From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mihai Caraman Subject: [PATCH v6 3/5] KVM: PPC: Book3s: Remove kvmppc_read_inst() function Date: Wed, 23 Jul 2014 19:06:20 +0300 Message-ID: <1406131582-6052-4-git-send-email-mihai.caraman@freescale.com> References: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , Mihai Caraman To: Return-path: In-Reply-To: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> Sender: kvm-ppc-owner@vger.kernel.org List-Id: kvm.vger.kernel.org In the context of replacing kvmppc_ld() function calls with a version of kvmppc_get_last_inst() which allow to fail, Alex Graf suggested this: "If we get EMULATE_AGAIN, we just have to make sure we go back into the guest. No need to inject an ISI into the guest - it'll do that all by itself. With an error returning kvmppc_get_last_inst we can just use completely get rid of kvmppc_read_inst() and only use kvmppc_get_last_inst() instead." As a intermediate step get rid of kvmppc_read_inst() and only use kvmppc_ld() instead. Signed-off-by: Mihai Caraman --- v6: - add proper comments for VSX interrupt handling v5: - make paired single emulation the unusual v4: - new patch arch/powerpc/kvm/book3s_pr.c | 85 ++++++++++++++++++-------------------------- 1 file changed, 34 insertions(+), 51 deletions(-) diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index e40765f..e76aec3 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -710,42 +710,6 @@ static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac) #endif } -static int kvmppc_read_inst(struct kvm_vcpu *vcpu) -{ - ulong srr0 = kvmppc_get_pc(vcpu); - u32 last_inst = kvmppc_get_last_inst(vcpu); - int ret; - - ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); - if (ret == -ENOENT) { - ulong msr = kvmppc_get_msr(vcpu); - - msr = kvmppc_set_field(msr, 33, 33, 1); - msr = kvmppc_set_field(msr, 34, 36, 0); - msr = kvmppc_set_field(msr, 42, 47, 0); - kvmppc_set_msr_fast(vcpu, msr); - kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE); - return EMULATE_AGAIN; - } - - return EMULATE_DONE; -} - -static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr) -{ - - /* Need to do paired single emulation? */ - if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)) - return EMULATE_DONE; - - /* Read out the instruction */ - if (kvmppc_read_inst(vcpu) == EMULATE_DONE) - /* Need to emulate */ - return EMULATE_FAIL; - - return EMULATE_AGAIN; -} - /* Handle external providers (FPU, Altivec, VSX) */ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, ulong msr) @@ -1149,31 +1113,49 @@ program_interrupt: case BOOK3S_INTERRUPT_VSX: { int ext_msr = 0; + int emul; + ulong pc; + u32 last_inst; + + if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) { + /* Do paired single instruction emulation */ + pc = kvmppc_get_pc(vcpu); + last_inst = kvmppc_get_last_inst(vcpu); + emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, + false); + if (emul == EMULATE_DONE) + goto program_interrupt; + else + r = RESUME_GUEST; - switch (exit_nr) { - case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break; - case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break; - case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break; + break; } - switch (kvmppc_check_ext(vcpu, exit_nr)) { - case EMULATE_DONE: - /* everything ok - let's enable the ext */ - r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); + /* Enable external provider */ + switch (exit_nr) { + case BOOK3S_INTERRUPT_FP_UNAVAIL: + ext_msr = MSR_FP; break; - case EMULATE_FAIL: - /* we need to emulate this instruction */ - goto program_interrupt; + + case BOOK3S_INTERRUPT_ALTIVEC: + ext_msr = MSR_VEC; break; - default: - /* nothing to worry about - go again */ + + case BOOK3S_INTERRUPT_VSX: + ext_msr = MSR_VSX; break; } + + r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); break; } case BOOK3S_INTERRUPT_ALIGNMENT: - if (kvmppc_read_inst(vcpu) == EMULATE_DONE) { - u32 last_inst = kvmppc_get_last_inst(vcpu); + { + ulong pc = kvmppc_get_pc(vcpu); + u32 last_inst = kvmppc_get_last_inst(vcpu); + int emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, false); + + if (emul == EMULATE_DONE) { u32 dsisr; u64 dar; @@ -1187,6 +1169,7 @@ program_interrupt: } r = RESUME_GUEST; break; + } #ifdef CONFIG_PPC_BOOK3S_64 case BOOK3S_INTERRUPT_FAC_UNAVAIL: kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56); -- 1.7.11.7 