linux-kernel - [PATCH v7 1/8] KVM: VMX: Introduce PKS VMCS fields

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Message-Id: <20220424101557.134102-2-lei4.wang@intel.com>
Date:   Sun, 24 Apr 2022 03:15:50 -0700
From:   Lei Wang <lei4.wang@...el.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org
Cc:     lei4.wang@...el.com, chenyi.qiang@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v7 1/8] KVM: VMX: Introduce PKS VMCS fields

From: Chenyi Qiang <chenyi.qiang@...el.com>

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 domain.

Two VMCS fields {HOST,GUEST}_IA32_PKRS are introduced in
{host,guest}-state area to store the respective values 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>
Reviewed-by: Jim Mattson <jmattson@...gle.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 0ffaa3156a4e..7962d506ba91 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -95,6 +95,7 @@
 #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
 
@@ -108,6 +109,7 @@
 #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
 
@@ -245,12 +247,16 @@ 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,
-- 
2.25.1