From patchwork Fri Oct 4 10:51:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 1171752 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46l7Cl5ZxKz9sPd for ; Fri, 4 Oct 2019 21:37:55 +1000 (AEST) Received: from localhost ([::1]:46838 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iGLuB-0003C3-In for incoming@patchwork.ozlabs.org; Fri, 04 Oct 2019 07:37:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44528) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iGLBb-00073S-9X for qemu-devel@nongnu.org; Fri, 04 Oct 2019 06:51:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iGLBW-00056o-LB for qemu-devel@nongnu.org; Fri, 04 Oct 2019 06:51:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43856) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iGLBR-00052r-JB; Fri, 04 Oct 2019 06:51:39 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4838E18CB906; Fri, 4 Oct 2019 10:51:35 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-35.ams2.redhat.com [10.36.116.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id A416C5D6B2; Fri, 4 Oct 2019 10:51:31 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v4 7/7] s390x/mmu: Convert to non-recursive page table walk Date: Fri, 4 Oct 2019 12:51:02 +0200 Message-Id: <20191004105102.15821-8-david@redhat.com> In-Reply-To: <20191004105102.15821-1-david@redhat.com> References: <20191004105102.15821-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.63]); Fri, 04 Oct 2019 10:51:35 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth , Janosch Frank , David Hildenbrand , Cornelia Huck , Richard Henderson , Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" A non-recursive implementation allows to make better use of the branch predictor, avoids function calls, and makes the implementation of new features only for a subset of region table levels easier. We can now directly compare our implementation to the KVM gaccess implementation in arch/s390/kvm/gaccess.c:guest_translate(). Reviewed-by: Richard Henderson Signed-off-by: David Hildenbrand Reviewed-by: Thomas Huth --- target/s390x/mmu_helper.c | 208 ++++++++++++++++++++------------------ 1 file changed, 108 insertions(+), 100 deletions(-) diff --git a/target/s390x/mmu_helper.c b/target/s390x/mmu_helper.c index a114fb1628..dc33c63b1d 100644 --- a/target/s390x/mmu_helper.c +++ b/target/s390x/mmu_helper.c @@ -114,107 +114,16 @@ static inline bool read_table_entry(CPUS390XState *env, hwaddr gaddr, return true; } -/* Decode page table entry (normal 4KB page) */ -static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr, - uint64_t asc, uint64_t pt_entry, - target_ulong *raddr, int *flags, int rw, bool exc) -{ - if (pt_entry & PAGE_ENTRY_I) { - return PGM_PAGE_TRANS; - } - if (pt_entry & PAGE_ENTRY_0) { - return PGM_TRANS_SPEC; - } - if (pt_entry & PAGE_ENTRY_P) { - *flags &= ~PAGE_WRITE; - } - - *raddr = pt_entry & TARGET_PAGE_MASK; - return 0; -} - -/* Decode segment table entry */ -static int mmu_translate_segment(CPUS390XState *env, target_ulong vaddr, - uint64_t asc, uint64_t st_entry, - target_ulong *raddr, int *flags, int rw, - bool exc) -{ - uint64_t