linux-kernel - [PATCH 03/15] x86/feat_ctl: Add new VMX feature, Tertiary VM-Execution control and LOADIWKEY Exiting

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Message-Id: <1622537274-146420-4-git-send-email-robert.hu@linux.intel.com>
Date:   Tue,  1 Jun 2021 16:47:42 +0800
From:   Robert Hoo <robert.hu@...ux.intel.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        chang.seok.bae@...el.com, robert.hu@...el.com,
        robert.hu@...ux.intel.com
Subject: [PATCH 03/15] x86/feat_ctl: Add new VMX feature, Tertiary VM-Execution control and LOADIWKEY Exiting

There is a new VMX capability MSR IA32_VMX_PROCBASED_CTLS3.

All 64 bits of this MSR define capability bits for the new tertiary VM-Exec
control so two new 32-bit vmx_feature leaves are needed to record all the
capabilities.

The 2 new VMX features:
Tertiary VM-Execution control is enumerated by bit 17 of existing Primary
VM-Execution control.
LOADIWKEY Exiting is enumerated by bit 0 of this new tertiary VM-Exec
control, which designates if guest running 'loadiwkey' instruction will
cause VM-Exit.

Signed-off-by: Robert Hoo <robert.hu@...ux.intel.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/msr-index.h   | 1 +
 arch/x86/include/asm/vmxfeatures.h | 6 +++++-
 arch/x86/kernel/cpu/feat_ctl.c     | 9 +++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index f8e7878..dd103c2 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -915,6 +915,7 @@
 #define MSR_IA32_VMX_TRUE_EXIT_CTLS      0x0000048f
 #define MSR_IA32_VMX_TRUE_ENTRY_CTLS     0x00000490
 #define MSR_IA32_VMX_VMFUNC             0x00000491
+#define MSR_IA32_VMX_PROCBASED_CTLS3    0x00000492
 
 /* VMX_BASIC bits and bitmasks */
 #define VMX_BASIC_VMCS_SIZE_SHIFT	32
diff --git a/arch/x86/include/asm/vmxfeatures.h b/arch/x86/include/asm/vmxfeatures.h
index d9a7468..c0b2f63 100644
--- a/arch/x86/include/asm/vmxfeatures.h
+++ b/arch/x86/include/asm/vmxfeatures.h
@@ -5,7 +5,7 @@
 /*
  * Defines VMX CPU feature bits
  */
-#define NVMXINTS			3 /* N 32-bit words worth of info */
+#define NVMXINTS			5 /* N 32-bit words worth of info */
 
 /*
  * Note: If the comment begins with a quoted string, that string is used
@@ -43,6 +43,7 @@
 #define VMX_FEATURE_RDTSC_EXITING	( 1*32+ 12) /* "" VM-Exit on RDTSC */
 #define VMX_FEATURE_CR3_LOAD_EXITING	( 1*32+ 15) /* "" VM-Exit on writes to CR3 */
 #define VMX_FEATURE_CR3_STORE_EXITING	( 1*32+ 16) /* "" VM-Exit on reads from CR3 */
+#define VMX_FEATURE_TER_CONTROLS        (1*32 + 17) /* "" Enable Tertiary VM-Execution Controls */
 #define VMX_FEATURE_CR8_LOAD_EXITING	( 1*32+ 19) /* "" VM-Exit on writes to CR8 */
 #define VMX_FEATURE_CR8_STORE_EXITING	( 1*32+ 20) /* "" VM-Exit on reads from CR8 */
 #define VMX_FEATURE_VIRTUAL_TPR		( 1*32+ 21) /* "vtpr" TPR virtualization, a.k.a. TPR shadow */
@@ -85,4 +86,7 @@
 #define VMX_FEATURE_ENCLV_EXITING	( 2*32+ 28) /* "" VM-Exit on ENCLV (leaf dependent) */
 #define VMX_FEATURE_BUS_LOCK_DETECTION	( 2*32+ 30) /* "" VM-Exit when bus lock caused */
 
+/* Tertiary Processor-Based VM-Execution Controls, word 3 */
+#define VMX_FEATURE_LOADIWKEY_EXITING	(3*32 +  0) /* "" VM-Exit on LOADIWKey */
+
 #endif /* _ASM_X86_VMXFEATURES_H */
diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c
index da696eb..2e0272d 100644
--- a/arch/x86/kernel/cpu/feat_ctl.c
+++ b/arch/x86/kernel/cpu/feat_ctl.c
@@ -15,6 +15,8 @@ enum vmx_feature_leafs {
 	MISC_FEATURES = 0,
 	PRIMARY_CTLS,
 	SECONDARY_CTLS,
+	TERTIARY_CTLS_LOW,
+	TERTIARY_CTLS_HIGH,
 	NR_VMX_FEATURE_WORDS,
 };
 
@@ -42,6 +44,13 @@ static void init_vmx_capabilities(struct cpuinfo_x86 *c)
 	rdmsr_safe(MSR_IA32_VMX_PROCBASED_CTLS2, &ign, &supported);
 	c->vmx_capability[SECONDARY_CTLS] = supported;
 
+	/*
+	 * For tertiary execution controls MSR, it's actually a 64bit allowed-1.
+	 */
+	rdmsr_safe(MSR_IA32_VMX_PROCBASED_CTLS3, &ign, &supported);
+	c->vmx_capability[TERTIARY_CTLS_LOW] = ign;
+	c->vmx_capability[TERTIARY_CTLS_HIGH] = supported;
+
 	rdmsr(MSR_IA32_VMX_PINBASED_CTLS, ign, supported);
 	rdmsr_safe(MSR_IA32_VMX_VMFUNC, &ign, &funcs);
 
-- 
1.8.3.1