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1blp0189.outbound.protection.outlook.com [207.46.163.189]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 562B31A04AE for ; Thu, 24 Jul 2014 02:06:40 +1000 (EST) From: Mihai Caraman To: Subject: [PATCH v6 3/5] KVM: PPC: Book3s: Remove kvmppc_read_inst() function Date: Wed, 23 Jul 2014 19:06:20 +0300 Message-ID: <1406131582-6052-4-git-send-email-mihai.caraman@freescale.com> In-Reply-To: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> References: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: Mihai Caraman , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , In the context of replacing kvmppc_ld() function calls with a version of kvmppc_get_last_inst() which allow to fail, Alex Graf suggested this: "If we get EMULATE_AGAIN, we just have to make sure we go back into the guest. No need to inject an ISI into the guest - it'll do that all by itself. With an error returning kvmppc_get_last_inst we can just use completely get rid of kvmppc_read_inst() and only use kvmppc_get_last_inst() instead." As a intermediate step get rid of kvmppc_read_inst() and only use kvmppc_ld() instead. Signed-off-by: Mihai Caraman --- v6: - add proper comments for VSX interrupt handling v5: - make paired single emulation the unusual v4: - new patch arch/powerpc/kvm/book3s_pr.c | 85 ++++++++++++++++++-------------------------- 1 file changed, 34 insertions(+), 51 deletions(-) diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index e40765f..e76aec3 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -710,42 +710,6 @@ static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac) #endif } -static int kvmppc_read_inst(struct kvm_vcpu *vcpu) -{ - ulong srr0 = kvmppc_get_pc(vcpu); - u32 last_inst = kvmppc_get_last_inst(vcpu); - int ret; - - ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); - if (ret == -ENOENT) { - ulong msr = kvmppc_get_msr(vcpu); - - msr = kvmppc_set_field(msr, 33, 33, 1); - msr = kvmppc_set_field(msr, 34, 36, 0); - msr = kvmppc_set_field(msr, 42, 47, 0); - kvmppc_set_msr_fast(vcpu, msr); - kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE); - return EMULATE_AGAIN; - } - - return EMULATE_DONE; -} - -static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr) -{ - - /* Need to do paired single emulation? */ - if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)) - return EMULATE_DONE; - - /* Read out the instruction */ - if (kvmppc_read_inst(vcpu) == EMULATE_DONE) - /* Need to emulate */ - return EMULATE_FAIL; - - return EMULATE_AGAIN; -} - /* Handle external providers (FPU, Altivec, VSX) */ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, ulong msr) @@ -1149,31 +1113,49 @@ program_interrupt: case BOOK3S_INTERRUPT_VSX: { int ext_msr = 0; + int emul; + ulong pc; + u32 last_inst; + + if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) { + /* Do paired single instruction emulation */ + pc = kvmppc_get_pc(vcpu); + last_inst = kvmppc_get_last_inst(vcpu); + emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, + false); + if (emul == EMULATE_DONE) + goto program_interrupt; + else + r = RESUME_GUEST; - switch (exit_nr) { - case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break; - case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break; - case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break; + break; } - switch (kvmppc_check_ext(vcpu, exit_nr)) { - case EMULATE_DONE: - /* everything ok - let's enable the ext */ - r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); + /* Enable external provider */ + switch (exit_nr) { + case BOOK3S_INTERRUPT_FP_UNAVAIL: + ext_msr = MSR_FP; break; - case EMULATE_FAIL: - /* we need to emulate this instruction */ - goto program_interrupt; + + case BOOK3S_INTERRUPT_ALTIVEC: + ext_msr = MSR_VEC; break; - default: - /* nothing to worry about - go again */ + + case BOOK3S_INTERRUPT_VSX: + ext_msr = MSR_VSX; break; } + + r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); break; } case BOOK3S_INTERRUPT_ALIGNMENT: - if (kvmppc_read_inst(vcpu) == EMULATE_DONE) { - u32 last_inst = kvmppc_get_last_inst(vcpu); + { + ulong pc = kvmppc_get_pc(vcpu); + u32 last_inst = kvmppc_get_last_inst(vcpu); + int emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, false); + + if (emul == EMULATE_DONE) { u32 dsisr; u64 dar; @@ -1187,6 +1169,7 @@ program_interrupt: } r = RESUME_GUEST; break; + } #ifdef CONFIG_PPC_BOOK3S_64 case BOOK3S_INTERRUPT_FAC_UNAVAIL: kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56); -- 1.7.11.7 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mihai Caraman Date: Wed, 23 Jul 2014 16:06:20 +0000 Subject: [PATCH v6 3/5] KVM: PPC: Book3s: Remove kvmppc_read_inst() function Message-Id: <1406131582-6052-4-git-send-email-mihai.caraman@freescale.com> List-Id: References: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> In-Reply-To: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ppc@vger.kernel.org Cc: kvm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Mihai Caraman In the context of replacing kvmppc_ld() function calls with a version of kvmppc_get_last_inst() which allow to fail, Alex Graf suggested this: "If we get EMULATE_AGAIN, we just have to make sure we go back into the guest. No need to inject an ISI into the guest - it'll do that all by itself. With an error returning kvmppc_get_last_inst we can just use completely get rid of kvmppc_read_inst() and only use kvmppc_get_last_inst() instead." As a intermediate step get rid of kvmppc_read_inst() and only use kvmppc_ld() instead. Signed-off-by: Mihai Caraman --- v6: - add proper comments for VSX interrupt handling v5: - make paired single emulation the unusual v4: - new patch arch/powerpc/kvm/book3s_pr.c | 85 ++++++++++++++++++-------------------------- 1 file changed, 34 insertions(+), 51 deletions(-) diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index e40765f..e76aec3 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -710,42 +710,6 @@ static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac) #endif } -static int kvmppc_read_inst(struct kvm_vcpu *vcpu) -{ - ulong srr0 = kvmppc_get_pc(vcpu); - u32 last_inst = kvmppc_get_last_inst(vcpu); - int ret; - - ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); - if (ret = -ENOENT) { - ulong msr = kvmppc_get_msr(vcpu); - - msr = kvmppc_set_field(msr, 33, 33, 1); - msr = kvmppc_set_field(msr, 34, 36, 0); - msr = kvmppc_set_field(msr, 42, 47, 0); - kvmppc_set_msr_fast(vcpu, msr); - kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE); - return EMULATE_AGAIN; - } - - return EMULATE_DONE; -} - -static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr) -{ - - /* Need to do paired single emulation? */ - if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)) - return EMULATE_DONE; - - /* Read out the instruction */ - if (kvmppc_read_inst(vcpu) = EMULATE_DONE) - /* Need to emulate */ - return EMULATE_FAIL; - - return EMULATE_AGAIN; -} - /* Handle external providers (FPU, Altivec, VSX) */ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, ulong msr) @@ -1149,31 +1113,49 @@ program_interrupt: case BOOK3S_INTERRUPT_VSX: { int ext_msr = 0; + int emul; + ulong pc; + u32 last_inst; + + if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) { + /* Do paired single instruction emulation */ + pc = kvmppc_get_pc(vcpu); + last_inst = kvmppc_get_last_inst(vcpu); + emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, + false); + if (emul = EMULATE_DONE) + goto program_interrupt; + else + r = RESUME_GUEST; - switch (exit_nr) { - case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break; - case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break; - case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break; + break; } - switch (kvmppc_check_ext(vcpu, exit_nr)) { - case EMULATE_DONE: - /* everything ok - let's enable the ext */ - r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); + /* Enable external provider */ + switch (exit_nr) { + case BOOK3S_INTERRUPT_FP_UNAVAIL: + ext_msr = MSR_FP; break; - case EMULATE_FAIL: - /* we need to emulate this instruction */ - goto program_interrupt; + + case BOOK3S_INTERRUPT_ALTIVEC: + ext_msr = MSR_VEC; break; - default: - /* nothing to worry about - go again */ + + case BOOK3S_INTERRUPT_VSX: + ext_msr = MSR_VSX; break; } + + r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); break; } case BOOK3S_INTERRUPT_ALIGNMENT: - if (kvmppc_read_inst(vcpu) = EMULATE_DONE) { - u32 last_inst = kvmppc_get_last_inst(vcpu); + { + ulong pc = kvmppc_get_pc(vcpu); + u32 last_inst = kvmppc_get_last_inst(vcpu); + int emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, false); + + if (emul = EMULATE_DONE) { u32 dsisr; u64 dar; @@ -1187,6 +1169,7 @@ program_interrupt: } r = RESUME_GUEST; break; + } #ifdef CONFIG_PPC_BOOK3S_64 case BOOK3S_INTERRUPT_FAC_UNAVAIL: kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56); -- 1.7.11.7