From patchwork Wed Oct 18 13:07:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 1850807 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=C0ms0ALY; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) 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=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4S9WRx5zzFz20cx for ; Thu, 19 Oct 2023 00:10:37 +1100 (AEDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qt6IH-0006vP-BF; Wed, 18 Oct 2023 09:09:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qt6HR-0004Yn-CZ for qemu-devel@nongnu.org; Wed, 18 Oct 2023 09:08:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qt6HO-00082S-D3 for qemu-devel@nongnu.org; Wed, 18 Oct 2023 09:08:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697634483; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yj9gQaLJTWM6hnSDXKzT3FnPrtISxGk/IFyB5lGZKQg=; b=C0ms0ALYPIEyMSrbyI+I7NqKn7+pAPNkuD5uLqA06dO12I9Ee8+hKkA6tAXC268EgTxhqF p9cKF1FRv+z61vHYdGPQIwDOqc/qK6Ocvuox3t+3Wjh9CrqXH3cuvl6YEuSLd9oXrWt47z JB366lphJGpwo+PhZ+J7hy9xDBjHwdM= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-371-4KV0oM2hNPOuaviaQaH4qQ-1; Wed, 18 Oct 2023 09:08:00 -0400 X-MC-Unique: 4KV0oM2hNPOuaviaQaH4qQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D15BC1DD35E4; Wed, 18 Oct 2023 13:07:59 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.192.109]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8593620268C8; Wed, 18 Oct 2023 13:07:58 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , qemu-s390x@nongnu.org, Nina Schoetterl-Glausch Subject: [PULL 24/25] target/s390x/kvm: Simplify the GPRs, ACRs, CRs and prefix synchronization code Date: Wed, 18 Oct 2023 15:07:15 +0200 Message-ID: <20231018130716.286638-25-thuth@redhat.com> In-Reply-To: <20231018130716.286638-1-thuth@redhat.com> References: <20231018130716.286638-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org KVM_SYNC_GPRS, KVM_SYNC_ACRS, KVM_SYNC_CRS and KVM_SYNC_PREFIX are available since kernel 3.10. Since we already require at least kernel 3.15 in the s390x KVM code, we can also assume that the KVM_CAP_SYNC_REGS sync code is always possible for these registers, and remove the related checks and fallbacks via KVM_SET_REGS and KVM_GET_REGS. Message-ID: <20231011080538.796999-3-thuth@redhat.com> Signed-off-by: Thomas Huth --- target/s390x/kvm/kvm.c | 106 ++++++++++------------------------------- 1 file changed, 24 insertions(+), 82 deletions(-) diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index 068e9826e1..0f0e784b2a 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -139,7 +139,6 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = { KVM_CAP_LAST_INFO }; -static int cap_sync_regs; static int cap_async_pf; static int cap_mem_op; static int cap_mem_op_extension; @@ -360,7 +359,6 @@ int kvm_arch_init(MachineState *ms, KVMState *s) return -1; } - cap_sync_regs = true; cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF); cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP); cap_mem_op_extension = kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EXTENSION); @@ -468,37 +466,28 @@ void kvm_s390_reset_vcpu_normal(S390CPU *cpu) static int can_sync_regs(CPUState *cs, int regs) { - return cap_sync_regs && (cs->kvm_run->kvm_valid_regs & regs) == regs; + return (cs->kvm_run->kvm_valid_regs & regs) == regs; } +#define KVM_SYNC_REQUIRED_REGS (KVM_SYNC_GPRS | KVM_SYNC_ACRS | \ + KVM_SYNC_CRS | KVM_SYNC_PREFIX) + int kvm_arch_put_registers(CPUState *cs, int level) { S390CPU *cpu = S390_CPU(cs); CPUS390XState *env = &cpu->env; - struct kvm_sregs sregs; - struct kvm_regs regs; struct kvm_fpu fpu = {}; int r; int i; + g_assert(can_sync_regs(cs, KVM_SYNC_REQUIRED_REGS)); + /* always save the PSW and the GPRS*/ cs->kvm_run->psw_addr = env->psw.addr; cs->kvm_run->psw_mask = env->psw.mask; - if (can_sync_regs(cs, KVM_SYNC_GPRS)) { - for (i = 0; i < 16; i++) { - cs->kvm_run->s.regs.gprs[i] = env->regs[i]; - cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS; - } - } else { - for (i = 0; i < 16; i++) { - regs.gprs[i] = env->regs[i]; - } - r = kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s); - if (r < 0) { - return r; - } - } + memcpy(cs->kvm_run->s.regs.gprs, env->regs, sizeof(cs->kvm_run->s.regs.gprs)); + cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS; if (can_sync_regs(cs, KVM_SYNC_VRS)) { for (i = 0; i < 32; i++) { @@ -531,6 +520,15 @@ int kvm_arch_put_registers(CPUState *cs, int level) return 0; } + /* + * Access registers, control registers and the prefix - these are + * always available via kvm_sync_regs in the kernels that we support + */ + memcpy(cs->kvm_run->s.regs.acrs, env->aregs, sizeof(cs->kvm_run->s.regs.acrs)); + memcpy(cs->kvm_run->s.regs.crs, env->cregs, sizeof(cs->kvm_run->s.regs.crs)); + cs->kvm_run->s.regs.prefix = env->psa; + cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS | KVM_SYNC_CRS | KVM_SYNC_PREFIX; + if (can_sync_regs(cs, KVM_SYNC_ARCH0)) { cs->kvm_run->s.regs.cputm = env->cputm; cs->kvm_run->s.regs.ckc = env->ckc; @@ -577,25 +575,6 @@ int kvm_arch_put_registers(CPUState *cs, int level) } } - /* access registers and control registers*/ - if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) { - for (i = 0; i < 16; i++) { - cs->kvm_run->s.regs.acrs[i] = env->aregs[i]; - cs->kvm_run->s.regs.crs[i] = env->cregs[i]; - } - cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS; - cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS; - } else { - for (i = 0; i < 16; i++) { - sregs.acrs[i] = env->aregs[i]; - sregs.crs[i] = env->cregs[i]; - } - r = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs); - if (r < 0) { - return r; - } - } - if (can_sync_regs(cs, KVM_SYNC_GSCB)) { memcpy(cs->kvm_run->s.regs.gscb, env->gscb, 32); cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GSCB; @@ -617,13 +596,6 @@ int kvm_arch_put_registers(CPUState *cs, int level) cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318; } - /* Finally the prefix */ - if (can_sync_regs(cs, KVM_SYNC_PREFIX)) { - cs->kvm_run->s.regs.prefix = env->psa; - cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX; - } else { - /* prefix is only supported via sync regs */ - } return 0; } @@ -631,8 +603,6 @@ int kvm_arch_get_registers(CPUState *cs) { S390CPU *cpu = S390_CPU(cs); CPUS390XState *env = &cpu->env; - struct kvm_sregs sregs; - struct kvm_regs regs; struct kvm_fpu fpu; int i, r; @@ -640,37 +610,14 @@ int kvm_arch_get_registers(CPUState *cs) env->psw.addr = cs->kvm_run->psw_addr; env->psw.mask = cs->kvm_run->psw_mask; - /* the GPRS */ - if (can_sync_regs(cs, KVM_SYNC_GPRS)) { - for (i = 0; i < 16; i++) { - env->regs[i] = cs->kvm_run->s.regs.gprs[i]; - } - } else { - r = kvm_vcpu_ioctl(cs, KVM_GET_REGS, ®s); - if (r < 0) { - return r; - } - for (i = 0; i < 16; i++) { - env->regs[i] = regs.gprs[i]; - } - } + /* the GPRS, ACRS and CRS */ + g_assert(can_sync_regs(cs, KVM_SYNC_REQUIRED_REGS)); + memcpy(env->regs, cs->kvm_run->s.regs.gprs, sizeof(env->regs)); + memcpy(env->aregs, cs->kvm_run->s.regs.acrs, sizeof(env->aregs)); + memcpy(env->cregs, cs->kvm_run->s.regs.crs, sizeof(env->cregs)); - /* The ACRS and CRS */ - if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) { - for (i = 0; i < 16; i++) { - env->aregs[i] = cs->kvm_run->s.regs.acrs[i]; - env->cregs[i] = cs->kvm_run->s.regs.crs[i]; - } - } else { - r = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs); - if (r < 0) { - return r; - } - for (i = 0; i < 16; i++) { - env->aregs[i] = sregs.acrs[i]; - env->cregs[i] = sregs.crs[i]; - } - } + /* The prefix */ + env->psa = cs->kvm_run->s.regs.prefix; /* Floating point and vector registers */ if (can_sync_regs(cs, KVM_SYNC_VRS)) { @@ -695,11 +642,6 @@ int kvm_arch_get_registers(CPUState *cs) env->fpc = fpu.fpc; } - /* The prefix */ - if (can_sync_regs(cs, KVM_SYNC_PREFIX)) { - env->psa = cs->kvm_run->s.regs.prefix; - } - if (can_sync_regs(cs, KVM_SYNC_ARCH0)) { env->cputm = cs->kvm_run->s.regs.cputm; env->ckc = cs->kvm_run->s.regs.ckc;