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Re: [PATCH v2 1/3] x86/vmx: implement Bus Lock detection
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Jun 2022 08:54:15 +0200
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- Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 07 Jun 2022 06:54:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.06.2022 15:27, Andrew Cooper wrote:
> On 26/05/2022 12:11, Roger Pau Monne wrote:
>> diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
>> index f08a00dcbb..476ab72463 100644
>> --- a/xen/arch/x86/hvm/vmx/vmx.c
>> +++ b/xen/arch/x86/hvm/vmx/vmx.c
>> @@ -4065,6 +4065,16 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
>>
>> if ( unlikely(exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) )
>> return vmx_failed_vmentry(exit_reason, regs);
>> + if ( unlikely(exit_reason & VMX_EXIT_REASONS_BUS_LOCK) )
>> + {
>> + /*
>> + * Delivery of Bus Lock VM exit was pre-empted by a higher priority
>> VM
>> + * exit.
>> + */
>> + exit_reason &= ~VMX_EXIT_REASONS_BUS_LOCK;
>> + if ( exit_reason != EXIT_REASON_BUS_LOCK )
>> + perfc_incr(buslock);
>> + }
>
> I know this post-dates you posting v2, but given the latest update from
> Intel, VMX_EXIT_REASONS_BUS_LOCK will be set on all exits.
Mind me asking what "latest update" you're referring to? Neither SDM nor
ISE have seen a recent update, afaict.
Jan
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