From patchwork Wed Jul 23 16:06:20 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mihai Caraman X-Patchwork-Id: 372996 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id D84DD1401B0 for ; Thu, 24 Jul 2014 02:06:46 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758258AbaGWQGl (ORCPT ); Wed, 23 Jul 2014 12:06:41 -0400 Received: from mail-bn1blp0184.outbound.protection.outlook.com ([207.46.163.184]:36841 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758068AbaGWQGg (ORCPT ); Wed, 23 Jul 2014 12:06:36 -0400 Received: from BN3PR0301CA0024.namprd03.prod.outlook.com (25.160.180.162) by BLUPR03MB503.namprd03.prod.outlook.com (10.141.80.22) with Microsoft SMTP Server (TLS) id 15.0.990.7; Wed, 23 Jul 2014 16:06:33 +0000 Received: from BL2FFO11FD038.protection.gbl (2a01:111:f400:7c09::168) by BN3PR0301CA0024.outlook.office365.com (2a01:111:e400:4000::34) with Microsoft SMTP Server (TLS) id 15.0.990.7 via Frontend Transport; Wed, 23 Jul 2014 16:06:33 +0000 Received: from tx30smr01.am.freescale.net (192.88.168.50) by BL2FFO11FD038.mail.protection.outlook.com (10.173.161.134) with Microsoft SMTP Server (TLS) id 15.0.980.11 via Frontend Transport; Wed, 23 Jul 2014 16:06:32 +0000 Received: from fsr-fed1764-012.ea.freescale.net (fsr-fed1764-012-010171073213.ea.freescale.net [10.171.73.213]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id s6NG6QRm019268; Wed, 23 Jul 2014 09:06:31 -0700 From: Mihai Caraman To: CC: , , 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> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> References: <1406131582-6052-1-git-send-email-mihai.caraman@freescale.com> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.168.50; CTRY:US; IPV:CAL; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(6009001)(189002)(199002)(64706001)(92726001)(81542001)(47776003)(50226001)(2351001)(74502001)(74662001)(76482001)(80022001)(77982001)(81342001)(26826002)(97736001)(107046002)(95666004)(79102001)(105606002)(20776003)(92566001)(102836001)(83072002)(110136001)(229853001)(77156001)(104166001)(48376002)(87286001)(46102001)(89996001)(88136002)(106466001)(85852003)(104016003)(36756003)(50986999)(76176999)(93916002)(86362001)(83322001)(87936001)(84676001)(68736004)(19580395003)(99396002)(44976005)(4396001)(50466002)(6806004)(33646002)(62966002)(19580405001)(21056001)(85306003)(31966008)(32563001); DIR:OUT; SFP:; SCL:1; SRVR:BLUPR03MB503; H:tx30smr01.am.freescale.net; FPR:; MLV:ovrnspm; PTR:InfoDomainNonexistent; MX:1; LANG:en; MIME-Version: 1.0 X-Microsoft-Antispam: BCL:0;PCL:0;RULEID: X-Forefront-PRVS: 028166BF91 Received-SPF: Fail (: domain of freescale.com does not designate 192.88.168.50 as permitted sender) receiver=; client-ip=192.88.168.50; helo=tx30smr01.am.freescale.net; Authentication-Results: spf=fail (sender IP is 192.88.168.50) smtp.mailfrom=mihai.caraman@freescale.com; X-OriginatorOrg: freescale.com Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@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);