linux-kernel - [RFC 1/7] KVM: VMX: Introduce PKS VMCS fields

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Message-Id: <20200807084841.7112-2-chenyi.qiang@intel.com>
Date:   Fri,  7 Aug 2020 16:48:35 +0800
From:   Chenyi Qiang <chenyi.qiang@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC 1/7] KVM: VMX: Introduce PKS VMCS fields

PKS(Protection Keys for Supervisor Pages) is a feature that extends the
Protection Key architecture to support thread-specific permission
restrictions on supervisor pages.

A new PKS MSR(PKRS) is defined in kernel to support PKS, which holds a
set of permissions associated with each protection domian.

Two VMCS fields {HOST,GUEST}_IA32_PKRS are introduced in
{host,guest}-state area to store the value of PKRS.

Every VM exit saves PKRS into guest-state area.
If VM_EXIT_LOAD_IA32_PKRS = 1, VM exit loads PKRS from the host-state
area.
If VM_ENTRY_LOAD_IA32_PKRS = 1, VM entry loads PKRS from the guest-state
area.

Signed-off-by: Chenyi Qiang <chenyi.qiang@...el.com>
---
 arch/x86/include/asm/vmx.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index cd7de4b401fe..425cf81dd722 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -94,6 +94,7 @@
 #define VM_EXIT_CLEAR_BNDCFGS                   0x00800000
 #define VM_EXIT_PT_CONCEAL_PIP			0x01000000
 #define VM_EXIT_CLEAR_IA32_RTIT_CTL		0x02000000
+#define VM_EXIT_LOAD_IA32_PKRS			0x20000000
 
 #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR	0x00036dff
 
@@ -107,6 +108,7 @@
 #define VM_ENTRY_LOAD_BNDCFGS                   0x00010000
 #define VM_ENTRY_PT_CONCEAL_PIP			0x00020000
 #define VM_ENTRY_LOAD_IA32_RTIT_CTL		0x00040000
+#define VM_ENTRY_LOAD_IA32_PKRS			0x00400000
 
 #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR	0x000011ff
 
@@ -243,12 +245,16 @@ enum vmcs_field {
 	GUEST_BNDCFGS_HIGH              = 0x00002813,
 	GUEST_IA32_RTIT_CTL		= 0x00002814,
 	GUEST_IA32_RTIT_CTL_HIGH	= 0x00002815,
+	GUEST_IA32_PKRS			= 0x00002818,
+	GUEST_IA32_PKRS_HIGH		= 0x00002819,
 	HOST_IA32_PAT			= 0x00002c00,
 	HOST_IA32_PAT_HIGH		= 0x00002c01,
 	HOST_IA32_EFER			= 0x00002c02,
 	HOST_IA32_EFER_HIGH		= 0x00002c03,
 	HOST_IA32_PERF_GLOBAL_CTRL	= 0x00002c04,
 	HOST_IA32_PERF_GLOBAL_CTRL_HIGH	= 0x00002c05,
+	HOST_IA32_PKRS			= 0x00002c06,
+	HOST_IA32_PKRS_HIGH		= 0x00002c07,
 	PIN_BASED_VM_EXEC_CONTROL       = 0x00004000,
 	CPU_BASED_VM_EXEC_CONTROL       = 0x00004002,
 	EXCEPTION_BITMAP                = 0x00004004,
-- 
2.17.1