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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-10-02 16:06:15 +0200 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-10-03 12:29:07 +0300 |
| commit | d7876f1be40a16223a44355740de625849504eb5 (patch) | |
| tree | 33e0f69e36fd042139eb490745515c466a1685d2 /arch/x86/kvm/x86.c | |
| parent | 647e23bb333ff196e7be8ae08c842d855fb850f6 (diff) | |
| download | lwn-d7876f1be40a16223a44355740de625849504eb5.tar.gz lwn-d7876f1be40a16223a44355740de625849504eb5.zip | |
KVM: x86: prevent setting unsupported XSAVE states
A guest can still attempt to save and restore XSAVE states even if they
have been masked in CPUID leaf 0Dh. This usually is not visible to
the guest, but is still wrong: "Any attempt to set a reserved bit (as
determined by the contents of EAX and EDX after executing CPUID with
EAX=0DH, ECX= 0H) in XCR0 for a given processor will result in a #GP
exception".
The patch also performs the same checks as __kvm_set_xcr in KVM_SET_XSAVE.
This catches migration from newer to older kernel/processor before the
guest starts running.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 187f824b1454..7d5c5207a414 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -586,7 +586,7 @@ int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) return 1; if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE)) return 1; - if (xcr0 & ~host_xcr0) + if (xcr0 & ~vcpu->arch.guest_supported_xcr0) return 1; kvm_put_guest_xcr0(vcpu); vcpu->arch.xcr0 = xcr0; @@ -3003,10 +3003,19 @@ static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, u64 xstate_bv = *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; - if (cpu_has_xsave) + if (cpu_has_xsave) { + /* + * Here we allow setting states that are not present in + * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility + * with old userspace. + */ + if (xstate_bv & ~KVM_SUPPORTED_XCR0) + return -EINVAL; + if (xstate_bv & ~host_xcr0) + return -EINVAL; memcpy(&vcpu->arch.guest_fpu.state->xsave, guest_xsave->region, xstate_size); - else { + } else { if (xstate_bv & ~XSTATE_FPSSE) return -EINVAL; memcpy(&vcpu->arch.guest_fpu.state->fxsave, @@ -6940,6 +6949,9 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) vcpu->arch.ia32_tsc_adjust_msr = 0x0; vcpu->arch.pv_time_enabled = false; + + vcpu->arch.guest_supported_xcr0 = 0; + kvm_async_pf_hash_reset(vcpu); kvm_pmu_init(vcpu); |