linux-kernel - [PATCH 36/50] KVM: MMU: When updating the dirty bit, inform the mmu about it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1198421495-31481-37-git-send-email-avi@qumranet.com>
Date:	Sun, 23 Dec 2007 16:51:21 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net
Subject: [PATCH 36/50] KVM: MMU: When updating the dirty bit, inform the mmu about it

Since the mmu uses different shadow pages for dirty large pages and clean
large pages, this allows the mmu to drop ptes that are now invalid.

Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 drivers/kvm/paging_tmpl.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index a0f84a5..a9e687b 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -74,9 +74,14 @@ static void FNAME(update_dirty_bit)(struct kvm_vcpu *vcpu,
 				    pt_element_t *ptep,
 				    gfn_t table_gfn)
 {
+	gpa_t pte_gpa;
+
 	if (write_fault && !is_dirty_pte(*ptep)) {
 		mark_page_dirty(vcpu->kvm, table_gfn);
 		*ptep |= PT_DIRTY_MASK;
+		pte_gpa = ((gpa_t)table_gfn << PAGE_SHIFT);
+		pte_gpa += offset_in_page(ptep);
+		kvm_mmu_pte_write(vcpu, pte_gpa, (u8 *)ptep, sizeof(*ptep));
 	}
 }
 
-- 
1.5.3.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/