inal Message-
From: Andrew Cooper
Sent: Monday, January 27, 2025 6:42 AM
To: Oleksii Kurochko ; Xen-devel
Cc: Katz, Jonathan ; Jan Beulich
; Roger Pau Monné
Subject: Re: [PATCH for-4.20] x86/intel: Fix PERF_GLOBAL fixup when
virtualised
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-Original Message-
From: Andrew Cooper
Sent: Monday, January 27, 2025 6:42 AM
To: Oleksii Kurochko ; Xen-devel
Cc: Katz, Jonathan ; Jan Beulich ;
Roger Pau Monné
Subject: Re: [PATCH for-4.20] x8
On 21/01/2025 4:57 pm, Oleksii Kurochko wrote:
>
> On 1/21/25 3:25 PM, Andrew Cooper wrote:
>> Logic using performance counters needs to look at
>> MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
>>
>> When virtualised under ESX, Xen dies with a #GP fault trying to read
>> MSR_C
On 1/21/25 3:25 PM, Andrew Cooper wrote:
Logic using performance counters needs to look at
MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
When virtualised under ESX, Xen dies with a #GP fault trying to read
MSR_CORE_PERF_GLOBAL_CTRL.
Factor this logic out into a separate
On Tue, Jan 21, 2025 at 02:25:10PM +, Andrew Cooper wrote:
> Logic using performance counters needs to look at
> MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
>
> When virtualised under ESX, Xen dies with a #GP fault trying to read
> MSR_CORE_PERF_GLOBAL_CTRL.
>
> Factor
On 21/01/2025 3:58 pm, Jan Beulich wrote:
> On 21.01.2025 16:23, Andrew Cooper wrote:
>> On 21/01/2025 3:03 pm, Jan Beulich wrote:
>>> On 21.01.2025 15:25, Andrew Cooper wrote:
+ !(val & MSR_IA32_MISC_ENABLE_PERF_AVAIL) )
+return;
+
+eax = cpuid_eax(10);
On 21.01.2025 16:23, Andrew Cooper wrote:
> On 21/01/2025 3:03 pm, Jan Beulich wrote:
>> On 21.01.2025 15:25, Andrew Cooper wrote:
>>> Logic using performance counters needs to look at
>>> MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
>>>
>>> When virtualised under ESX, Xen di
On 21/01/2025 3:03 pm, Jan Beulich wrote:
> On 21.01.2025 15:25, Andrew Cooper wrote:
>> Logic using performance counters needs to look at
>> MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
>>
>> When virtualised under ESX, Xen dies with a #GP fault trying to read
>> MSR_CORE_PE
On 21.01.2025 15:25, Andrew Cooper wrote:
> Logic using performance counters needs to look at
> MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
>
> When virtualised under ESX, Xen dies with a #GP fault trying to read
> MSR_CORE_PERF_GLOBAL_CTRL.
>
> Factor this logic out into
Logic using performance counters needs to look at
MSR_MISC_ENABLE.PERF_AVAILABLE before touching any other resources.
When virtualised under ESX, Xen dies with a #GP fault trying to read
MSR_CORE_PERF_GLOBAL_CTRL.
Factor this logic out into a separate function (it's already too squashed to
the RH
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