From 1bc3fe818c9e823248f6ec299b1c518aa2df347c Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 22 May 2017 16:55:16 +1000 Subject: [PATCH] KVM: PPC: Book3S HV: Enable guests to use large decrementer mode on POWER9 This allows userspace (e.g. QEMU) to enable large decrementer mode for the guest when running on a POWER9 host, by setting the LPCR_LD bit in the guest LPCR value. With this, the guest exit code saves 64 bits of the guest DEC value on exit. Other places that use the guest DEC value check the LPCR_LD bit in the guest LPCR value, and if it is set, omit the 32-bit sign extension that would otherwise be done. This doesn't change the DEC emulation used by PR KVM because PR KVM is not supported on POWER9 yet. This is partly based on an earlier patch by Oliver O'Halloran. Signed-off-by: Paul Mackerras --- arch/powerpc/include/asm/kvm_host.h | 2 +- arch/powerpc/kvm/book3s_hv.c | 6 ++++++ arch/powerpc/kvm/book3s_hv_rmhandlers.S | 29 ++++++++++++++++++++++++----- arch/powerpc/kvm/emulate.c | 4 ++-- 4 files changed, 33 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 9c51ac4..3f879c8 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -579,7 +579,7 @@ struct kvm_vcpu_arch { ulong mcsrr0; ulong mcsrr1; ulong mcsr; - u32 dec; + ulong dec; #ifdef CONFIG_BOOKE u32 decar; #endif diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 8d1a365..ffbb1b3 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1143,6 +1143,12 @@ static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, mask = LPCR_DPFD | LPCR_ILE | LPCR_TC; if (cpu_has_feature(CPU_FTR_ARCH_207S)) mask |= LPCR_AIL; + /* + * On POWER9, allow userspace to enable large decrementer for the + * guest, whether or not the host has it enabled. + */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + mask |= LPCR_LD; /* Broken 32-bit version of LPCR must not clear top bits */ if (preserve_top32) diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 4888dd4..cc2a86b 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -936,7 +936,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300) mftb r7 subf r3,r7,r8 mtspr SPRN_DEC,r3 - stw r3,VCPU_DEC(r4) + std r3,VCPU_DEC(r4) ld r5, VCPU_SPRG0(r4) ld r6, VCPU_SPRG1(r4) @@ -1048,7 +1048,13 @@ kvmppc_cede_reentry: /* r4 = vcpu, r13 = paca */ li r0, BOOK3S_INTERRUPT_EXTERNAL bne cr1, 12f mfspr r0, SPRN_DEC - cmpwi r0, 0 +BEGIN_FTR_SECTION + /* On POWER9 check whether the guest has large decrementer enabled */ + andis. r8, r8, LPCR_LD@h + bne 15f +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) + extsw r0, r0 +15: cmpdi r0, 0 li r0, BOOK3S_INTERRUPT_DECREMENTER bge 5f @@ -1475,12 +1481,18 @@ mc_cont: mtspr SPRN_SPURR,r4 /* Save DEC */ + ld r3, HSTATE_KVM_VCORE(r13) mfspr r5,SPRN_DEC mftb r6 + /* On P9, if the guest has large decr enabled, don't sign extend */ +BEGIN_FTR_SECTION + ld r4, VCORE_LPCR(r3) + andis. r4, r4, LPCR_LD@h + bne 16f +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) extsw r5,r5 - add r5,r5,r6 +16: add r5,r5,r6 /* r5 is a guest timebase value here, convert to host TB */ - ld r3,HSTATE_KVM_VCORE(r13) ld r4,VCORE_TB_OFFSET(r3) subf r5,r4,r5 std r5,VCPU_DEC_EXPIRES(r9) @@ -2402,8 +2414,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM) mfspr r3, SPRN_DEC mfspr r4, SPRN_HDEC mftb r5 +BEGIN_FTR_SECTION + /* On P9 check whether the guest has large decrementer mode enabled */ + ld r6, HSTATE_KVM_VCORE(r13) + ld r6, VCORE_LPCR(r6) + andis. r6, r6, LPCR_LD@h + bne 68f +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) extsw r3, r3 - EXTEND_HDEC(r4) +68: EXTEND_HDEC(r4) cmpd r3, r4 ble 67f mtspr SPRN_DEC, r4 diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index c873ffe..4d8b4d6 100644 --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -39,7 +39,7 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) unsigned long dec_nsec; unsigned long long dec_time; - pr_debug("mtDEC: %x\n", vcpu->arch.dec); + pr_debug("mtDEC: %lx\n", vcpu->arch.dec); hrtimer_try_to_cancel(&vcpu->arch.dec_timer); #ifdef CONFIG_PPC_BOOK3S @@ -109,7 +109,7 @@ static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) case SPRN_TBWU: break; case SPRN_DEC: - vcpu->arch.dec = spr_val; + vcpu->arch.dec = (u32) spr_val; kvmppc_emulate_dec(vcpu); break; -- 2.7.4