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authorJim Mattson <jmattson@google.com>2019-09-19 15:59:17 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2019-09-24 16:15:36 +0200
commit0cb8410b90e78948984f35f2c4d50c2c0b7ee675 (patch)
treecb5d969265a447aee40b5b7756b084127889e945 /arch/x86/kvm/svm.c
parenta06dcd625d6181747fac7f4c140b5a4c397a778c (diff)
downloadlinux-0cb8410b90e78948984f35f2c4d50c2c0b7ee675.tar.bz2
kvm: svm: Intercept RDPRU
The RDPRU instruction gives the guest read access to the IA32_APERF MSR and the IA32_MPERF MSR. According to volume 3 of the APM, "When virtualization is enabled, this instruction can be intercepted by the Hypervisor. The intercept bit is at VMCB byte offset 10h, bit 14." Since we don't enumerate the instruction in KVM_SUPPORTED_CPUID, intercept it and synthesize #UD. Signed-off-by: Jim Mattson <jmattson@google.com> Reviewed-by: Drew Schmitt <dasch@google.com> Reviewed-by: Jacob Xu <jacobhxu@google.com> Reviewed-by: Peter Shier <pshier@google.com> Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
-rw-r--r--arch/x86/kvm/svm.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ce75296b1b10..f8ecb6df5106 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1540,6 +1540,7 @@ static void init_vmcb(struct vcpu_svm *svm)
set_intercept(svm, INTERCEPT_SKINIT);
set_intercept(svm, INTERCEPT_WBINVD);
set_intercept(svm, INTERCEPT_XSETBV);
+ set_intercept(svm, INTERCEPT_RDPRU);
set_intercept(svm, INTERCEPT_RSM);
if (!kvm_mwait_in_guest(svm->vcpu.kvm)) {
@@ -3832,6 +3833,12 @@ static int xsetbv_interception(struct vcpu_svm *svm)
return 1;
}
+static int rdpru_interception(struct vcpu_svm *svm)
+{
+ kvm_queue_exception(&svm->vcpu, UD_VECTOR);
+ return 1;
+}
+
static int task_switch_interception(struct vcpu_svm *svm)
{
u16 tss_selector;
@@ -4783,6 +4790,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_MONITOR] = monitor_interception,
[SVM_EXIT_MWAIT] = mwait_interception,
[SVM_EXIT_XSETBV] = xsetbv_interception,
+ [SVM_EXIT_RDPRU] = rdpru_interception,
[SVM_EXIT_NPF] = npf_interception,
[SVM_EXIT_RSM] = rsm_interception,
[SVM_EXIT_AVIC_INCOMPLETE_IPI] = avic_incomplete_ipi_interception,