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KVM: VMX: Handle vmx instruction vmexits 

IF a guest tries to use vmx instructions, inject a #UD to let it know the
instruction is not implemented, rather than crashing.

This prevents guest userspace from crashing the guest kernel.

Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2009-06-16 14:19:52 +03:00
parent ef50f7ac7e
commit e3c7cb6ad7
1 changed files with 15 additions and 0 deletions
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15
arch/x86/kvm/vmx.c
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@ -3012,6 +3012,12 @@ static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
return 1;
}
static int handle_vmx_insn(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@ -3198,6 +3204,15 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
[EXIT_REASON_HLT] = handle_halt,
[EXIT_REASON_INVLPG] = handle_invlpg,
[EXIT_REASON_VMCALL] = handle_vmcall,
[EXIT_REASON_VMCLEAR] = handle_vmx_insn,
[EXIT_REASON_VMLAUNCH] = handle_vmx_insn,
[EXIT_REASON_VMPTRLD] = handle_vmx_insn,
[EXIT_REASON_VMPTRST] = handle_vmx_insn,
[EXIT_REASON_VMREAD] = handle_vmx_insn,
[EXIT_REASON_VMRESUME] = handle_vmx_insn,
[EXIT_REASON_VMWRITE] = handle_vmx_insn,
[EXIT_REASON_VMOFF] = handle_vmx_insn,
[EXIT_REASON_VMON] = handle_vmx_insn,
[EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
[EXIT_REASON_APIC_ACCESS] = handle_apic_access,
[EXIT_REASON_WBINVD] = handle_wbinvd,