diff options
| author | Alexander Graf <agraf@suse.de> | 2014-04-22 12:26:58 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-05-30 14:26:23 +0200 |
| commit | e14e7a1e537d6e18f9c511f25c25c5efb7799fb5 (patch) | |
| tree | f0e8f7c0450dcbb83ea1f6e527b99e69e23f8e9a /arch/powerpc/kvm/book3s_pr.c | |
| parent | 616dff86028298dbc91174fb3d12b8ed8cd74955 (diff) | |
KVM: PPC: Book3S PR: Expose TAR facility to guest
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>
Diffstat (limited to 'arch/powerpc/kvm/book3s_pr.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index ddc626eea2da..7d27a9518f07 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -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; |