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KVM: PPC: Load/save FP/VMX/VSX state directly to/from vcpu struct
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Now that we have the vcpu floating-point and vector state stored in
the same type of struct as the main kernel uses, we can load that
state directly from the vcpu struct instead of having extra copies
to/from the thread_struct.  Similarly, when the guest state needs to
be saved, we can have it saved it directly to the vcpu struct by
setting the current->thread.fp_save_area and current->thread.vr_save_area
pointers.  That also means that we don't need to back up and restore
userspace's FP/vector state.  This all makes the code simpler and
faster.

Note that it's not necessary to save or modify current->thread.fpexc_mode,
since nothing in KVM uses or is affected by its value.  Nor is it
necessary to touch used_vr or used_vsr.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
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Paul Mackerras authored and Alexander Graf committed Jan 9, 2014
1 parent efff191 commit 99dae3b
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Showing 3 changed files with 19 additions and 73 deletions.
72 changes: 16 additions & 56 deletions arch/powerpc/kvm/book3s_pr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -567,16 +567,16 @@ void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
* both the traditional FP registers and the added VSX
* registers into thread.fp_state.fpr[].
*/
if (current->thread.regs->msr & MSR_FP)
if (t->regs->msr & MSR_FP)
giveup_fpu(current);
vcpu->arch.fp = t->fp_state;
t->fp_save_area = NULL;
}

#ifdef CONFIG_ALTIVEC
if (msr & MSR_VEC) {
if (current->thread.regs->msr & MSR_VEC)
giveup_altivec(current);
vcpu->arch.vr = t->vr_state;
t->vr_save_area = NULL;
}
#endif

Expand Down Expand Up @@ -661,22 +661,20 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
#endif

if (msr & MSR_FP) {
t->fp_state = vcpu->arch.fp;
t->fpexc_mode = 0;
enable_kernel_fp();
load_fp_state(&t->fp_state);
load_fp_state(&vcpu->arch.fp);
t->fp_save_area = &vcpu->arch.fp;
}

if (msr & MSR_VEC) {
#ifdef CONFIG_ALTIVEC
t->vr_state = vcpu->arch.vr;
t->vrsave = -1;
enable_kernel_altivec();
load_vr_state(&t->vr_state);
load_vr_state(&vcpu->arch.vr);
t->vr_save_area = &vcpu->arch.vr;
#endif
}

current->thread.regs->msr |= msr;
t->regs->msr |= msr;
vcpu->arch.guest_owned_ext |= msr;
kvmppc_recalc_shadow_msr(vcpu);

Expand All @@ -697,12 +695,12 @@ static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)

if (lost_ext & MSR_FP) {
enable_kernel_fp();
load_fp_state(&current->thread.fp_state);
load_fp_state(&vcpu->arch.fp);
}
#ifdef CONFIG_ALTIVEC
if (lost_ext & MSR_VEC) {
enable_kernel_altivec();
load_vr_state(&current->thread.vr_state);
load_vr_state(&vcpu->arch.vr);
}
#endif
current->thread.regs->msr |= lost_ext;
Expand Down Expand Up @@ -1204,17 +1202,9 @@ static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int ret;
struct thread_fp_state fp;
int fpexc_mode;
#ifdef CONFIG_ALTIVEC
struct thread_vr_state vr;
unsigned long uninitialized_var(vrsave);
int used_vr;
#endif
#ifdef CONFIG_VSX
int used_vsr;
#endif
ulong ext_msr;

/* Check if we can run the vcpu at all */
if (!vcpu->arch.sane) {
Expand All @@ -1236,33 +1226,22 @@ static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
goto out;
}

/* Save FPU state in stack */
/* Save FPU state in thread_struct */
if (current->thread.regs->msr & MSR_FP)
giveup_fpu(current);
fp = current->thread.fp_state;
fpexc_mode = current->thread.fpexc_mode;

#ifdef CONFIG_ALTIVEC
/* Save Altivec state in stack */
used_vr = current->thread.used_vr;
if (used_vr) {
if (current->thread.regs->msr & MSR_VEC)
giveup_altivec(current);
vr = current->thread.vr_state;
vrsave = current->thread.vrsave;
}
/* Save Altivec state in thread_struct */
if (current->thread.regs->msr & MSR_VEC)
giveup_altivec(current);
#endif

#ifdef CONFIG_VSX
/* Save VSX state in stack */
used_vsr = current->thread.used_vsr;
if (used_vsr && (current->thread.regs->msr & MSR_VSX))
/* Save VSX state in thread_struct */
if (current->thread.regs->msr & MSR_VSX)
__giveup_vsx(current);
#endif

/* Remember the MSR with disabled extensions */
ext_msr = current->thread.regs->msr;

/* Preload FPU if it's enabled */
if (vcpu->arch.shared->msr & MSR_FP)
kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
Expand All @@ -1277,25 +1256,6 @@ static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
/* Make sure we save the guest FPU/Altivec/VSX state */
kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);

current->thread.regs->msr = ext_msr;

/* Restore FPU/VSX state from stack */
current->thread.fp_state = fp;
current->thread.fpexc_mode = fpexc_mode;

#ifdef CONFIG_ALTIVEC
/* Restore Altivec state from stack */
if (used_vr && current->thread.used_vr) {
current->thread.vr_state = vr;
current->thread.vrsave = vrsave;
}
current->thread.used_vr = used_vr;
#endif

#ifdef CONFIG_VSX
current->thread.used_vsr = used_vsr;
#endif

out:
vcpu->mode = OUTSIDE_GUEST_MODE;
return ret;
Expand Down
16 changes: 0 additions & 16 deletions arch/powerpc/kvm/booke.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -682,10 +682,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int ret, s;
struct thread_struct thread;
#ifdef CONFIG_PPC_FPU
struct thread_fp_state fp;
int fpexc_mode;
#endif

if (!vcpu->arch.sane) {
kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
Expand All @@ -703,11 +699,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
#ifdef CONFIG_PPC_FPU
/* Save userspace FPU state in stack */
enable_kernel_fp();
fp = current->thread.fp_state;
fpexc_mode = current->thread.fpexc_mode;

/* Restore guest FPU state to thread */
current->thread.fp_state = vcpu->arch.fp;

/*
* Since we can't trap on MSR_FP in GS-mode, we consider the guest
Expand Down Expand Up @@ -741,13 +732,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
kvmppc_save_guest_fp(vcpu);

vcpu->fpu_active = 0;

/* Save guest FPU state from thread */
vcpu->arch.fp = current->thread.fp_state;

/* Restore userspace FPU state from stack */
current->thread.fp_state = fp;
current->thread.fpexc_mode = fpexc_mode;
#endif

out:
Expand Down
4 changes: 3 additions & 1 deletion arch/powerpc/kvm/booke.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,8 @@ static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu)
#ifdef CONFIG_PPC_FPU
if (vcpu->fpu_active && !(current->thread.regs->msr & MSR_FP)) {
enable_kernel_fp();
load_fp_state(&current->thread.fp_state);
load_fp_state(&vcpu->arch.fp);
current->thread.fp_save_area = &vcpu->arch.fp;
current->thread.regs->msr |= MSR_FP;
}
#endif
Expand All @@ -152,6 +153,7 @@ static inline void kvmppc_save_guest_fp(struct kvm_vcpu *vcpu)
#ifdef CONFIG_PPC_FPU
if (vcpu->fpu_active && (current->thread.regs->msr & MSR_FP))
giveup_fpu(current);
current->thread.fp_save_area = NULL;
#endif
}

Expand Down

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