linux-kernel - [PATCH 29/39] KVM: Allocate guest memory as MAP_PRIVATE, not MAP

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Message-Id: <1222343711-12508-30-git-send-email-avi@redhat.com>
Date:	Thu, 25 Sep 2008 14:55:01 +0300
From:	Avi Kivity <avi@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org, Avi Kivity <avi@...ranet.com>
Subject: [PATCH 29/39] KVM: Allocate guest memory as MAP_PRIVATE, not MAP_SHARED

From: Avi Kivity <avi@...ranet.com>

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

Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 arch/x86/kvm/x86.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bfc7c33..675d010 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4296,7 +4296,7 @@ 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);
 
-- 
1.6.0.1

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