diff options
| author | Xiao Guangrong <guangrong.xiao@linux.intel.com> | 2016-02-24 17:51:12 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-03 14:36:22 +0100 |
| commit | e5691a81e830c12d396b3f219ab999be87a1208f (patch) | |
| tree | b916b2799982fa81d5f01dda0f48360263691f61 /arch/x86/kvm/paging_tmpl.h | |
| parent | 3d0c27ad6ee465f174b09ee99fcaf189c57d567a (diff) | |
KVM: MMU: clear write-flooding on the fast path of tracked page
If the page fault is caused by write access on write tracked page, the
real shadow page walking is skipped, we lost the chance to clear write
flooding for the page structure current vcpu is using
Fix it by locklessly waking shadow page table to clear write flooding
on the shadow page structure out of mmu-lock. So that we change the
count to atomic_t
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 52ae2d94cc9e..4174cf290fa3 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -728,8 +728,10 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, return 0; } - if (page_fault_handle_page_track(vcpu, error_code, walker.gfn)) + if (page_fault_handle_page_track(vcpu, error_code, walker.gfn)) { + shadow_page_table_clear_flood(vcpu, addr); return 1; + } vcpu->arch.write_fault_to_shadow_pgtable = false; |