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From: Yang Weijiang <weijiang.yang@intel.com>
To: pbonzini@redhat.com, sean.j.christopherson@intel.com,
	mst@redhat.com, rkrcmar@redhat.com, jmattson@google.com,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	yu-cheng.yu@intel.com
Cc: weijiang.yang@intel.com
Subject: [PATCH v5 8/8] KVM: x86: Add user-space access interface for CET MSRs
Date: Wed, 22 May 2019 15:01:01 +0800	[thread overview]
Message-ID: <20190522070101.7636-9-weijiang.yang@intel.com> (raw)
In-Reply-To: <20190522070101.7636-1-weijiang.yang@intel.com>

There're two different places storing Guest CET states, the states
managed with XSAVES/XRSTORS, as restored/saved
in previous patch, can be read/write directly from/to the MSRs.
For those stored in VMCS fields, they're access via vmcs_read/
vmcs_write.

Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
 arch/x86/include/asm/msr-index.h |  2 ++
 arch/x86/kvm/vmx/vmx.c           | 43 ++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index dc0a67c1ed80..53a4ef337846 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -827,6 +827,8 @@
 #define MSR_IA32_U_CET		0x6a0 /* user mode cet setting */
 #define MSR_IA32_S_CET		0x6a2 /* kernel mode cet setting */
 #define MSR_IA32_PL0_SSP	0x6a4 /* kernel shstk pointer */
+#define MSR_IA32_PL1_SSP	0x6a5 /* ring 1 shstk pointer */
+#define MSR_IA32_PL2_SSP	0x6a6 /* ring 2 shstk pointer */
 #define MSR_IA32_PL3_SSP	0x6a7 /* user shstk pointer */
 #define MSR_IA32_INT_SSP_TAB	0x6a8 /* exception shstk table */
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index dec6bda20235..233f58af3878 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1777,6 +1777,27 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		else
 			msr_info->data = vmx->pt_desc.guest.addr_a[index / 2];
 		break;
+	case MSR_IA32_S_CET:
+		msr_info->data = vmcs_readl(GUEST_S_CET);
+		break;
+	case MSR_IA32_U_CET:
+		rdmsrl(MSR_IA32_U_CET, msr_info->data);
+		break;
+	case MSR_IA32_INT_SSP_TAB:
+		msr_info->data = vmcs_readl(GUEST_INTR_SSP_TABLE);
+		break;
+	case MSR_IA32_PL0_SSP:
+		rdmsrl(MSR_IA32_PL0_SSP, msr_info->data);
+		break;
+	case MSR_IA32_PL1_SSP:
+		rdmsrl(MSR_IA32_PL1_SSP, msr_info->data);
+		break;
+	case MSR_IA32_PL2_SSP:
+		rdmsrl(MSR_IA32_PL2_SSP, msr_info->data);
+		break;
+	case MSR_IA32_PL3_SSP:
+		rdmsrl(MSR_IA32_PL3_SSP, msr_info->data);
+		break;
 	case MSR_TSC_AUX:
 		if (!msr_info->host_initiated &&
 		    !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP))
@@ -2012,6 +2033,28 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		else
 			vmx->pt_desc.guest.addr_a[index / 2] = data;
 		break;
+	case MSR_IA32_S_CET:
+		vmcs_writel(GUEST_S_CET, data);
+		break;
+	case MSR_IA32_U_CET:
+		wrmsrl(MSR_IA32_U_CET, data);
+		break;
+	case MSR_IA32_INT_SSP_TAB:
+		vmcs_writel(GUEST_INTR_SSP_TABLE, data);
+		break;
+	case MSR_IA32_PL0_SSP:
+		wrmsrl(MSR_IA32_PL0_SSP, data);
+		break;
+	case MSR_IA32_PL1_SSP:
+		wrmsrl(MSR_IA32_PL1_SSP, data);
+		break;
+	case MSR_IA32_PL2_SSP:
+		wrmsrl(MSR_IA32_PL2_SSP, data);
+		break;
+	case MSR_IA32_PL3_SSP:
+		wrmsrl(MSR_IA32_PL3_SSP, data);
+		break;
+
 	case MSR_TSC_AUX:
 		if (!msr_info->host_initiated &&
 		    !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP))
-- 
2.17.2


      parent reply	other threads:[~2019-05-22  7:02 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-22  7:00 [PATCH v5 0/8] Introduce support for Guest CET feature Yang Weijiang
2019-05-22  7:00 ` [PATCH v5 1/8] KVM: VMX: Define CET VMCS fields and control bits Yang Weijiang
2019-06-04 14:46   ` Sean Christopherson
2019-06-05  2:30     ` Yang Weijiang
2019-05-22  7:00 ` [PATCH v5 2/8] KVM: x86: Implement CET CPUID support for Guest Yang Weijiang
2019-06-04 19:58   ` Sean Christopherson
2019-06-05  2:51     ` Yang Weijiang
2019-05-22  7:00 ` [PATCH v5 3/8] KVM: x86: Fix XSAVE size calculation issue Yang Weijiang
2019-05-22  7:00 ` [PATCH v5 4/8] KVM: VMX: Pass through CET related MSRs to Guest Yang Weijiang
2019-06-04 19:59   ` Sean Christopherson
2019-05-22  7:00 ` [PATCH v5 5/8] KVM: VMX: Load Guest CET via VMCS when CET is enabled in Guest Yang Weijiang
2019-06-04 20:03   ` Sean Christopherson
2019-06-05  1:49     ` Yang Weijiang
2019-05-22  7:00 ` [PATCH v5 6/8] KVM: x86: Allow Guest to set supported bits in XSS Yang Weijiang
2019-05-22  7:01 ` [PATCH v5 7/8] KVM: x86: Load Guest fpu state when accessing MSRs managed by XSAVES Yang Weijiang
2019-05-22  7:01 ` Yang Weijiang [this message]

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