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KVM: PPC: elide struct thread_struct instances from stack

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Instead of instantiating a whole thread_struct on the stack use only the
required parts of it.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Tested-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Andreas Schwab
2010-05-31 21:59:13 +02:00
committed by Avi Kivity
parent 5120702e73
commit 49f6be8ea1
5 changed files with 97 additions and 95 deletions
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49
arch/powerpc/kvm/book3s.c
View File

@@ -1293,12 +1293,17 @@ extern int __kvmppc_vcpu_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int ret;
struct thread_struct ext_bkp;
double fpr[32][TS_FPRWIDTH];
unsigned int fpscr;
int fpexc_mode;
#ifdef CONFIG_ALTIVEC
bool save_vec = current->thread.used_vr;
vector128 vr[32];
vector128 vscr;
unsigned long uninitialized_var(vrsave);
int used_vr;
#endif
#ifdef CONFIG_VSX
bool save_vsx = current->thread.used_vsr;
int used_vsr;
#endif
ulong ext_msr;
@@ -1311,27 +1316,27 @@ int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
/* Save FPU state in stack */
if (current->thread.regs->msr & MSR_FP)
giveup_fpu(current);
memcpy(ext_bkp.fpr, current->thread.fpr, sizeof(current->thread.fpr));
ext_bkp.fpscr = current->thread.fpscr;
ext_bkp.fpexc_mode = current->thread.fpexc_mode;
memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
fpscr = current->thread.fpscr.val;
fpexc_mode = current->thread.fpexc_mode;
#ifdef CONFIG_ALTIVEC
/* Save Altivec state in stack */
if (save_vec) {
used_vr = current->thread.used_vr;
if (used_vr) {
if (current->thread.regs->msr & MSR_VEC)
giveup_altivec(current);
memcpy(ext_bkp.vr, current->thread.vr, sizeof(ext_bkp.vr));
ext_bkp.vscr = current->thread.vscr;
ext_bkp.vrsave = current->thread.vrsave;
memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
vscr = current->thread.vscr;
vrsave = current->thread.vrsave;
}
ext_bkp.used_vr = current->thread.used_vr;
#endif
#ifdef CONFIG_VSX
/* Save VSX state in stack */
if (save_vsx && (current->thread.regs->msr & MSR_VSX))
used_vsr = current->thread.used_vsr;
if (used_vsr && (current->thread.regs->msr & MSR_VSX))
__giveup_vsx(current);
ext_bkp.used_vsr = current->thread.used_vsr;
#endif
/* Remember the MSR with disabled extensions */
@@ -1356,22 +1361,22 @@ int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
kvmppc_giveup_ext(vcpu, MSR_VSX);
/* Restore FPU state from stack */
memcpy(current->thread.fpr, ext_bkp.fpr, sizeof(ext_bkp.fpr));
current->thread.fpscr = ext_bkp.fpscr;
current->thread.fpexc_mode = ext_bkp.fpexc_mode;
memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
current->thread.fpscr.val = fpscr;
current->thread.fpexc_mode = fpexc_mode;
#ifdef CONFIG_ALTIVEC
/* Restore Altivec state from stack */
if (save_vec && current->thread.used_vr) {
memcpy(current->thread.vr, ext_bkp.vr, sizeof(ext_bkp.vr));
current->thread.vscr = ext_bkp.vscr;
current->thread.vrsave= ext_bkp.vrsave;
if (used_vr && current->thread.used_vr) {
memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
current->thread.vscr = vscr;
current->thread.vrsave = vrsave;
}
current->thread.used_vr = ext_bkp.used_vr;
current->thread.used_vr = used_vr;
#endif
#ifdef CONFIG_VSX
current->thread.used_vsr = ext_bkp.used_vsr;
current->thread.used_vsr = used_vsr;
#endif
return ret;