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KVM: nVMX: propagate errors from prepare_vmcs02 

It is possible that prepare_vmcs02 fails to load the guest state. This
patch adds the proper error handling for such a case. L1 will receive
an INVALID_STATE vmexit with the appropriate exit qualification if it
happens.

A failure to set guest CR3 is the only error propagated from prepare_vmcs02
at the moment.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Ladi Prosek 2016-11-30 16:03:09 +01:00 committed by Paolo Bonzini
parent 7ca29de213
commit ee146c1c10
1 changed files with 19 additions and 4 deletions
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23
arch/x86/kvm/vmx.c
View File

@ -9976,8 +9976,11 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
* needs. In addition to modifying the active vmcs (which is vmcs02), this
* function also has additional necessary side-effects, like setting various
* vcpu->arch fields.
* Returns 0 on success, 1 on failure. Invalid state exit qualification code
* is assigned to entry_failure_code on failure.
*/
static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
unsigned long *entry_failure_code)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 exec_control;
@ -10306,8 +10309,12 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
nested_ept_enabled) {
vcpu->arch.cr3 = vmcs12->guest_cr3;
__set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
} else
kvm_set_cr3(vcpu, vmcs12->guest_cr3);
} else {
if (kvm_set_cr3(vcpu, vmcs12->guest_cr3)) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
return 1;
}
}
kvm_mmu_reset_context(vcpu);
@ -10326,6 +10333,7 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip);
return 0;
}
/*
@ -10340,6 +10348,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
struct loaded_vmcs *vmcs02;
bool ia32e;
u32 msr_entry_idx;
unsigned long exit_qualification;
if (!nested_vmx_check_permission(vcpu))
return 1;
@ -10502,7 +10511,13 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
vmx_segment_cache_clear(vmx);
prepare_vmcs02(vcpu, vmcs12);
if (prepare_vmcs02(vcpu, vmcs12, &exit_qualification)) {
leave_guest_mode(vcpu);
vmx_load_vmcs01(vcpu);
nested_vmx_entry_failure(vcpu, vmcs12,
EXIT_REASON_INVALID_STATE, exit_qualification);
return 1;
}
msr_entry_idx = nested_vmx_load_msr(vcpu,
vmcs12->vm_entry_msr_load_addr,