lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

KVM: inject #UD if instruction emulation fails and exit to userspace

Browse Source 
Do not kill VM when instruction emulation fails. Inject #UD and report
failure to userspace instead. Userspace may choose to reenter guest if
vcpu is in userspace (cpl == 3) in which case guest OS will kill
offending process and continue running.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov
2010-05-10 11:16:56 +03:00
committed by Avi Kivity
parent 57bc24cfd6
commit 6d77dbfc88
5 changed files with 26 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/kvm/mmu.c
View File

@ -2814,11 +2814,8 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
return 1;
case EMULATE_DO_MMIO:
++vcpu->stat.mmio_exits;
return 0;
/* fall through */
case EMULATE_FAIL:
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
vcpu->run->internal.ndata = 0;
return 0;
default:
BUG();