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