KVM: x86: Intel MPX vmx and msr handle

From caddc009a6d2019034af8f2346b2fd37a81608d0 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@intel.com>
Date: Mon, 24 Feb 2014 18:11:11 +0800
Subject: [PATCH v5 1/3] KVM: x86: Intel MPX vmx and msr handle

This patch handle vmx and msr of Intel MPX feature.

Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 22 insertions, 2 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0ffe7140d630..e714f8c08ccf 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -764,6 +764,7 @@ struct kvm_x86_ops {
                                struct x86_instruction_info *info,
                                enum x86_intercept_stage stage);
         void (*handle_external_intr)(struct kvm_vcpu *vcpu);
+        bool (*mpx_supported)(void);
 };
 
 struct kvm_arch_async_pf {
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 2067264fb7f5..7004d21e6219 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -85,6 +85,7 @@
 #define VM_EXIT_SAVE_IA32_EFER                  0x00100000
 #define VM_EXIT_LOAD_IA32_EFER                  0x00200000
 #define VM_EXIT_SAVE_VMX_PREEMPTION_TIMER       0x00400000
+#define VM_EXIT_CLEAR_BNDCFGS                   0x00800000
 
 #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR       0x00036dff
 
@@ -95,6 +96,7 @@
 #define VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL     0x00002000
 #define VM_ENTRY_LOAD_IA32_PAT                  0x00004000
 #define VM_ENTRY_LOAD_IA32_EFER                 0x00008000
+#define VM_ENTRY_LOAD_BNDCFGS                   0x00010000
 
 #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR      0x000011ff
 
@@ -174,6 +176,8 @@ enum vmcs_field {
         GUEST_PDPTR2_HIGH               = 0x0000280f,
         GUEST_PDPTR3                    = 0x00002810,
         GUEST_PDPTR3_HIGH               = 0x00002811,
+        GUEST_BNDCFGS                   = 0x00002812,
+        GUEST_BNDCFGS_HIGH              = 0x00002813,
         HOST_IA32_PAT                   = 0x00002c00,
         HOST_IA32_PAT_HIGH              = 0x00002c01,
         HOST_IA32_EFER                  = 0x00002c02,
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index c19fc60ff062..ed821ed45eb6 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -295,6 +295,7 @@
 #define MSR_SMI_COUNT                   0x00000034
 #define MSR_IA32_FEATURE_CONTROL        0x0000003a
 #define MSR_IA32_TSC_ADJUST             0x0000003b
+#define MSR_IA32_BNDCFGS                0x00000d90
 
 #define FEATURE_CONTROL_LOCKED                          (1<<0)
 #define FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX        (1<<1)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a06f101ef64b..e4e4b50f57e6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -441,6 +441,7 @@ struct vcpu_vmx {
 #endif
                 int           gs_ldt_reload_needed;
                 int           fs_reload_needed;
+                u64           msr_host_bndcfgs;
         } host_state;
         struct {
                 int vm86_active;
@@ -1710,6 +1711,8 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
         if (is_long_mode(&vmx->vcpu))
                 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
 #endif
+        if (boot_cpu_has(X86_FEATURE_MPX))
+                rdmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
         for (i = 0; i < vmx->save_nmsrs; ++i)
                 kvm_set_shared_msr(vmx->guest_msrs[i].index,
                                    vmx->guest_msrs[i].data,
@@ -1747,6 +1750,8 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx)
 #ifdef CONFIG_X86_64
         wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
 #endif
+        if (vmx->host_state.msr_host_bndcfgs)
+                wrmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
         /*
          * If the FPU is not active (through the host task or
          * the guest vcpu), then restore the cr0.TS bit.
@@ -2837,7 +2842,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
         min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
 #endif
         opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT |
-                VM_EXIT_ACK_INTR_ON_EXIT;
+                VM_EXIT_ACK_INTR_ON_EXIT | VM_EXIT_CLEAR_BNDCFGS;
         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
                                 &_vmexit_control) < 0)
                 return -EIO;
@@ -2854,7 +2859,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
                 _pin_based_exec_control &= ~PIN_BASED_POSTED_INTR;
 
         min = 0;
-        opt = VM_ENTRY_LOAD_IA32_PAT;
+        opt = VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS;
         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
                                 &_vmentry_control) < 0)
                 return -EIO;
@@ -7052,6 +7057,12 @@ static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
                 local_irq_enable();
 }
 
+static bool vmx_mpx_supported(void)
+{
+        return (vmcs_config.vmexit_ctrl & VM_EXIT_CLEAR_BNDCFGS) &&
+                (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_BNDCFGS);
+}
+
 static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
 {
         u32 exit_intr_info;
@@ -8634,6 +8645,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 
         .check_intercept = vmx_check_intercept,
         .handle_external_intr = vmx_handle_external_intr,
+        .mpx_supported = vmx_mpx_supported,
 };
 
 static int __init vmx_init(void)
@@ -8721,6 +8733,8 @@ static int __init vmx_init(void)
         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
+        vmx_disable_intercept_for_msr(MSR_IA32_BNDCFGS, true);
+
         memcpy(vmx_msr_bitmap_legacy_x2apic,
                         vmx_msr_bitmap_legacy, PAGE_SIZE);
         memcpy(vmx_msr_bitmap_longmode_x2apic,