[Qemu-devel] [PATCH 1/1] kvm: Fix eflags corruption in kvm mode

[Avi Kivity]

From: Jan Kiszka <address@hidden>

This should explain a lot of the weird breakages of upstream KVM we've
seen recently (actually we should have seen it much earlier):

Stop translating eflags into TCG format when in kvm mode as we never
translate it back and rather sync this broken state into the kernel.

Signed-off-by: Jan Kiszka <address@hidden>
Signed-off-by: Avi Kivity <address@hidden>
---
 cpu-exec.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index af4595b..3246c9e 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -232,11 +232,13 @@ int cpu_exec(CPUState *env1)
 
     env_to_regs();
 #if defined(TARGET_I386)
-    /* put eflags in CPU temporary format */
-    CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
-    DF = 1 - (2 * ((env->eflags >> 10) & 1));
-    CC_OP = CC_OP_EFLAGS;
-    env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
+    if (!kvm_enabled()) {
+        /* put eflags in CPU temporary format */
+        CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
+        DF = 1 - (2 * ((env->eflags >> 10) & 1));
+        CC_OP = CC_OP_EFLAGS;
+        env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
+    }
 #elif defined(TARGET_SPARC)
 #elif defined(TARGET_M68K)
     env->cc_op = CC_OP_FLAGS;
-- 
1.7.0