From patchwork Fri Oct 30 15:47:13 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 56653 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n9UFmX1S006284 for ; Fri, 30 Oct 2009 15:48:33 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932524AbZJ3Prm (ORCPT ); Fri, 30 Oct 2009 11:47:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932519AbZJ3Prl (ORCPT ); Fri, 30 Oct 2009 11:47:41 -0400 Received: from cantor.suse.de ([195.135.220.2]:53068 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932470AbZJ3Pr2 (ORCPT ); Fri, 30 Oct 2009 11:47:28 -0400 Received: from relay1.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.suse.de (Postfix) with ESMTP id 91AF794430; Fri, 30 Oct 2009 16:47:31 +0100 (CET) From: Alexander Graf To: kvm@vger.kernel.org Cc: Avi Kivity , kvm-ppc , Hollis Blanchard , Arnd Bergmann , Benjamin Herrenschmidt , Kevin Wolf , bphilips@suse.de, Marcelo Tosatti , Olof Johansson , linuxppc-dev@ozlabs.org Subject: [PATCH 13/27] Add book3s_32 guest MMU Date: Fri, 30 Oct 2009 16:47:13 +0100 Message-Id: <1256917647-6200-14-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1256917647-6200-1-git-send-email-agraf@suse.de> References: <1256917647-6200-1-git-send-email-agraf@suse.de> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c new file mode 100644 index 0000000..faf99f2 --- /dev/null +++ b/arch/powerpc/kvm/book3s_32_mmu.c @@ -0,0 +1,372 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright SUSE Linux Products GmbH 2009 + * + * Authors: Alexander Graf + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +/* #define DEBUG_MMU */ +/* #define DEBUG_MMU_PTE */ +/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ + +#ifdef DEBUG_MMU +#define dprintk(X...) printk(KERN_INFO X) +#else +#define dprintk(X...) do { } while(0) +#endif + +#ifdef DEBUG_PTE +#define dprintk_pte(X...) printk(KERN_INFO X) +#else +#define dprintk_pte(X...) do { } while(0) +#endif + +#define PTEG_FLAG_ACCESSED 0x00000100 +#define PTEG_FLAG_DIRTY 0x00000080 + +static inline bool check_debug_ip(struct kvm_vcpu *vcpu) +{ +#ifdef DEBUG_MMU_PTE_IP + return vcpu->arch.pc == DEBUG_MMU_PTE_IP; +#else + return true; +#endif +} + +static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *pte, bool data); + +static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr) +{ + return &vcpu_book3s->sr[(eaddr >> 28) & 0xf]; +} + +static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, + bool data) +{ + struct kvmppc_sr *sre = find_sr(to_book3s(vcpu), eaddr); + struct kvmppc_pte pte; + + if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data)) + return pte.vpage; + + return (((u64)eaddr >> 12) & 0xffff) | (((u64)sre->vsid) << 16); +} + +static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) +{ + kvmppc_set_msr(vcpu, 0); +} + +static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s, + struct kvmppc_sr *sre, gva_t eaddr, + bool primary) +{ + u32 page, hash, pteg, htabmask; + hva_t r; + + page = (eaddr & 0x0FFFFFFF) >> 12; + htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; + + hash = ((sre->vsid ^ page) << 6); + if (!primary) + hash = ~hash; + hash &= htabmask; + + pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; + + dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", + vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg, + sre->vsid); + + r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT); + if (kvm_is_error_hva(r)) + return r; + return r | (pteg & ~PAGE_MASK); +} + +static u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr, + bool primary) +{ + return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) | + (primary ? 0 : 0x40) | 0x80000000; +} + +static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *pte, bool data) +{ + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + struct kvmppc_bat *bat; + int i; + + for (i = 0; i < 8; i++) { + if (data) + bat = &vcpu_book3s->dbat[i]; + else + bat = &vcpu_book3s->ibat[i]; + + if (vcpu->arch.msr & MSR_PR) { + if (!bat->vp) + continue; + } else { + if (!bat->vs) + continue; + } + + if (check_debug_ip(vcpu)) + { + dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", + data ? 'd' : 'i', i, eaddr, bat->bepi, + bat->bepi_mask); + } + if ((eaddr & bat->bepi_mask) == bat->bepi) { + pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); + pte->vpage = (eaddr >> 12) | VSID_BAT; + pte->may_read = bat->pp; + pte->may_write = bat->pp > 1; + pte->may_execute = true; + if (!pte->may_read) { + printk(KERN_INFO "BAT is not readable!\n"); + continue; + } + if (!pte->may_write) { + /* let's treat r/o BATs as not-readable for now */ + dprintk_pte("BAT is read-only!