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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 12:52:19 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 13:09:01 +0300 |
| commit | a089a6869e7f613a8d961ac65bafd127317e4c5c (patch) | |
| tree | 4e1e8b30695f1eb621699f150f6516a3cd57f4bc /arch/powerpc/kvm/book3s_hv_p9_entry.c | |
| parent | 9c75f65f3583b0cf467c378a1076f0b50bbc2fb1 (diff) | |
| download | linux-a089a6869e7f613a8d961ac65bafd127317e4c5c.tar.xz | |
KVM: PPC: Book3S HV P9: Don't restore PSSCR if not needed
This also moves the PSSCR update in nested entry to avoid a SPR
scoreboard stall.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-42-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_p9_entry.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_p9_entry.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index 0f341011816c..eae9d806d704 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -649,6 +649,7 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc unsigned long host_dawr0; unsigned long host_dawrx0; unsigned long host_psscr; + unsigned long host_hpsscr; unsigned long host_pidr; unsigned long host_dawr1; unsigned long host_dawrx1; @@ -666,7 +667,9 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc host_hfscr = mfspr(SPRN_HFSCR); host_ciabr = mfspr(SPRN_CIABR); - host_psscr = mfspr(SPRN_PSSCR); + host_psscr = mfspr(SPRN_PSSCR_PR); + if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) + host_hpsscr = mfspr(SPRN_PSSCR); host_pidr = mfspr(SPRN_PID); if (dawr_enabled()) { @@ -750,8 +753,14 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc if (vcpu->arch.ciabr != host_ciabr) mtspr(SPRN_CIABR, vcpu->arch.ciabr); - mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC | - (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); + + if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { + mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC | + (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); + } else { + if (vcpu->arch.psscr != host_psscr) + mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); + } mtspr(SPRN_HFSCR, vcpu->arch.hfscr); @@ -957,7 +966,7 @@ tm_return_to_guest: vcpu->arch.ic = mfspr(SPRN_IC); vcpu->arch.pid = mfspr(SPRN_PID); - vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS; + vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0); vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1); @@ -1003,9 +1012,12 @@ tm_return_to_guest: mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr); mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr); - /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */ - mtspr(SPRN_PSSCR, host_psscr | - (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); + if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { + /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */ + mtspr(SPRN_PSSCR, host_hpsscr | + (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); + } + mtspr(SPRN_HFSCR, host_hfscr); if (vcpu->arch.ciabr != host_ciabr) mtspr(SPRN_CIABR, host_ciabr); |