origin, offs, pt_entry; - - if (st_entry & SEGMENT_ENTRY_P) { - *flags &= ~PAGE_WRITE; - } - - if ((st_entry & SEGMENT_ENTRY_FC) && (env->cregs[0] & CR0_EDAT)) { - /* Decode EDAT1 segment frame absolute address (1MB page) */ - *raddr = (st_entry & SEGMENT_ENTRY_SFAA) | - (vaddr & ~SEGMENT_ENTRY_SFAA); - return 0; - } - - /* Look up 4KB page entry */ - origin = st_entry & SEGMENT_ENTRY_ORIGIN; - offs = VADDR_PAGE_TX(vaddr) * 8; - if (!read_table_entry(env, origin + offs, &pt_entry)) { - return PGM_ADDRESSING; - } - return mmu_translate_pte(env, vaddr, asc, pt_entry, raddr, flags, rw, exc); -} - -/* Decode region table entries */ -static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr, - uint64_t asc, uint64_t entry, int level, - target_ulong *raddr, int *flags, int rw, - bool exc) -{ - uint64_t origin, offs, new_entry; - const int pchks[4] = { - PGM_SEGMENT_TRANS, PGM_REG_THIRD_TRANS, - PGM_REG_SEC_TRANS, PGM_REG_FIRST_TRANS - }; - - origin = entry & REGION_ENTRY_ORIGIN; - offs = (vaddr >> (17 + 11 * level / 4)) & 0x3ff8; - - if (!read_table_entry(env, origin + offs, &new_entry)) { - return PGM_ADDRESSING; - } - - if (new_entry & REGION_ENTRY_I) { - return pchks[level / 4]; - } - - if ((new_entry & REGION_ENTRY_TT) != level) { - return PGM_TRANS_SPEC; - } - - if (level == ASCE_TYPE_SEGMENT) { - return mmu_translate_segment(env, vaddr, asc, new_entry, raddr, flags, - rw, exc); - } - - /* Check region table offset and length */ - offs = (vaddr >> (28 + 11 * (level - 4) / 4)) & 3; - if (offs < ((new_entry & REGION_ENTRY_TF) >> 6) - || offs > (new_entry & REGION_ENTRY_TL)) { - return pchks[level / 4 - 1]; - } - - if ((env->cregs[0] & CR0_EDAT) && (new_entry & REGION_ENTRY_P)) { - *flags &= ~PAGE_WRITE; - } - - /* yet another region */ - return mmu_translate_region(env, vaddr, asc, new_entry, level - 4, - raddr, flags, rw, exc); -} - static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, uint64_t asc, uint64_t asce, target_ulong *raddr, int *flags, int rw, bool exc) { + const bool edat1 = (env->cregs[0] & CR0_EDAT) && + s390_has_feat(S390_FEAT_EDAT); const int asce_tl = asce & ASCE_TABLE_LENGTH; - int level; + const int asce_p = asce & ASCE_PRIVATE_SPACE; + hwaddr gaddr = asce & ASCE_ORIGIN; + uint64_t entry; if (asce & ASCE_REAL_SPACE) { /* direct mapping */ @@ -222,12 +131,12 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, return 0; } - level = asce & ASCE_TYPE_MASK; - switch (level) { + switch (asce & ASCE_TYPE_MASK) { case ASCE_TYPE_REGION1: if (VADDR_REGION1_TL(vaddr) > asce_tl) { return PGM_REG_FIRST_TRANS; } + gaddr += VADDR_REGION1_TX(vaddr) * 8; break; case ASCE_TYPE_REGION2: if (VADDR_REGION1_TX(vaddr)) { @@ -236,6 +145,7 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, if (VADDR_REGION2_TL(vaddr) > asce_tl) { return PGM_REG_SEC_TRANS; } + gaddr += VADDR_REGION2_TX(vaddr) * 8; break; case ASCE_TYPE_REGION3: if (VADDR_REGION1_TX(vaddr) || VADDR_REGION2_TX(vaddr)) { @@ -244,6 +154,7 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, if (VADDR_REGION3_TL(vaddr) > asce_tl) { return PGM_REG_THIRD_TRANS; } + gaddr += VADDR_REGION3_TX(vaddr) * 