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Utilize selective runtime reg sync for hot code paths 

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 <jjherne@us.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Jason J. Herne 2013-04-25 04:25:51 +00:00 committed by Alexander Graf
parent 420840e58b
commit 3474b67948
1 changed files with 12 additions and 3 deletions
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15
target-s390x/kvm.c
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@ -467,12 +467,16 @@ 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]);
@ -603,7 +607,10 @@ 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;
@ -808,7 +815,9 @@ static int handle_tsch(S390CPU *cpu)
struct kvm_run *run = cs->kvm_run;
int ret;
cpu_synchronize_state(env);
kvm_s390_get_registers_partial(cs);
cs->kvm_vcpu_dirty = true;
ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
if (ret >= 0) {
/* Success; set condition code. */