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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2013-01-13 19:49:07 +0400 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2013-01-22 04:58:33 +0400 |
| commit | 93c05d3ef25275829d421a255271595ac219a518 (patch) | |
| tree | b987097751977ca63bd9a9ef53956cd0d14127c3 /arch/x86/include/asm/kvm_host.h | |
| parent | 95b3cf69bdf8b27a02d878e24ca353cebb4e009e (diff) | |
| download | linux-93c05d3ef25275829d421a255271595ac219a518.tar.xz | |
KVM: x86: improve reexecute_instruction
The current reexecute_instruction can not well detect the failed instruction
emulation. It allows guest to retry all the instructions except it accesses
on error pfn
For example, some cases are nested-write-protect - if the page we want to
write is used as PDE but it chains to itself. Under this case, we should
stop the emulation and report the case to userspace
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index f75e1feb6ec5..77d56a4ba89c 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -497,6 +497,13 @@ struct kvm_vcpu_arch { u64 msr_val; struct gfn_to_hva_cache data; } pv_eoi; + + /* + * Indicate whether the access faults on its page table in guest + * which is set when fix page fault and used to detect unhandeable + * instruction. + */ + bool write_fault_to_shadow_pgtable; }; struct kvm_lpage_info { |