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[PULL,19/35] kvmvapic: patch_instruction fix

Message ID 1414776373-9704-20-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini Oct. 31, 2014, 5:25 p.m. UTC 
From: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

When QEMU works in icount mode cpu_restore_state function performs two actions:
restoring the program counter and updating icount to the correct value.
kvmvapic's patch_instruction function is called by cpu_report_tpr_access
function which also invokes cpu_restore_state. It results to calling
cpu_restore_state twice - in cpu_report_tpr_access and in patch_instruction.
When icount is disabled second call is safe. But when icount is enabled,
cpu_restore_state modifies instructions counter twice, which leads to incorrect
behavior. This patch removes useless cpu_restore_state call from kvmvapic.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
---
 hw/i386/kvmvapic.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c
index 2dc362b..c6d34b2 100644
--- a/hw/i386/kvmvapic.c
+++ b/hw/i386/kvmvapic.c
@@ -405,7 +405,6 @@  static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip)
     }
 
     if (!kvm_enabled()) {
-        cpu_restore_state(cs, cs->mem_io_pc);
         cpu_get_tb_cpu_state(env, &current_pc, &current_cs_base,
                              &current_flags);
     }