[PATCH 3/3] target/i386: svm: do not discard high 32 bits of EXITINFO1

[Paolo Bonzini <pbonzini@redhat.com>]

env->error_code is only 32-bits wide, so the high 32 bits of EXITINFO1
are being lost.  However, even though saving guest state and restoring
host state must be delayed to do_vmexit, because they might take tb_lock,
it is always possible to write to the VMCB.  So do this for the exit
code and EXITINFO1, just like it is already being done for EXITINFO2.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/helper-tcg.h |  2 +-
 target/i386/tcg/seg_helper.c |  4 ++--
 target/i386/tcg/svm_helper.c | 15 +++++++--------
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/target/i386/tcg/helper-tcg.h b/target/i386/tcg/helper-tcg.h
index ef60e2e04b..bcdfca06f6 100644
--- a/target/i386/tcg/helper-tcg.h
+++ b/target/i386/tcg/helper-tcg.h
@@ -80,7 +80,7 @@ void cpu_load_eflags(CPUX86State *env, int eflags, int update_mask);
 /* svm_helper.c */
 void QEMU_NORETURN cpu_vmexit(CPUX86State *nenv, uint32_t exit_code,
                               uint64_t exit_info_1, uintptr_t retaddr);
-void do_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1);
+void do_vmexit(CPUX86State *env);
 
 /* seg_helper.c */
 void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw);
diff --git a/target/i386/tcg/seg_helper.c b/target/i386/tcg/seg_helper.c
index 180d47f0e9..d180a381d1 100644
--- a/target/i386/tcg/seg_helper.c
+++ b/target/i386/tcg/seg_helper.c
@@ -1305,9 +1305,9 @@ void x86_cpu_do_interrupt(CPUState *cs)
     /* successfully delivered */
     env->old_exception = -1;
 #else
-    if (cs->exception_index >= EXCP_VMEXIT) {
+    if (cs->exception_index == EXCP_VMEXIT) {
         assert(env->old_exception == -1);
-        do_vmexit(env, cs->exception_index - EXCP_VMEXIT, env->error_code);
+        do_vmexit(env);
     } else {
         do_interrupt_all(cpu, cs->exception_index,
                          env->exception_is_int,
diff --git a/target/i386/tcg/svm_helper.c b/target/i386/tcg/svm_helper.c
index 097bb9b83d..0145afceae 100644
--- a/target/i386/tcg/svm_helper.c
+++ b/target/i386/tcg/svm_helper.c
@@ -621,15 +621,19 @@ void cpu_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1,
                                                    control.exit_info_2)),
                   env->eip);
 
-    cs->exception_index = EXCP_VMEXIT + exit_code;
-    env->error_code = exit_info_1;
+    cs->exception_index = EXCP_VMEXIT;
+    x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_code),
+             exit_code);
+
+    x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
+                                             control.exit_info_1), exit_info_1),
 
     /* remove any pending exception */
     env->old_exception = -1;
     cpu_loop_exit(cs);
 }
 
-void do_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1)
+void do_vmexit(CPUX86State *env)
 {
     CPUState *cs = env_cpu(env);
     uint32_t int_ctl;
@@ -762,11 +766,6 @@ void do_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1)
                           env->vm_hsave + offsetof(struct vmcb, save.dr7));
 
     /* other setups */
-    x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_code),
-             exit_code);
-    x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_info_1),
-             exit_info_1);
-
     x86_stl_phys(cs,
              env->vm_vmcb + offsetof(struct vmcb, control.exit_int_info),
              x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
-- 
2.26.2