[vfio-users] Far Cry Primal

[Abdulla Bubshait]

Yes, this is a win10 issue.
Changing the Virtual CPU model does not make a difference. Each model has
its own LBR register address, but one will be called.

The only thing I have not tried is using an AMD processor. AMD CPUs support
lbrv which is virtualization of the LBR registers, so it is handled in
hardware rather than software.
If anyone has an AMD CPU and a win10 VM willing to confirm if their setup
does indeed work in these games, that would be great.

On Tue, Jun 14, 2016 at 3:39 AM Ivan Volosyuk <ivan.volosyuk at gmail.com>
wrote:

> 2 things:
>  - this msrs are not called from StarCraft on Win8.1.
>  - i wonder if forcing virtual CPU model to something older will disable
> them in Win10.
>
> This msrs issue is what holds me off upgrade to W10.
>
> On Tue, Jun 14, 2016 at 12:39 PM Jayme Howard <g.prime at gmail.com> wrote:
>
>> For what it's worth, I believe I was getting them on Overwatch as well.
>> It's not happening with EVERY game I have though.
>>
>> On Mon, Jun 13, 2016 at 8:28 PM, Abdulla Bubshait <darkstego at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Mon, Jun 13, 2016 at 6:27 PM, Jayme Howard <g.prime at gmail.com> wrote:
>>> > That's the output for Doom.
>>> >
>>> > [1639445.044855] kvm [9487]: vcpu2 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.044861] kvm [9487]: vcpu2 ignored rdmsr: 0x1c9
>>> > [1639445.044862] kvm [9487]: vcpu2 ignored rdmsr: 0x680
>>> > [1639445.044863] kvm [9487]: vcpu2 ignored rdmsr: 0x6c0
>>> > [1639445.044890] kvm [9487]: vcpu1 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.044895] kvm [9487]: vcpu1 ignored rdmsr: 0x1c9
>>> > [1639445.044896] kvm [9487]: vcpu1 ignored rdmsr: 0x680
>>> > [1639445.044897] kvm [9487]: vcpu1 ignored rdmsr: 0x6c0
>>> > [1639445.044905] kvm [9487]: vcpu1 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.044907] kvm [9487]: vcpu1 ignored rdmsr: 0x1c9
>>> > [1639445.044908] kvm [9487]: vcpu1 ignored rdmsr: 0x680
>>> > [1639445.044909] kvm [9487]: vcpu1 ignored rdmsr: 0x6c0
>>> > [1639445.046195] kvm [9487]: vcpu2 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.046198] kvm [9487]: vcpu2 ignored rdmsr: 0x1c9
>>> > [1639445.046204] kvm [9487]: vcpu2 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.155114] kvm [9487]: vcpu0 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> > [1639445.155123] kvm [9487]: vcpu0 kvm_set_msr_common:
>>> MSR_IA32_DEBUGCTLMSR
>>> > 0x1, nop
>>> >
>>>
>>> Odd, this is another game that is contantly reading the LBR. I initially
>>> thought this was part of the StarCraft 2 and Heroes of the Storm code. But
>>> now I think this might be part of Windows 10. Something being called by
>>> these games is causing a ton of LBR reads. Maybe DX 12?
>>>
>>> I think if we can find what is causing these reads in the games we might
>>> be able to solve it. Because if this is the case we might be getting more
>>> and more games with performance problems because of these LBR checks.
>>>
>>
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>
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