target/i386: Added MSRPM and IOPM size check

The address of the last entry in the MSRPM and
in the IOPM must be smaller than the largest physical address.
(APM2 15.10-15.11)

Signed-off-by: Lara Lazier <laramglazier@gmail.com>
Message-Id: <20210705081802.18960-2-laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/svm.h b/target/i386/svm.h
index 5098733053abae6dd02eb1c0735cd1129feefcb5..adc058dc76dca39ef59ba9baf87a1b9eed2affb8 100644 (file)
--- a/target/i386/svm.h
+++ b/target/i386/svm.h
@@ -137,6 +137,9 @@
 
 #define SVM_CR0_RESERVED_MASK 0xffffffff00000000U
 
+#define SVM_MSRPM_SIZE         (1ULL << 13)
+#define SVM_IOPM_SIZE          ((1ULL << 13) + 1)
+
 struct QEMU_PACKED vmcb_control_area {
        uint16_t intercept_cr_read;
        uint16_t intercept_cr_write;

diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/svm_helper.c
index 1c2dbc18621a590933ec903e530488766dbc90fa..fa701829e5ffa9c5635cf0a8335f6727ab48bf8d 100644 (file)
--- a/target/i386/tcg/sysemu/svm_helper.c
+++ b/target/i386/tcg/sysemu/svm_helper.c
@@ -68,6 +68,7 @@ static inline void svm_load_seg_cache(CPUX86State *env, hwaddr addr,
 void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
 {
     CPUState *cs = env_cpu(env);
+    X86CPU *cpu = env_archcpu(env);
     target_ulong addr;
     uint64_t nested_ctl;
     uint32_t event_inj;
@@ -159,6 +160,20 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
     asid = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
                                                           control.asid));
 
+    uint64_t msrpm_base_pa = x86_ldq_phys(cs, env->vm_vmcb +
+                                    offsetof(struct vmcb,
+                                            control.msrpm_base_pa));
+    uint64_t iopm_base_pa = x86_ldq_phys(cs, env->vm_vmcb +
+                                 offsetof(struct vmcb, control.iopm_base_pa));
+
+    if ((msrpm_base_pa & ~0xfff) >= (1ull << cpu->phys_bits) - SVM_MSRPM_SIZE) {
+        cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
+    }
+
+    if ((iopm_base_pa & ~0xfff) >= (1ull << cpu->phys_bits) - SVM_IOPM_SIZE) {
+        cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
+    }
+
     env->nested_pg_mode = 0;
 
     if (!cpu_svm_has_intercept(env, SVM_EXIT_VMRUN)) {