Messages in this thread Patch in this message | | | From | Suravee Suthikulpanit <> | Subject | [PATCH v6 10/17] KVM: x86: nSVM: always intercept x2apic msrs | Date | Thu, 19 May 2022 05:27:02 -0500 |
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From: Maxim Levitsky <mlevitsk@redhat.com>
As a preparation for x2avic, this patch ensures that x2apic msrs are always intercepted for the nested guest.
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> --- arch/x86/kvm/svm/nested.c | 5 +++++ arch/x86/kvm/svm/svm.h | 9 +++++++++ 2 files changed, 14 insertions(+)
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index f209c1ca540c..b61f8939c210 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -230,6 +230,11 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) break; p = msrpm_offsets[i]; + + /* x2apic msrs are intercepted always for the nested guest */ + if (is_x2apic_msrpm_offset(p)) + continue; + offset = svm->nested.ctl.msrpm_base_pa + (p * 4); if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 16f1d117c98b..7e53474c8834 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -517,6 +517,15 @@ static inline bool nested_npt_enabled(struct vcpu_svm *svm) return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; } +static inline bool is_x2apic_msrpm_offset(u32 offset) +{ + /* 4 msrs per u8, and 4 u8 in u32 */ + u32 msr = offset * 16; + + return (msr >= APIC_BASE_MSR) && + (msr < (APIC_BASE_MSR + 0x100)); +} + /* svm.c */ #define MSR_INVALID 0xffffffffU -- 2.25.1
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