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author | Kai Huang <kai.huang@linux.intel.com> | 2015-01-28 10:54:25 +0800 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-01-29 15:31:33 +0100 |
commit | 9b51a63024bd759f97a12f50907b8af23b065b36 (patch) | |
tree | 08cc77c6722f2be119b4b73538ddd7b23ebe9672 /arch/x86/kvm/x86.c | |
parent | f4b4b1808690c37c7c703d43789c1988c5e7fdeb (diff) |
KVM: MMU: Explicitly set D-bit for writable spte.
This patch avoids unnecessary dirty GPA logging to PML buffer in EPT violation
path by setting D-bit manually prior to the occurrence of the write from guest.
We only set D-bit manually in set_spte, and leave fast_page_fault path
unchanged, as fast_page_fault is very unlikely to happen in case of PML.
For the hva <-> pa change case, the spte is updated to either read-only (host
pte is read-only) or be dropped (host pte is writeable), and both cases will be
handled by above changes, therefore no change is necessary.
Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
0 files changed, 0 insertions, 0 deletions