8; break; case ASCE_TYPE_SEGMENT: if (VADDR_REGION1_TX(vaddr) || VADDR_REGION2_TX(vaddr) || @@ -253,11 +164,108 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, if (VADDR_SEGMENT_TL(vaddr) > asce_tl) { return PGM_SEGMENT_TRANS; } + gaddr += VADDR_SEGMENT_TX(vaddr) * 8; + break; + } + + switch (asce & ASCE_TYPE_MASK) { + case ASCE_TYPE_REGION1: + if (!read_table_entry(env, gaddr, &entry)) { + return PGM_ADDRESSING; + } + if (entry & REGION_ENTRY_I) { + return PGM_REG_FIRST_TRANS; + } + if ((entry & REGION_ENTRY_TT) != REGION_ENTRY_TT_REGION1) { + return PGM_TRANS_SPEC; + } + if (VADDR_REGION2_TL(vaddr) < (entry & REGION_ENTRY_TF) >> 6 || + VADDR_REGION2_TL(vaddr) > (entry & REGION_ENTRY_TL)) { + return PGM_REG_SEC_TRANS; + } + if (edat1 && (entry & REGION_ENTRY_P)) { + *flags &= ~PAGE_WRITE; + } + gaddr = (entry & REGION_ENTRY_ORIGIN) + VADDR_REGION2_TX(vaddr) * 8; + /* fall through */ + case ASCE_TYPE_REGION2: + if (!read_table_entry(env, gaddr, &entry)) { + return PGM_ADDRESSING; + } + if (entry & REGION_ENTRY_I) { + return PGM_REG_SEC_TRANS; + } + if ((entry & REGION_ENTRY_TT) != REGION_ENTRY_TT_REGION2) { + return PGM_TRANS_SPEC; + } + if (VADDR_REGION3_TL(vaddr) < (entry & REGION_ENTRY_TF) >> 6 || + VADDR_REGION3_TL(vaddr) > (entry & REGION_ENTRY_TL)) { + return PGM_REG_THIRD_TRANS; + } + if (edat1 && (entry & REGION_ENTRY_P)) { + *flags &= ~PAGE_WRITE; + } + gaddr = (entry & REGION_ENTRY_ORIGIN) + VADDR_REGION3_TX(vaddr) * 8; + /* fall through */ + case ASCE_TYPE_REGION3: + if (!read_table_entry(env, gaddr, &entry)) { + return PGM_ADDRESSING; + } + if (entry & REGION_ENTRY_I) { + return PGM_REG_THIRD_TRANS; + } + if ((entry & REGION_ENTRY_TT) != REGION_ENTRY_TT_REGION3) { + return PGM_TRANS_SPEC; + } + if (VADDR_SEGMENT_TL(vaddr) < (entry & REGION_ENTRY_TF) >> 6 || + VADDR_SEGMENT_TL(vaddr) > (entry & REGION_ENTRY_TL)) { + return PGM_SEGMENT_TRANS; + } + if (edat1 && (entry & REGION_ENTRY_P)) { + *flags &= ~PAGE_WRITE; + } + gaddr = (entry & REGION_ENTRY_ORIGIN) + VADDR_SEGMENT_TX(vaddr) * 8; + /* fall through */ + case ASCE_TYPE_SEGMENT: + if (!read_table_entry(env, gaddr, &entry)) { + return PGM_ADDRESSING; + } + if (entry & SEGMENT_ENTRY_I) { + return PGM_SEGMENT_TRANS; + } + if ((entry & SEGMENT_ENTRY_TT) != SEGMENT_ENTRY_TT_SEGMENT) { + return PGM_TRANS_SPEC; + } + if ((entry & SEGMENT_ENTRY_CS) && asce_p) { + return PGM_TRANS_SPEC; + } + if (entry & SEGMENT_ENTRY_P) { + *flags &= ~PAGE_WRITE; + } + if (edat1 && (entry & SEGMENT_ENTRY_FC)) { + *raddr = (entry & SEGMENT_ENTRY_SFAA) | + (vaddr & ~SEGMENT_ENTRY_SFAA); + return 0; + } + gaddr = (entry & SEGMENT_ENTRY_ORIGIN) + VADDR_PAGE_TX(vaddr) * 8; break; } - return mmu_translate_region(env, vaddr, asc, asce, level, raddr, flags, rw, - exc); + if (!read_table_entry(env, gaddr, &entry)) { + return PGM_ADDRESSING; + } + if (entry & PAGE_ENTRY_I) { + return PGM_PAGE_TRANS; + } + if (entry & PAGE_ENTRY_0) { + return PGM_TRANS_SPEC; + } + if (entry & PAGE_ENTRY_P) { + *flags &= ~PAGE_WRITE; + } + + *raddr = entry & TARGET_PAGE_MASK; + return 0; } static void mmu_handle_skey(target_ulong addr, int rw, int *flags)