From: Avi Kivity <avi@qumranet.com>
Date: Thu, 11 Oct 2007 13:30:21 +0000 (+0200)
Subject: KVM: MMU: When updating the dirty bit, inform the mmu about it
X-Git-Tag: firefly_0821_release~23631^2~213
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c4fcc2724628c6548748ec80a90b548fc300e81f;p=firefly-linux-kernel-4.4.55.git

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@qumranet.com>
---

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index a0f84a5379a4..a9e687b5c1e9 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));
 	}
 }