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s390x/kvm: avoid syscalls by syncing registers with kvm_run

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We can avoid loads of syscalls when dropping to user space by storing the values
of more registers directly within kvm_run.

Support is added for:
- ARCH0: CPU timer, clock comparator, TOD programmable register,
         guest breaking-event register, program parameter
- PFAULT: pfault parameters (token, select, compare)

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
David Hildenbrand 2014-12-03 15:38:31 +01:00 committed by Cornelia Huck
parent fdb78ec006
commit 59ac15326e
1 changed files with 50 additions and 22 deletions
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72
target-s390x/kvm.c
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@ -252,18 +252,33 @@ int kvm_arch_put_registers(CPUState *cs, int level)
return 0;
}
/*
* These ONE_REGS are not protected by a capability. As they are only
* necessary for migration we just trace a possible error, but don't
* return with an error return code.
*/
kvm_set_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
kvm_set_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
kvm_set_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
kvm_set_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
kvm_set_one_reg(cs, KVM_REG_S390_PP, &env->pp);
if (can_sync_regs(cs, KVM_SYNC_ARCH0)) {
cs->kvm_run->s.regs.cputm = env->cputm;
cs->kvm_run->s.regs.ckc = env->ckc;
cs->kvm_run->s.regs.todpr = env->todpr;
cs->kvm_run->s.regs.gbea = env->gbea;
cs->kvm_run->s.regs.pp = env->pp;
cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ARCH0;
} else {
/*
* These ONE_REGS are not protected by a capability. As they are only
* necessary for migration we just trace a possible error, but don't
* return with an error return code.
*/
kvm_set_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
kvm_set_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
kvm_set_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
kvm_set_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
kvm_set_one_reg(cs, KVM_REG_S390_PP, &env->pp);
}
if (cap_async_pf) {
/* pfault parameters */
if (can_sync_regs(cs, KVM_SYNC_PFAULT)) {
cs->kvm_run->s.regs.pft = env->pfault_token;
cs->kvm_run->s.regs.pfs = env->pfault_select;
cs->kvm_run->s.regs.pfc = env->pfault_compare;
cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PFAULT;
} else if (cap_async_pf) {
r = kvm_set_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
if (r < 0) {
return r;
@ -367,18 +382,31 @@ int kvm_arch_get_registers(CPUState *cs)
env->psa = cs->kvm_run->s.regs.prefix;
}
/*
* These ONE_REGS are not protected by a capability. As they are only
* necessary for migration we just trace a possible error, but don't
* return with an error return code.
*/
kvm_get_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
kvm_get_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
kvm_get_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
kvm_get_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
kvm_get_one_reg(cs, KVM_REG_S390_PP, &env->pp);
if (can_sync_regs(cs, KVM_SYNC_ARCH0)) {
env->cputm = cs->kvm_run->s.regs.cputm;
env->ckc = cs->kvm_run->s.regs.ckc;
env->todpr = cs->kvm_run->s.regs.todpr;
env->gbea = cs->kvm_run->s.regs.gbea;
env->pp = cs->kvm_run->s.regs.pp;
} else {
/*
* These ONE_REGS are not protected by a capability. As they are only
* necessary for migration we just trace a possible error, but don't
* return with an error return code.
*/
kvm_get_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
kvm_get_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
kvm_get_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
kvm_get_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
kvm_get_one_reg(cs, KVM_REG_S390_PP, &env->pp);
}
if (cap_async_pf) {
/* pfault parameters */
if (can_sync_regs(cs, KVM_SYNC_PFAULT)) {
env->pfault_token = cs->kvm_run->s.regs.pft;
env->pfault_select = cs->kvm_run->s.regs.pfs;
env->pfault_compare = cs->kvm_run->s.regs.pfc;
} else if (cap_async_pf) {
r = kvm_get_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
if (r < 0) {
return r;