linux-kernel - Re: [CFT PATCH 0/2] KVM: support XSAVES usage in the host

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Message-Id: <DE9192FA-6A22-4AEB-88C2-AE17DA503685@gmail.com>
Date:	Sun, 23 Nov 2014 10:16:20 +0200
From:	Nadav Amit <nadav.amit@...il.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
Subject: Re: [CFT PATCH 0/2] KVM: support XSAVES usage in the host

I’ll try to check it tomorrow (I don’t have access to the failing machine at the moment).

Thanks for the quick response.

Nadav

> On Nov 21, 2014, at 20:31, Paolo Bonzini <pbonzini@...hat.com> wrote:
> 
> The first patch ensures that XSAVES is not exposed in the guest until
> we emulate MSR_IA32_XSS.  The second exports XSAVE data in the correct
> format.
> 
> I tested these on a non-XSAVES system so they should not be completely
> broken, but I need some help.  I am not even sure which XSAVE states
> are _not_ enabled, and thus compacted, in Linux.
> 
> Note that these patches do not add support for XSAVES in the guest yet,
> since MSR_IA32_XSS is not emulated.
> 
> If they fix the bug Nadav reported, I'll add Reported-by and commit.
> 
> Thanks,
> 
> Paolo
> 
> Paolo Bonzini (2):
>  kvm: x86: mask out XSAVES
>  KVM: x86: support XSAVES usage in the host
> 
> arch/x86/kvm/cpuid.c | 11 ++++++++++-
> arch/x86/kvm/x86.c   | 48 +++++++++++++++++++++++++++++++++++++++++++-----
> 2 files changed, 53 insertions(+), 6 deletions(-)
> 
> -- 
> 1.8.3.1
> 
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