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Re: [vfio-users] Far Cry Primal



Thanks, I guess the "issue" is only from the blizzard games. It could very well be that this is used as some anti-tamper tool in these blizzard games, but I find it odd that it only does this in Win10 and that returning 0 doesn't cause a problem. 

On Tue, Jun 14, 2016 at 12:06 PM Jayme Howard <g prime gmail com> wrote:
I've only seen it call them at startup.  After playing for an hour or so, I didn't see more of them in my dmesg output.

On Tue, Jun 14, 2016 at 9:38 AM, Abdulla Bubshait <darkstego gmail com> wrote:
For what its worth it seems Rise of the Tomb Raider also calls it, so it might be Denuvo.

The interesting thing is Rise of the Tomb Raider only calls it once. So there is no performance issue. Heroes and Starcraft continuously make these calls which causes the performance issue.

Can anyone confirm if Doom only calls up the MSRS in one spot or does it constantly keep calling the MSRS throughout the game?

On Tue, Jun 14, 2016 at 8:55 AM thibaut noah <thibaut noah gmail com> wrote:
They have the warden which is constantly checking your system

2016-06-14 14:36 GMT+02:00 Jayme Howard <g prime gmail com>:
I don't think Blizzard uses Denuvo.

On Tue, Jun 14, 2016 at 7:29 AM, thibaut noah <thibaut noah gmail com> wrote:
That might also have to do with denuvo protection 

2016-06-14 9:49 GMT+02:00 Abdulla Bubshait <darkstego gmail com>:
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 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 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 gmail com> wrote:


On Mon, Jun 13, 2016 at 6:27 PM, Jayme Howard <g prime 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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