diff options
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 19cbac6f9d03..983e5eda892f 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -468,7 +468,8 @@ void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr) * both the traditional FP registers and the added VSX * registers into thread.fpr[]. */ - giveup_fpu(current); + if (current->thread.regs->msr & MSR_FP) + giveup_fpu(current); for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) vcpu_fpr[i] = thread_fpr[get_fpr_index(i)]; @@ -483,7 +484,8 @@ void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr) #ifdef CONFIG_ALTIVEC if (msr & MSR_VEC) { - giveup_altivec(current); + if (current->thread.regs->msr & MSR_VEC) + giveup_altivec(current); memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr)); vcpu->arch.vscr = t->vscr; } @@ -575,8 +577,6 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, printk(KERN_INFO "Loading up ext 0x%lx\n", msr); #endif - current->thread.regs->msr |= msr; - if (msr & MSR_FP) { for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) thread_fpr[get_fpr_index(i)] = vcpu_fpr[i]; @@ -598,12 +598,32 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, #endif } + current->thread.regs->msr |= msr; vcpu->arch.guest_owned_ext |= msr; kvmppc_recalc_shadow_msr(vcpu); return RESUME_GUEST; } +/* + * Kernel code using FP or VMX could have flushed guest state to + * the thread_struct; if so, get it back now. + */ +static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu) +{ + unsigned long lost_ext; + + lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr; + if (!lost_ext) + return; + + if (lost_ext & MSR_FP) + kvmppc_load_up_fpu(); + if (lost_ext & MSR_VEC) + kvmppc_load_up_altivec(); + current->thread.regs->msr |= lost_ext; +} + int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned int exit_nr) { @@ -892,6 +912,7 @@ program_interrupt: } else { kvmppc_fix_ee_before_entry(); } + kvmppc_handle_lost_ext(vcpu); } trace_kvm_book3s_reenter(r, vcpu); |