE_V_TSC_AUX          (19*32+ 9) /* "" Virtual TSC_AUX */
 #define X86_FEATURE_SME_COHERENT       (19*32+10) /* "" AMD hardware-enforced cache coherency */
 
 /*

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 9ce1621..b67ce87 100644 (file)
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2926,6 +2926,14 @@ void sev_es_init_vmcb(struct vcpu_svm *svm)
        set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
        set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
        set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
+
+       if (boot_cpu_has(X86_FEATURE_V_TSC_AUX) &&
+           (guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDTSCP) ||
+            guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDPID))) {
+               set_msr_interception(vcpu, svm->msrpm, MSR_TSC_AUX, 1, 1);
+               if (guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDTSCP))
+                       svm_clr_intercept(svm, INTERCEPT_RDTSCP);
+       }
 }
 
 void sev_es_vcpu_reset(struct vcpu_svm *svm)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 22bbd69..b83af9e 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -99,6 +99,7 @@ static const struct svm_direct_access_msrs {
        { .index = MSR_EFER,                            .always = false },
        { .index = MSR_IA32_CR_PAT,                     .always = false },
        { .index = MSR_AMD64_SEV_ES_GHCB,               .always = true  },
+       { .index = MSR_TSC_AUX,                         .always = false },
        { .index = MSR_INVALID,                         .always = false },
 };
 

diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index e246793..32220a1 100644 (file)
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -29,7 +29,7 @@
 #define        IOPM_SIZE PAGE_SIZE * 3
 #define        MSRPM_SIZE PAGE_SIZE * 2
 
-#define MAX_DIRECT_ACCESS_MSRS 20
+#define MAX_DIRECT_ACCESS_MSRS 21
 #define MSRPM_OFFSETS  16
 extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
 extern bool npt_enabled;