target/i386: Added consistency checks for CR0

The combination of unset CD and set NW bit in CR0 is illegal.
CR0[63:32] are also reserved and need to be zero.
(AMD64 Architecture Programmer's Manual, V2, 15.5)

Signed-off-by: Lara Lazier <laramglazier@gmail.com>
Message-Id: <20210616123907.17765-4-laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.h

@@ -224,6 +224,8 @@ typedef enum X86Seg {
 #define CR0_NE_MASK  (1U << 5)
 #define CR0_WP_MASK  (1U << 16)
 #define CR0_AM_MASK  (1U << 18)
+#define CR0_NW_MASK  (1U << 29)
+#define CR0_CD_MASK  (1U << 30)
 #define CR0_PG_MASK  (1U << 31)
 
 #define CR4_VME_MASK  (1U << 0)

target/i386/svm.h

@@ -135,6 +135,8 @@
 #define SVM_NPTEXIT_GPA     (1ULL << 32)
 #define SVM_NPTEXIT_GPT     (1ULL << 33)
 
+#define SVM_CR0_RESERVED_MASK 0xffffffff00000000U
+
 struct QEMU_PACKED vmcb_control_area {
 	uint16_t intercept_cr_read;
 	uint16_t intercept_cr_write;

target/i386/tcg/sysemu/svm_helper.c

@@ -73,6 +73,7 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
     uint32_t event_inj;
     uint32_t int_ctl;
     uint32_t asid;
+    uint64_t new_cr0;
 
     cpu_svm_check_intercept_param(env, SVM_EXIT_VMRUN, 0, GETPC());
 
@@ -192,13 +193,18 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
     env->idt.limit = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
                                                       save.idtr.limit));
 
+    new_cr0 = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.cr0));
+    if (new_cr0 & SVM_CR0_RESERVED_MASK) {
+        cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
+    }
+    if ((new_cr0 & CR0_NW_MASK) && !(new_cr0 & CR0_CD_MASK)) {
+        cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
+    }
     /* clear exit_info_2 so we behave like the real hardware */
     x86_stq_phys(cs,
              env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2), 0);
 
-    cpu_x86_update_cr0(env, x86_ldq_phys(cs,
-                                     env->vm_vmcb + offsetof(struct vmcb,
-                                                             save.cr0)));
+    cpu_x86_update_cr0(env, new_cr0);
     cpu_x86_update_cr4(env, x86_ldq_phys(cs,
                                      env->vm_vmcb + offsetof(struct vmcb,
                                                              save.cr4)));