linux-kernel - [PATCH 18/18] KVM: X86: Add KVM_CAP_SVM_CPUID

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Date:	Wed, 3 Mar 2010 20:12:21 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 18/18] KVM: X86: Add KVM_CAP_SVM_CPUID_FIXED

This capability shows userspace that is can trust the values
of cpuid[0x8000000A] that it gets from the kernel. Old
behavior was to just return the host cpuid values which is
broken because all additional svm-features need support in
the svm emulation code.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/x86.c  |    1 +
 include/linux/kvm.h |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 53360de..51bad08 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1557,6 +1557,7 @@ int kvm_dev_ioctl_check_extension(long ext)
 	case KVM_CAP_PCI_SEGMENT:
 	case KVM_CAP_DEBUGREGS:
 	case KVM_CAP_X86_ROBUST_SINGLESTEP:
+	case KVM_CAP_SVM_CPUID_FIXED:
 		r = 1;
 		break;
 	case KVM_CAP_COALESCED_MMIO:
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index ce28767..86caf32 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -507,6 +507,7 @@ struct kvm_ioeventfd {
 #define KVM_CAP_DEBUGREGS 50
 #endif
 #define KVM_CAP_X86_ROBUST_SINGLESTEP 51
+#define KVM_CAP_SVM_CPUID_FIXED 52
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
1.7.0


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