From: Avi Kivity <avi@qumranet.com>
Date: Tue, 26 Aug 2008 14:22:47 +0000 (+0300)
Subject: KVM: Allocate guest memory as MAP_PRIVATE, not MAP_SHARED
X-Git-Tag: firefly_0821_release~17377^2~65
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=acee3c04e8208c17aad1baff99baa68d71640a19;p=firefly-linux-kernel-4.4.55.git

KVM: Allocate guest memory as MAP_PRIVATE, not MAP_SHARED

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

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

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bfc7c332c5d7..675d010995a2 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);