linux-kernel - [CFT PATCH v2 0/2] KVM: support XSAVES usage in the host

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Date:	Mon, 24 Nov 2014 17:43:32 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	wanpeng.li@...ux.intel.com, namit@...technion.ac.il,
	hpa@...ux.intel.com
Subject: [CFT PATCH v2 0/2] KVM: support XSAVES usage in the host

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

v1->v2: also adjust KVM_SET_XSAVE

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   | 87 +++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 90 insertions(+), 8 deletions(-)

-- 
1.8.3.1

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