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| author | Paul Mackerras <paulus@ozlabs.org> | 2018-09-13 13:39:21 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-10-09 12:03:02 +1100 |
| commit | d6d0a4067d1fa179a531f1ed3fa138afb6b5db0b (patch) | |
| tree | f4c768e50106cef0b7eb5de1ea9fa4ed388b532a | |
| parent | 2351bc9a5e9ed804d248732327b4c6d1bb02d86f (diff) | |
| download | powerpc-d6d0a4067d1fa179a531f1ed3fa138afb6b5db0b.tar.gz | |
KVM: PPC: Book3S HV: Don't access HFSCR, LPIDR or LPCR when running nested
When running as a nested hypervisor, this avoids reading hypervisor
privileged registers (specifically HFSCR, LPIDR and LPCR) at startup;
instead reasonable default values are used. This also avoids writing
LPIDR in the single-vcpu entry/exit path.
Also, this removes the check for CPU_FTR_HVMODE in kvmppc_mmu_hv_init()
since its only caller already checks this.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_hv.c | 7 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 33 |
2 files changed, 24 insertions, 16 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 68e14afecac85b..c615617e78acc0 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -268,14 +268,13 @@ int kvmppc_mmu_hv_init(void) { unsigned long host_lpid, rsvd_lpid; - if (!cpu_has_feature(CPU_FTR_HVMODE)) - return -EINVAL; - if (!mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE)) return -EINVAL; /* POWER7 has 10-bit LPIDs (12-bit in POWER8) */ - host_lpid = mfspr(SPRN_LPID); + host_lpid = 0; + if (cpu_has_feature(CPU_FTR_HVMODE)) + host_lpid = mfspr(SPRN_LPID); rsvd_lpid = LPID_RSVD; kvmppc_init_lpid(rsvd_lpid + 1); diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 24a668388a6ee9..b8f14ea6e795e8 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -2174,15 +2174,18 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm, * Set the default HFSCR for the guest from the host value. * This value is only used on POWER9. * On POWER9, we want to virtualize the doorbell facility, so we - * turn off the HFSCR bit, which causes those instructions to trap. + * don't set the HFSCR_MSGP bit, and that causes those instructions + * to trap and then we emulate them. */ - vcpu->arch.hfscr = mfspr(SPRN_HFSCR); - if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) + vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | + HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP; + if (cpu_has_feature(CPU_FTR_HVMODE)) { + vcpu->arch.hfscr &= mfspr(SPRN_HFSCR); + if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) + vcpu->arch.hfscr |= HFSCR_TM; + } + if (cpu_has_feature(CPU_FTR_TM_COMP)) vcpu->arch.hfscr |= HFSCR_TM; - else if (!cpu_has_feature(CPU_FTR_TM_COMP)) - vcpu->arch.hfscr &= ~HFSCR_TM; - if (cpu_has_feature(CPU_FTR_ARCH_300)) - vcpu->arch.hfscr &= ~HFSCR_MSGP; kvmppc_mmu_book3s_hv_init(vcpu); @@ -4002,8 +4005,10 @@ int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, srcu_read_unlock(&kvm->srcu, srcu_idx); - mtspr(SPRN_LPID, kvm->arch.host_lpid); - isync(); + if (cpu_has_feature(CPU_FTR_HVMODE)) { + mtspr(SPRN_LPID, kvm->arch.host_lpid); + isync(); + } trace_hardirqs_off(); set_irq_happened(trap); @@ -4630,9 +4635,13 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm) kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); /* Init LPCR for virtual RMA mode */ - kvm->arch.host_lpid = mfspr(SPRN_LPID); - kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); - lpcr &= LPCR_PECE | LPCR_LPES; + if (cpu_has_feature(CPU_FTR_HVMODE)) { + kvm->arch.host_lpid = mfspr(SPRN_LPID); + kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); + lpcr &= LPCR_PECE | LPCR_LPES; + } else { + lpcr = 0; + } lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | LPCR_VPM0 | LPCR_VPM1; kvm->arch.vrma_slb_v = SLB_VSID_B_1T | |