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From: Yang Weijiang <weijiang.yang@intel.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	pbonzini@redhat.com, jmattson@google.com,
	sean.j.christopherson@intel.com
Cc: yu.c.zhang@linux.intel.com, alazar@bitdefender.com,
	edwin.zhai@intel.com, Yang Weijiang <weijiang.yang@intel.com>
Subject: [PATCH v8 02/10] vmx: spp: Add control flags for Sub-Page Protection(SPP)
Date: Sat, 30 Nov 2019 01:27:01 +0800
Message-ID: <20191129172709.11347-3-weijiang.yang@intel.com> (raw)
In-Reply-To: <20191129172709.11347-1-weijiang.yang@intel.com>

Check SPP capability in MSR_IA32_VMX_PROCBASED_CTLS2, its 23-bit
indicates SPP capability. Enable SPP feature bit in CPU capabilities
bitmap if it's supported.

Co-developed-by: He Chen <he.chen@linux.intel.com>
Signed-off-by: He Chen <he.chen@linux.intel.com>
Co-developed-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
 arch/x86/include/asm/vmx.h      | 1 +
 arch/x86/kvm/mmu.h              | 2 ++
 arch/x86/kvm/vmx/capabilities.h | 5 +++++
 arch/x86/kvm/vmx/vmx.c          | 9 +++++++++
 4 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index a39136b0d509..e1137807affc 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -68,6 +68,7 @@
 #define SECONDARY_EXEC_XSAVES			0x00100000
 #define SECONDARY_EXEC_PT_USE_GPA		0x01000000
 #define SECONDARY_EXEC_MODE_BASED_EPT_EXEC	0x00400000
+#define SECONDARY_EXEC_ENABLE_SPP		0x00800000
 #define SECONDARY_EXEC_TSC_SCALING              0x02000000
 
 #define PIN_BASED_EXT_INTR_MASK                 0x00000001
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 54c2a377795b..3c1423526a98 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -26,6 +26,8 @@
 #define PT_PAGE_SIZE_MASK (1ULL << PT_PAGE_SIZE_SHIFT)
 #define PT_PAT_MASK (1ULL << 7)
 #define PT_GLOBAL_MASK (1ULL << 8)
+#define PT_SPP_SHIFT 61
+#define PT_SPP_MASK (1ULL << PT_SPP_SHIFT)
 #define PT64_NX_SHIFT 63
 #define PT64_NX_MASK (1ULL << PT64_NX_SHIFT)
 
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index d6664ee3d127..e3bde7a32123 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -241,6 +241,11 @@ static inline bool cpu_has_vmx_pml(void)
 	return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_PML;
 }
 
+static inline bool cpu_has_vmx_ept_spp(void)
+{
+	return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_SPP;
+}
+
 static inline bool vmx_xsaves_supported(void)
 {
 	return vmcs_config.cpu_based_2nd_exec_ctrl &
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c030c96fc81a..9d1a7e624c5b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -60,6 +60,7 @@
 #include "vmcs12.h"
 #include "vmx.h"
 #include "x86.h"
+#include "../mmu/spp.h"
 
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
@@ -113,6 +114,7 @@ module_param_named(pml, enable_pml, bool, S_IRUGO);
 
 static bool __read_mostly dump_invalid_vmcs = 0;
 module_param(dump_invalid_vmcs, bool, 0644);
+static bool __read_mostly spp_supported = 0;
 
 #define MSR_BITMAP_MODE_X2APIC		1
 #define MSR_BITMAP_MODE_X2APIC_APICV	2
@@ -2279,6 +2281,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 			SECONDARY_EXEC_RDSEED_EXITING |
 			SECONDARY_EXEC_RDRAND_EXITING |
 			SECONDARY_EXEC_ENABLE_PML |
+			SECONDARY_EXEC_ENABLE_SPP |
 			SECONDARY_EXEC_TSC_SCALING |
 			SECONDARY_EXEC_PT_USE_GPA |
 			SECONDARY_EXEC_PT_CONCEAL_VMX |
@@ -3931,6 +3934,9 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
 	if (!enable_pml)
 		exec_control &= ~SECONDARY_EXEC_ENABLE_PML;
 
+	if (!spp_supported)
+		exec_control &= ~SECONDARY_EXEC_ENABLE_SPP;
+
 	if (vmx_xsaves_supported()) {
 		/* Exposing XSAVES only when XSAVE is exposed */
 		bool xsaves_enabled =
@@ -7521,6 +7527,9 @@ static __init int hardware_setup(void)
 	if (!cpu_has_vmx_flexpriority())
 		flexpriority_enabled = 0;
 
+	if (cpu_has_vmx_ept_spp() && enable_ept)
+		spp_supported = 1;
+
 	if (!cpu_has_virtual_nmis())
 		enable_vnmi = 0;
 
-- 
2.17.2


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 17:26 [PATCH v8 00/10] Enable Sub-Page Write Protection Support Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 01/10] Documentation: Introduce EPT based Subpage Protection and related APIs Yang Weijiang
2019-11-29 17:27 ` Yang Weijiang [this message]
2019-11-29 17:27 ` [PATCH v8 03/10] mmu: spp: Add SPP Table setup functions Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 04/10] mmu: spp: Add functions to operate SPP access bitmap Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 05/10] x86: spp: Introduce user-space SPP IOCTLs Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 06/10] vmx: spp: Set up SPP paging table at vmentry/vmexit Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 07/10] mmu: spp: Enable Lazy mode SPP protection Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 08/10] mmu: spp: Handle SPP protected pages when VM memory changes Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 09/10] x86: spp: Add SPP protection check in emulation Yang Weijiang
2019-11-29 17:27 ` [PATCH v8 10/10] kvm: selftests: selftest for Sub-Page protection Yang Weijiang

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