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| author | Krish Sadhukhan <krish.sadhukhan@oracle.com> | 2021-09-20 19:51:31 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-01 03:44:57 -0400 |
| commit | 174a921b6975ef959dd82ee9e8844067a62e3ec1 (patch) | |
| tree | 4cfba7bd3de397e87fd2b25123ac040df3f70107 /arch/x86/kvm/svm/nested.c | |
| parent | 78b497f2e62d8c7514de5f83c80837bbb120e93e (diff) | |
| download | linux-174a921b6975ef959dd82ee9e8844067a62e3ec1.tar.gz | |
nSVM: Check for reserved encodings of TLB_CONTROL in nested VMCB
According to section "TLB Flush" in APM vol 2,
"Support for TLB_CONTROL commands other than the first two, is
optional and is indicated by CPUID Fn8000_000A_EDX[FlushByAsid].
All encodings of TLB_CONTROL not defined in the APM are reserved."
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <20210920235134.101970-3-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/nested.c')
| -rw-r--r-- | arch/x86/kvm/svm/nested.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 31fd4bd334c2..f8b7bc04b3e7 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -238,6 +238,18 @@ static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size) kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1); } +static bool nested_svm_check_tlb_ctl(struct kvm_vcpu *vcpu, u8 tlb_ctl) +{ + /* Nested FLUSHBYASID is not supported yet. */ + switch(tlb_ctl) { + case TLB_CONTROL_DO_NOTHING: + case TLB_CONTROL_FLUSH_ALL_ASID: + return true; + default: + return false; + } +} + static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu, struct vmcb_control_area *control) { @@ -257,6 +269,9 @@ static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu, IOPM_SIZE))) return false; + if (CC(!nested_svm_check_tlb_ctl(vcpu, control->tlb_ctl))) + return false; + return true; } |