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[Qemu-devel] [PATCH 2/2 v3] [S390-KVM] Regsync: Utilize selective runtim
From: |
Jason J. Herne |
Subject: |
[Qemu-devel] [PATCH 2/2 v3] [S390-KVM] Regsync: Utilize selective runtime reg sync for hot code paths |
Date: |
Mon, 11 Mar 2013 13:58:56 -0400 |
Make use of new kvm_s390_get_registers_partial() for kvm_handle_css_inst() and
handle_hypercall() since they only need registers from the partial set and they
are called quite frequently.
Signed-off-by: Jason J. Herne <address@hidden>
---
target-s390x/kvm.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 934757e..36861aa 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -468,12 +468,16 @@ static int kvm_handle_css_inst(S390CPU *cpu, struct
kvm_run *run,
int r = 0;
int no_cc = 0;
CPUS390XState *env = &cpu->env;
+ CPUState *cs = ENV_GET_CPU(env);
if (ipa0 != 0xb2) {
/* Not handled for now. */
return -1;
}
- cpu_synchronize_state(env);
+
+ kvm_s390_get_registers_partial(cs);
+ cs->kvm_vcpu_dirty = true;
+
switch (ipa1) {
case PRIV_XSCH:
r = ioinst_handle_xsch(env, env->regs[1]);
@@ -604,7 +608,10 @@ static int handle_priv(S390CPU *cpu, struct kvm_run *run,
static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
{
- cpu_synchronize_state(env);
+ CPUState *cs = ENV_GET_CPU(env);
+
+ kvm_s390_get_registers_partial(cs);
+ cs->kvm_vcpu_dirty = true;
env->regs[2] = s390_virtio_hypercall(env);
return 0;
--
1.7.10.4