From: Uri Lublin <uril@qumranet.com>
Date: Thu, 22 Feb 2007 15:37:32 +0000 (+0200)
Subject: KVM: Remove write access permissions when dirty-page-logging is enabled
X-Git-Tag: v2.6.21-rc3~106
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ff990d5952712c2e163b355946c39278da8407a8;p=linux-2.6-omap-h63xx.git

KVM: Remove write access permissions when dirty-page-logging is enabled

Enabling dirty page logging is done using KVM_SET_MEMORY_REGION ioctl.
If the memory region already exists, we need to remove write accesses,
so writes will be caught, and dirty pages will be logged.

Signed-off-by: Uri Lublin <uril@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index be7694db285..e48b4d7a350 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -748,6 +748,8 @@ raced:
 		vcpu = vcpu_load_slot(kvm, i);
 		if (!vcpu)
 			continue;
+		if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
+			do_remove_write_access(vcpu, mem->slot);
 		kvm_mmu_reset_context(vcpu);
 		vcpu_put(vcpu);
 	}