From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm@vger.kernel.org
Cc: Avi Kivity <avi@redhat.com>
Subject: kvm: make --mem-path memory allocation depend on mmu notifiers
Date: Tue, 13 Jan 2009 18:36:17 -0200 [thread overview]
Message-ID: <20090113203617.GA8671@amt.cnet> (raw)
Without mmu notifiers usage of hugepages to back guest memory can cause
memory corruption.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/qemu/vl.c b/qemu/vl.c
index d0660ab..49cf066 100644
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -4664,6 +4664,11 @@ void *alloc_mem_area(size_t memory, unsigned long *len, const char *path)
void *area;
int fd;
+ if (!kvm_has_sync_mmu()) {
+ fprintf(stderr, "host lacks mmu notifiers, disabling --mem-path\n");
+ return NULL;
+ }
+
if (asprintf(&filename, "%s/kvm.XXXXXX", path) == -1)
return NULL;
next reply other threads:[~2009-01-13 20:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-13 20:36 Marcelo Tosatti [this message]
2009-01-13 20:38 ` kvm: make --mem-path memory allocation depend on mmu notifiers Anthony Liguori
2009-01-13 20:50 ` Marcelo Tosatti
2009-01-13 20:57 ` David S. Ahern
2009-01-14 0:07 ` Marcelo Tosatti
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