\n"); + continue; + } + + return 0; + } + } + + return -ENOENT; +} + +static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *pte, bool data, + bool primary) +{ + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + struct kvmppc_sr *sre; + hva_t ptegp; + u32 pteg[16]; + u64 ptem = 0; + int i; + int found = 0; + + sre = find_sr(vcpu_book3s, eaddr); + + dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, + sre->vsid, sre->raw); + + pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); + + ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary); + if (kvm_is_error_hva(ptegp)) { + printk(KERN_INFO "KVM: Invalid PTEG!\n"); + goto no_page_found; + } + + ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); + + if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { + printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp); + goto no_page_found; + } + + for (i=0; i<16; i+=2) { + if (ptem == pteg[i]) { + u8 pp; + + pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF); + pp = pteg[i+1] & 3; + + if ((sre->Kp && (vcpu->arch.msr & MSR_PR)) || + (sre->Ks && !(vcpu->arch.msr & MSR_PR))) + pp |= 4; + + pte->may_write = false; + pte->may_read = false; + pte->may_execute = true; + switch (pp) { + case 0: + case 1: + case 2: + case 6: + pte->may_write = true; + case 3: + case 5: + case 7: + pte->may_read = true; + break; + } + + if ( !pte->may_read ) + continue; + + dprintk_pte("MMU: Found PTE -> %x %x - %x\n", + pteg[i], pteg[i+1], pp); + found = 1; + break; + } + } + + /* Update PTE C and A bits, so the guest's swapper knows we used the + page */ + if (found) { + u32 oldpte = pteg[i+1]; + + if (pte->may_read) + pteg[i+1] |= PTEG_FLAG_ACCESSED; + if (pte->may_write) + pteg[i+1] |= PTEG_FLAG_DIRTY; + else + dprintk_pte("KVM: Mapping read-only page!\n"); + + /* Write back into the PTEG */ + if (pteg[i+1] != oldpte) + copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); + + return 0; + } + +no_page_found: + + if (check_debug_ip(vcpu)) { + dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", + to_book3s(vcpu)->sdr1, ptegp); + for (i=0; i<16; i+=2) { + dprintk_pte(" %02d: 0x%x - 0x%x (0x%llx)\n", + i, pteg[i], pteg[i+1], ptem); + } + } + + return -ENOENT; +} + +static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *pte, bool data) +{ + int r; + + pte->eaddr = eaddr; + r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data); + if (r < 0) + r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true); + if (r < 0) + r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false); + + return r; +} + + +static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) +{ + return to_book3s(vcpu)->sr[srnum].raw; +} + +static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, + ulong value) +{ + struct kvmppc_sr *sre; + + sre = &to_book3s(vcpu)->sr[srnum]; + + /* Flush any left-over shadows from the previous SR */ + + /* XXX Not necessary? */ + /* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */ + + /* And then put in the new SR */ + sre->raw = value; + sre->vsid = (value & 0x0fffffff); + sre->Ks = (value & 0x40000000) ? true : false; + sre->Kp = (value & 0x20000000) ? true : false; + sre->nx = (value & 0x10000000) ? true : false; + + /* Map the new segment */ + kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); +} + +static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) +{ + kvmppc_mmu_pte_flush(vcpu, ea, ~0xFFFULL); +} + +static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid, + u64 *vsid) +{ + /* In case we only have one of MSR_IR or MSR_DR set, let's put + that in the real-mode context (and hope RM doesn't access + high memory) */ + switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { + case 0: + *vsid = (VSID_REAL >> 16) | esid; + break; + case MSR_IR: + *vsid = (VSID_REAL_IR >> 16) | esid; + break; + case MSR_DR: + *vsid = (VSID_REAL_DR >> 16) | esid; + break; + case MSR_DR|MSR_IR: + { + ulong ea; + ea = esid << SID_SHIFT; + *vsid = find_sr(to_book3s(vcpu), ea)->vsid; + break; + } + default: + BUG(); + } + + return 0; +} + +static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) +{ + return true; +} + + +void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) +{ + struct kvmppc_mmu *mmu = &vcpu->arch.mmu; + + mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; + mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; + mmu->xlate = kvmppc_mmu_book3s_32_xlate; + mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; + mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; + mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; + mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; + mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; + + mmu->slbmte = NULL; + mmu->slbmfee = NULL; + mmu->slbmfev = NULL; + mmu->slbie = NULL; + mmu->slbia = NULL; +}