linux-kernel - [PATCH v2 4/7] KVM:CPUID: Fix xsaves area size calculation for CPUID.(EAX=0xD,ECX=1).

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Message-Id: <20190122205909.24165-5-weijiang.yang@intel.com>
Date:   Wed, 23 Jan 2019 04:59:06 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, jmattson@...gle.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org, mst@...hat.com,
        yu-cheng.yu@...el.com, yi.z.zhang@...el.com, hjl.tools@...il.com
Cc:     weijiang.yang@...el.com, Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Subject: [PATCH v2 4/7] KVM:CPUID: Fix xsaves area size calculation for CPUID.(EAX=0xD,ECX=1).

According to latest Software Development Manual vol.2/3.2,
for CPUID.(EAX=0xD,ECX=1), it should report xsaves area size
containing all states enabled  by XCR0|IA32_MSR_XSS.

Signed-off-by: Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 arch/x86/kvm/cpuid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index dbeb4e7904eb..67b464d1d749 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -136,7 +136,8 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu)
 
 	best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
 	if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))
-		best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
+		best->ebx = xstate_required_size(vcpu->arch.xcr0 |
+			    kvm_supported_xss(), true);
 
 	/*
 	 * The existing code assumes virtual address is 48-bit or 57-bit in the
-- 
2.17.1