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Re: [Xen-devel] [PATCH] Xen missing prompt log when exec-sp=off


  • To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jin Nan Wang <jnwang@xxxxxxxx>
  • Date: Mon, 16 Dec 2019 07:00:02 +0000
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 16 Dec 2019 07:03:39 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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  • Thread-topic: [PATCH] Xen missing prompt log when exec-sp=off

On 16/12/2019 2:17 pm, Tian, Kevin wrote:
>> From: Jin Nan Wang <jnwang@xxxxxxxx>
>> Sent: Monday, December 16, 2019 1:48 PM
>>
>> 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;
>> -
>> +        }
> no parenthesis then. Just move the comment before the earlier condition
> check
Got it.
>> +        if (opt_ept_exec_sp == false)
>> +        {
>>               if ( cpu_has_bug_pschange_mc )
>>                   printk("VMX: Disabling executable EPT superpages due to 
>> CVE-
>> 2018-12207\n");
>>           }
> Can we do it another way? Always throw out a warning if the hardware
> is vulnerable, plus its enabling status?
OK. Let me try.
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