[PULL 05/10] target/i386: svm: fix sign extension of exit code

[Paolo Bonzini <pbonzini@redhat.com>]

The exit_code parameter of cpu_vmexit is declared as uint32_t, but exit
codes are 64 bits wide according to the AMD SVM specification.  And because
uint32_t is unsigned, this causes exit codes to be zero-extended, for example
writing SVM_EXIT_ERR as 0xffff_ffff instead of the expected 0xffff_ffff_ffff_ffff.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2977
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/helper-tcg.h        | 2 +-
 target/i386/tcg/system/svm_helper.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/target/i386/tcg/helper-tcg.h b/target/i386/tcg/helper-tcg.h
index be011b06b7c..e41cbda407a 100644
--- a/target/i386/tcg/helper-tcg.h
+++ b/target/i386/tcg/helper-tcg.h
@@ -99,7 +99,7 @@ void cpu_load_eflags(CPUX86State *env, int eflags, int update_mask);
 
 /* system/svm_helper.c */
 #ifndef CONFIG_USER_ONLY
-G_NORETURN void cpu_vmexit(CPUX86State *nenv, uint32_t exit_code,
+G_NORETURN void cpu_vmexit(CPUX86State *nenv, uint64_t exit_code,
                            uint64_t exit_info_1, uintptr_t retaddr);
 void do_vmexit(CPUX86State *env);
 #endif
diff --git a/target/i386/tcg/system/svm_helper.c b/target/i386/tcg/system/svm_helper.c
index 505788b0e26..4b86796518f 100644
--- a/target/i386/tcg/system/svm_helper.c
+++ b/target/i386/tcg/system/svm_helper.c
@@ -128,7 +128,7 @@ static inline bool virtual_gif_enabled(CPUX86State *env)
     return false;
 }
 
-static inline bool virtual_vm_load_save_enabled(CPUX86State *env, uint32_t exit_code, uintptr_t retaddr)
+static inline bool virtual_vm_load_save_enabled(CPUX86State *env, uint64_t exit_code, uintptr_t retaddr)
 {
     uint64_t lbr_ctl;
 
@@ -723,7 +723,7 @@ void helper_svm_check_io(CPUX86State *env, uint32_t port, uint32_t param,
     }
 }
 
-void cpu_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1,
+void cpu_vmexit(CPUX86State *env, uint64_t exit_code, uint64_t exit_info_1,
                 uintptr_t retaddr)
 {
     CPUState *cs = env_cpu(env);
@@ -732,7 +732,7 @@ void cpu_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1,
 
     qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmexit(%08x, %016" PRIx64 ", %016"
                   PRIx64 ", " TARGET_FMT_lx ")!\n",
-                  exit_code, exit_info_1,
+                  (uint32_t)exit_code, exit_info_1,
                   x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
                                                    control.exit_info_2)),
                   env->eip);
-- 
2.51.1