Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cc70e7374df1e3a56d718e8ca330619f316511a6
Commit: cc70e7374df1e3a56d718e8ca330619f316511a6
Parent: c22e3514fceb2f514093ce1d19a2f660ac7347ae
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 15:12:24 2007 +0200
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 17:52:52 2008 +0200
KVM: MMU: Disable write access on clean large pages
By forcing clean huge pages to be read-only, we have separate roles
for the shadow of a clean large page and the shadow of a dirty large
page. This is necessary because different ptes will be instantiated
for the two cases, even for read faults.
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
drivers/kvm/paging_tmpl.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index e07cb2e..4538b15 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -382,6 +382,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
metaphysical = 1;
hugepage_access = walker->pte;
hugepage_access &= PT_USER_MASK | PT_WRITABLE_MASK;
+ if (!is_dirty_pte(walker->pte))
+ hugepage_access &= ~PT_WRITABLE_MASK;
hugepage_access >>= PT_WRITABLE_SHIFT;
if (walker->pte & PT64_NX_MASK)
hugepage_access |= (1 << 2);
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
