[RFC v2 1/7] KVM: VMX: Introduce PKS VMCS fields

[Chenyi Qiang]

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.qi...@intel.com>
Reviewed-by: Jim Mattson <jmatt...@google.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