|
|
![](http://www.xen.org/images/globals/pixel.gif) |
|
|
|
|
|
|
|
xen-changelog
[Xen-changelog] [xen-unstable] x86 ept: ignore guest writes to read only
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1256289232 -3600
# Node ID e36ffdd9e8cf2ce70abcb07e99ad90d8919a2649
# Parent 6bb2ea81491620e6aabbebed2da99ffd77da53b0
x86 ept: ignore guest writes to read only memory regions or memory
holes in EPT.
This patch prevents domain crash when running memtest86 with EPT.
Signed-off-by: Xin Li <xin.li@xxxxxxxxx>
---
xen/arch/x86/hvm/vmx/vmx.c | 11 +++++++++++
1 files changed, 11 insertions(+)
diff -r 6bb2ea814916 -r e36ffdd9e8cf xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Fri Oct 23 10:13:22 2009 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Fri Oct 23 10:13:52 2009 +0100
@@ -2184,6 +2184,17 @@ static void ept_handle_violation(unsigne
return;
}
+ /* Ignore writes to:
+ * 1. read only memory regions;
+ * 2. memory holes. */
+ if ( (qualification & EPT_WRITE_VIOLATION)
+ && (((gla_validity == EPT_GLA_VALIDITY_MATCH) && (t == p2m_ram_ro))
+ || (mfn_x(mfn) == INVALID_MFN)) ) {
+ int inst_len = __get_instruction_length();
+ __update_guest_eip(inst_len);
+ return;
+ }
+
/* Everything else is an error. */
gla = __vmread(GUEST_LINEAR_ADDRESS);
gdprintk(XENLOG_ERR, "EPT violation %#lx (%c%c%c/%c%c%c), "
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
<Prev in Thread] |
Current Thread |
[Next in Thread> |
- [Xen-changelog] [xen-unstable] x86 ept: ignore guest writes to read only memory regions or memory,
Xen patchbot-unstable <=
|
|
|
|
|