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[Xen-devel] [PATCH] Xen missing prompt log when exec-sp=off
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jin Nan Wang <jnwang@xxxxxxxx>
- Date: Mon, 16 Dec 2019 05:47:48 +0000
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jin Nan Wang <jnwang@xxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 16 Dec 2019 05:55:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHVs9RYvDJGD9d8eEizxnHO4Wu68w==
- Thread-topic: [PATCH] Xen missing prompt log when exec-sp=off
Fix a issue when user disable ETP exec-sp, xen missed a prompt
log in dmesg.
Signed-off-by: James Wang <jnwang@xxxxxxxx>
---
xen/arch/x86/hvm/vmx/vmx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 7970ba93e1..9c1f0f645d 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2499,7 +2499,9 @@ const struct hvm_function_table * __init start_vmx(void)
{
/* Default to non-executable superpages on vulnerable hardware. */
opt_ept_exec_sp = !cpu_has_bug_pschange_mc;
-
+ }
+ if (opt_ept_exec_sp == false)
+ {
if ( cpu_has_bug_pschange_mc )
printk("VMX: Disabling executable EPT superpages due to
CVE-2018-12207\n");
}
--
2.24.0
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