From: Avi Kivity <avi@qumranet.com>
Date: Thu, 6 Aug 2009 17:39:44 +0000 (-0300)
Subject: KVM: Allocate guest memory as MAP_PRIVATE, not MAP_SHARED
X-Git-Tag: v2.6.27.32~41
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f897f01e79c99ec8577ed6bb6c9bec845747dc3c;p=thirdparty%2Fkernel%2Fstable.git

KVM: Allocate guest memory as MAP_PRIVATE, not MAP_SHARED

(cherry picked from commit acee3c04e8208c17aad1baff99baa68d71640a19)

There is no reason to share internal memory slots with fork()ed instances.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a29b440b3c242..8d45d35f8aad3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4003,7 +4003,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
 			userspace_addr = do_mmap(NULL, 0,
 						 npages * PAGE_SIZE,
 						 PROT_READ | PROT_WRITE,
-						 MAP_SHARED | MAP_ANONYMOUS,
+						 MAP_PRIVATE | MAP_ANONYMOUS,
 						 0);
 			up_write(&current->mm->mmap_sem);