target/i386: Refactored intercept checks into cpu_svm_has_intercept

Added cpu_svm_has_intercept to reduce duplication when checking the
corresponding intercept bit outside of cpu_svm_check_intercept_param

Signed-off-by: Lara Lazier <laramglazier@gmail.com>
Message-Id: <20210616123907.17765-2-laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 62 insertions, 47 deletions

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index ac3abea..64b4e46 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -2149,9 +2149,13 @@ static inline void
 cpu_svm_check_intercept_param(CPUX86State *env1, uint32_t type,
                               uint64_t param, uintptr_t retaddr)
 { /* no-op */ }
+static inline bool
+cpu_svm_has_intercept(CPUX86State *env, uint32_t type)
+{ return false; }
 #else
 void cpu_svm_check_intercept_param(CPUX86State *env1, uint32_t type,
                                    uint64_t param, uintptr_t retaddr);
+bool cpu_svm_has_intercept(CPUX86State *env, uint32_t type);
 #endif
 
 /* apic.c */
diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/svm_helper.c
index 9d67129..2f7606b 100644
--- a/target/i386/tcg/sysemu/svm_helper.c
+++ b/target/i386/tcg/sysemu/svm_helper.c
@@ -412,80 +412,91 @@ void helper_clgi(CPUX86State *env)
     env->hflags2 &= ~HF2_GIF_MASK;
 }
 
-void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type,
-                                   uint64_t param, uintptr_t retaddr)
+bool cpu_svm_has_intercept(CPUX86State *env, uint32_t type)
 {
-    CPUState *cs = env_cpu(env);
-
-    if (likely(!(env->hflags & HF_GUEST_MASK))) {
-        return;
-    }
     switch (type) {
     case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR0 + 8:
         if (env->intercept_cr_read & (1 << (type - SVM_EXIT_READ_CR0))) {
-            cpu_vmexit(env, type, param, retaddr);
+            return true;
         }
         break;
     case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR0 + 8:
         if (env->intercept_cr_write & (1 << (type - SVM_EXIT_WRITE_CR0))) {
-            cpu_vmexit(env, type, param, retaddr);
+            return true;
         }
         break;
     case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR0 + 7:
         if (env->intercept_dr_read & (1 << (type - SVM_EXIT_READ_DR0))) {
-            cpu_vmexit(env, type, param, retaddr);
+            return true;
         }
         break;
     case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR0 + 7:
         if (env->intercept_dr_write & (1 << (type - SVM_EXIT_WRITE_DR0))) {
-            cpu_vmexit(env, type, param, retaddr);
+            return true;
         }
         break;
     case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 31:
         if (env->intercept_exceptions & (1 << (type - SVM_EXIT_EXCP_BASE))) {
-            cpu_vmexit(env, type, param, retaddr);
-        }
-        break;
-    case SVM_EXIT_MSR:
-        if (env->intercept & (1ULL << (SVM_EXIT_MSR - SVM_EXIT_INTR))) {
-            /* FIXME: this should be read in at vmrun (faster this way?) */
-            uint64_t addr = x86_ldq_phys(cs, env->vm_vmcb +
-                                     offsetof(struct vmcb,
-                                              control.msrpm_base_pa));
-            uint32_t t0, t1;
-
-            switch ((uint32_t)env->regs[R_ECX]) {
-            case 0 ... 0x1fff:
-                t0 = (env->regs[R_ECX] * 2) % 8;
-                t1 = (env->regs[R_ECX] * 2) / 8;
-                break;
-            case 0xc0000000 ... 0xc0001fff:
-                t0 = (8192 + env->regs[R_ECX] - 0xc0000000) * 2;
-                t1 = (t0 / 8);
-                t0 %= 8;
-                break;
-            case 0xc0010000 ... 0xc0011fff:
-                t0 = (16384 + env->regs[R_ECX] - 0xc0010000) * 2;
-                t1 = (t0 / 8);
-                t0 %= 8;
-                break;
-            default:
-                cpu_vmexit(env, type, param, retaddr);
-                t0 = 0;
-                t1 = 0;
-                break;
-            }
-            if (x86_ldub_phys(cs, addr + t1) & ((1 << param) << t0)) {
-                cpu_vmexit(env, type, param, retaddr);
-            }
+            return true;
         }
         break;
     default:
         if (env->intercept & (1ULL << (type - SVM_EXIT_INTR))) {
-            cpu_vmexit(env, type, param, retaddr);
+            return true;
         }
         break;
     }
+    return false;
+}
+
+void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type,
+                                   uint64_t param, uintptr_t retaddr)
+{
+    CPUState *cs = env_cpu(env);
+
+    if (likely(!(env->hflags & HF_GUEST_MASK))) {
+        return;
+    }
+
+    if (!cpu_svm_has_intercept(env, type)) {
+        return;
+    }
+
+    if (type == SVM_EXIT_MSR) {
+        /* FIXME: this should be read in at vmrun (faster this way?) */
+        uint64_t addr = x86_ldq_phys(cs, env->vm_vmcb +
+                                    offsetof(struct vmcb,
+                                            control.msrpm_base_pa));
+        uint32_t t0, t1;
+
+        switch ((uint32_t)env->regs[R_ECX]) {
+        case 0 ... 0x1fff:
+            t0 = (env->regs[R_ECX] * 2) % 8;
+            t1 = (env->regs[R_ECX] * 2) / 8;
+            break;
+        case 0xc0000000 ... 0xc0001fff:
+            t0 = (8192 + env->regs[R_ECX] - 0xc0000000) * 2;
+            t1 = (t0 / 8);
+            t0 %= 8;
+            break;
+        case 0xc0010000 ... 0xc0011fff:
+            t0 = (16384 + env->regs[R_ECX] - 0xc0010000) * 2;
+            t1 = (t0 / 8);
+            t0 %= 8;
+            break;
+        default:
+            cpu_vmexit(env, type, param, retaddr);
+            t0 = 0;
+            t1 = 0;
+            break;
+        }
+        if (x86_ldub_phys(cs, addr + t1) & ((1 << param) << t0)) {
+            cpu_vmexit(env, type, param, retaddr);
+        }
+        return;
+    }
+
+    cpu_vmexit(env, type, param, retaddr);
 }
 
 void helper_svm_check_intercept(CPUX86State *env, uint32_t type)