[v3,1/2] target-i386: Intel MPX

Commit Message

Liu, Jinsong Dec. 6, 2013, 2:16 p.m. UTC

From ee8b72df3b5503514b748035e6b1cb4d61f8e701 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <[e-mail]>
Date: Thu, 5 Dec 2013 08:32:12 +0800
Subject: [PATCH v3 1/2] target-i386: Intel MPX

Add some MPX related definiation, and hardcode sizes and offsets
of xsave features 3 and 4. It also add corresponding part to
kvm_get/put_xsave, and vmstate.

Signed-off-by: Liu Jinsong <[e-mail]>
---
 target-i386/cpu.c     |    4 ++++
 target-i386/cpu.h     |   22 +++++++++++++++++++---
 target-i386/kvm.c     |   10 ++++++++++
 target-i386/machine.c |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 79 insertions(+), 3 deletions(-)

Patch

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index bb98f6d..5076a94 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -336,6 +336,10 @@  typedef struct ExtSaveArea {
 static const ExtSaveArea ext_save_areas[] = {
     [2] = { .feature = FEAT_1_ECX, .bits = CPUID_EXT_AVX,
             .offset = 0x240, .size = 0x100 },
+    [3] = { .feature = FEAT_7_0_EBX, .bits = CPUID_7_0_EBX_MPX,
+            .offset = 0x3c0, .size = 0x40  },
+    [4] = { .feature = FEAT_7_0_EBX, .bits = CPUID_7_0_EBX_MPX,
+            .offset = 0x400, .size = 0x10  },
 };
 
 const char *get_register_name_32(unsigned int reg)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index ea373e8..c28b901 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -380,9 +380,12 @@ 
 
 #define MSR_VM_HSAVE_PA                 0xc0010117
 
-#define XSTATE_FP                       1
-#define XSTATE_SSE                      2
-#define XSTATE_YMM                      4
+#define XSTATE_FP                       (1ULL << 0)
+#define XSTATE_SSE                      (1ULL << 1)
+#define XSTATE_YMM                      (1ULL << 2)
+#define XSTATE_BNDREGS                  (1ULL << 3)
+#define XSTATE_BNDCSR                   (1ULL << 4)
+
 
 /* CPUID feature words */
 typedef enum FeatureWord {
@@ -545,6 +548,7 @@  typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EBX_ERMS     (1 << 9)
 #define CPUID_7_0_EBX_INVPCID  (1 << 10)
 #define CPUID_7_0_EBX_RTM      (1 << 11)
+#define CPUID_7_0_EBX_MPX      (1 << 14)
 #define CPUID_7_0_EBX_RDSEED   (1 << 18)
 #define CPUID_7_0_EBX_ADX      (1 << 19)
 #define CPUID_7_0_EBX_SMAP     (1 << 20)
@@ -695,6 +699,16 @@  typedef union {
     uint64_t q;
 } MMXReg;
 
+typedef struct BNDReg {
+    uint64_t lb;
+    uint64_t ub;
+} BNDReg;
+
+typedef struct BNDCSReg {
+    uint64_t cfgu;
+    uint64_t sts;
+} BNDCSReg;
+
 #ifdef HOST_WORDS_BIGENDIAN
 #define XMM_B(n) _b[15 - (n)]
 #define XMM_W(n) _w[7 - (n)]
@@ -912,6 +926,8 @@  typedef struct CPUX86State {
 
     uint64_t xstate_bv;
     XMMReg ymmh_regs[CPU_NB_REGS];
+    BNDReg bnd_regs[4];
+    BNDCSReg bndcs_regs;
 
     uint64_t xcr0;
 
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 1188482..ff913ff 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -975,6 +975,8 @@  static int kvm_put_fpu(X86CPU *cpu)
 #define XSAVE_XMM_SPACE   40
 #define XSAVE_XSTATE_BV   128
 #define XSAVE_YMMH_SPACE  144
+#define XSAVE_BNDREGS     240
+#define XSAVE_BNDCSR      256
 
 static int kvm_put_xsave(X86CPU *cpu)
 {
@@ -1007,6 +1009,10 @@  static int kvm_put_xsave(X86CPU *cpu)
     *(uint64_t *)&xsave->region[XSAVE_XSTATE_BV] = env->xstate_bv;
     memcpy(&xsave->region[XSAVE_YMMH_SPACE], env->ymmh_regs,
             sizeof env->ymmh_regs);
+    memcpy(&xsave->region[XSAVE_BNDREGS], env->bnd_regs,
+            sizeof env->bnd_regs);
+    memcpy(&xsave->region[XSAVE_BNDCSR], &env->bndcs_regs,
+            sizeof(env->bndcs_regs));
     r = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
     return r;
 }
@@ -1289,6 +1295,10 @@  static int kvm_get_xsave(X86CPU *cpu)
     env->xstate_bv = *(uint64_t *)&xsave->region[XSAVE_XSTATE_BV];
     memcpy(env->ymmh_regs, &xsave->region[XSAVE_YMMH_SPACE],
             sizeof env->ymmh_regs);
+    memcpy(env->bnd_regs, &xsave->region[XSAVE_BNDREGS],
+            sizeof env->bnd_regs);
+    memcpy(&env->bndcs_regs, &xsave->region[XSAVE_BNDCSR],
+            sizeof(env->bndcs_regs));
     return 0;
 }
 
diff --git a/target-i386/machine.c b/target-i386/machine.c
index e568da2..ceab51b 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -63,6 +63,21 @@  static const VMStateDescription vmstate_ymmh_reg = {
 #define VMSTATE_YMMH_REGS_VARS(_field, _state, _n, _v)                         \
     VMSTATE_STRUCT_ARRAY(_field, _state, _n, _v, vmstate_ymmh_reg, XMMReg)
 
+static const VMStateDescription vmstate_bnd_regs = {
+    .name = "bnd_regs",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        VMSTATE_UINT64(lb, BNDReg),
+        VMSTATE_UINT64(ub, BNDReg),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+#define VMSTATE_BND_REGS(_field, _state, _n)          \
+    VMSTATE_STRUCT_ARRAY(_field, _state, _n, 0, vmstate_bnd_regs, BNDReg)
+
 static const VMStateDescription vmstate_mtrr_var = {
     .name = "mtrr_var",
     .version_id = 1,
@@ -506,6 +521,34 @@  static const VMStateDescription vmstate_msr_architectural_pmu = {
     }
 };
 
+static bool mpx_needed(void *opaque)
+{
+    X86CPU *cpu = opaque;
+    CPUX86State *env = &cpu->env;
+    unsigned int i;
+
+    for (i = 0; i < 4; i++) {
+        if (env->bnd_regs[i].lb || env->bnd_regs[i].ub) {
+            return true;
+        }
+    }
+
+    return env->bndcs_regs.cfgu || env->bndcs_regs.sts;
+}
+
+static const VMStateDescription vmstate_mpx = {
+    .name = "cpu/mpx",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        VMSTATE_BND_REGS(env.bnd_regs, X86CPU, 4),
+        VMSTATE_UINT64(env.bndcs_regs.cfgu, X86CPU),
+        VMSTATE_UINT64(env.bndcs_regs.sts, X86CPU),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 const VMStateDescription vmstate_x86_cpu = {
     .name = "cpu",
     .version_id = 12,
@@ -638,6 +681,9 @@  const VMStateDescription vmstate_x86_cpu = {
             .vmsd = &vmstate_msr_architectural_pmu,
             .needed = pmu_enable_needed,
         } , {
+            .vmsd = &vmstate_mpx,
+            .needed = mpx_needed,
+        } , {
             /* empty */
         }
     }