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KVM: PPC: Book3S PR: Expose TAR facility to guest

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POWER8 implements a new register called TAR. This register has to be
enabled in FSCR and then from KVM's point of view is mere storage.

This patch enables the guest to use TAR.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf
2014-04-22 12:26:58 +02:00
parent 616dff8602
commit e14e7a1e53
5 changed files with 28 additions and 6 deletions
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18
arch/powerpc/kvm/book3s_pr.c
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@@ -90,6 +90,7 @@ static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
#endif
kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
vcpu->cpu = -1;
}
@@ -625,6 +626,14 @@ static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
/* Facility not available to the guest, ignore giveup request*/
return;
}
switch (fac) {
case FSCR_TAR_LG:
vcpu->arch.tar = mfspr(SPRN_TAR);
mtspr(SPRN_TAR, current->thread.tar);
vcpu->arch.shadow_fscr &= ~FSCR_TAR;
break;
}
#endif
}
@@ -794,6 +803,12 @@ static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
}
switch (fac) {
case FSCR_TAR_LG:
/* TAR switching isn't lazy in Linux yet */
current->thread.tar = mfspr(SPRN_TAR);
mtspr(SPRN_TAR, vcpu->arch.tar);
vcpu->arch.shadow_fscr |= FSCR_TAR;
break;
default:
kvmppc_emulate_fac(vcpu, fac);
break;
@@ -1393,6 +1408,9 @@ 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);
/* Make sure we save the guest TAR/EBB/DSCR state */
kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
out:
vcpu->mode = OUTSIDE_GUEST_MODE;
return ret;