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Mon, 09 Oct 2023 13:08:09 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-653-1NSif-FOP0iKi3UqGhVFDw-1; Mon, 09 Oct 2023 13:07:49 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (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 219EC101A598; Mon, 9 Oct 2023 17:07:49 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.193.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id E009E40C6EA8; Mon, 9 Oct 2023 17:07:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696871284; 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=KDWuNECjxZQe7tH9w734/m/IFbVLLWaMNZcXVnndXYk=; b=PVRN1KepCKfaS65ngGJEWPMq6OgmgF7l4A6ZT9ZG+Lr5h0F4DI1aZvRMgYEISOHNCd1zTQ nsms7Fao/ACF0dFjEriLBd7M+4y9+zWhmwTHWQOh0L27bkR2gbS6gXD7QU5kWFXPbWTZdD ZtLXA8dnEfglCt2cJ7exXXHgLhv9sRc= X-MC-Unique: 1NSif-FOP0iKi3UqGhVFDw-1 From: Thomas Huth To: qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger Cc: qemu-s390x@nongnu.org, David Hildenbrand , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v2 1/2] target/s390x/kvm: Turn KVM_CAP_SYNC_REGS into a hard requirement Date: Mon, 9 Oct 2023 19:07:44 +0200 Message-ID: <20231009170745.63446-2-thuth@redhat.com> In-Reply-To: <20231009170745.63446-1-thuth@redhat.com> References: <20231009170745.63446-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696871344849100003 Content-Type: text/plain; charset="utf-8" Since we already require at least kernel 3.15 in the s390x KVM code, we can assume that the KVM_CAP_SYNC_REGS capability is always there. Thus turn this into a hard requirement now. Signed-off-by: Thomas Huth Reviewed-by: Christian Borntraeger --- target/s390x/kvm/kvm.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index bc5c56a305..b3e2eaa2eb 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -337,21 +337,29 @@ int kvm_arch_get_default_type(MachineState *ms) =20 int kvm_arch_init(MachineState *ms, KVMState *s) { + int required_caps[] =3D { + KVM_CAP_DEVICE_CTRL, + KVM_CAP_SYNC_REGS, + }; + + for (int i =3D 0; i < ARRAY_SIZE(required_caps); i++) { + if (!kvm_check_extension(s, required_caps[i])) { + error_report("KVM is missing capability #%d - " + "please use kernel 3.15 or newer", required_caps[= i]); + return -1; + } + } + object_class_foreach(ccw_machine_class_foreach, TYPE_S390_CCW_MACHINE, false, NULL); =20 - if (!kvm_check_extension(kvm_state, KVM_CAP_DEVICE_CTRL)) { - error_report("KVM is missing capability KVM_CAP_DEVICE_CTRL - " - "please use kernel 3.15 or newer"); - return -1; - } if (!kvm_check_extension(s, KVM_CAP_S390_COW)) { error_report("KVM is missing capability KVM_CAP_S390_COW - " "unsupported environment"); return -1; } =20 - cap_sync_regs =3D kvm_check_extension(s, KVM_CAP_SYNC_REGS); + cap_sync_regs =3D true; cap_async_pf =3D kvm_check_extension(s, KVM_CAP_ASYNC_PF); cap_mem_op =3D kvm_check_extension(s, KVM_CAP_S390_MEM_OP); cap_mem_op_extension =3D kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EX= TENSION); --=20 2.41.0 From nobody Tue Feb 10 00:03:09 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696871327; cv=none; d=zohomail.com; s=zohoarc; b=JGYJ8yUwrjpYcnYvgQXOXbHeX59odbO5YS2RMiOXRFp6NaAxJWbVVAbQQBd8ZkojMgzl/47jz7s00xmLkVKDEKmnY9b5tqnRaYT5ogUY/QrmcC9d8qbQUH8ucWTBdM4DhyvKebCE4reAG8ZmXeeDN3UeB+E9RftQY5hrRe7KmJs= ARC-Message-Signature: i=1; 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Mon, 9 Oct 2023 17:07:50 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.193.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 65DBC40C6EA8; Mon, 9 Oct 2023 17:07:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696871274; 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=1nrI/pS1tlbTbnzT6HSVcZk5Zmr4H9QlO5j6QPi+r3U=; b=UTY98TY5wnPU+inG7Re96BYsZZs2truaTWVYsnk9uw0aF6xNSyMzzpJA9t2dGiItIunbiC V8YDMGUnLpkLd51aPs6lsYAGduOy/8a7unDCD14Ivv2Q+DZ1DRmhvap9xcIKr+wdSomwww sewFPqZolipGSzD55O665odETRr2KqU= X-MC-Unique: -t22EXSSPuaTQM5uBrFnUA-1 From: Thomas Huth To: qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger Cc: qemu-s390x@nongnu.org, David Hildenbrand , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v2 2/2] target/s390x/kvm: Simplify the GPRs, ACRs, CRs and prefix synchronization code Date: Mon, 9 Oct 2023 19:07:45 +0200 Message-ID: <20231009170745.63446-3-thuth@redhat.com> In-Reply-To: <20231009170745.63446-1-thuth@redhat.com> References: <20231009170745.63446-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696871328841100002 Content-Type: text/plain; charset="utf-8" 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. Signed-off-by: Thomas Huth --- target/s390x/kvm/kvm.c | 102 ++++++++--------------------------------- 1 file changed, 20 insertions(+), 82 deletions(-) diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index b3e2eaa2eb..b988fc3abb 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -138,7 +138,6 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[= ] =3D { KVM_CAP_LAST_INFO }; =20 -static int cap_sync_regs; static int cap_async_pf; static int cap_mem_op; static int cap_mem_op_extension; @@ -359,7 +358,6 @@ int kvm_arch_init(MachineState *ms, KVMState *s) return -1; } =20 - cap_sync_regs =3D true; cap_async_pf =3D kvm_check_extension(s, KVM_CAP_ASYNC_PF); cap_mem_op =3D kvm_check_extension(s, KVM_CAP_S390_MEM_OP); cap_mem_op_extension =3D kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EX= TENSION); @@ -466,15 +464,16 @@ void kvm_s390_reset_vcpu_normal(S390CPU *cpu) =20 static int can_sync_regs(CPUState *cs, int regs) { - return cap_sync_regs && (cs->kvm_run->kvm_valid_regs & regs) =3D=3D re= gs; + return (cs->kvm_run->kvm_valid_regs & regs) =3D=3D regs; } =20 +#define KVM_SYNC_REQUIRED_BITS (KVM_SYNC_GPRS | KVM_SYNC_ACRS | \ + KVM_SYNC_CRS | KVM_SYNC_PREFIX) + int kvm_arch_put_registers(CPUState *cs, int level) { S390CPU *cpu =3D S390_CPU(cs); CPUS390XState *env =3D &cpu->env; - struct kvm_sregs sregs; - struct kvm_regs regs; struct kvm_fpu fpu =3D {}; int r; int i; @@ -483,20 +482,14 @@ int kvm_arch_put_registers(CPUState *cs, int level) cs->kvm_run->psw_addr =3D env->psw.addr; cs->kvm_run->psw_mask =3D env->psw.mask; =20 - if (can_sync_regs(cs, KVM_SYNC_GPRS)) { - for (i =3D 0; i < 16; i++) { - cs->kvm_run->s.regs.gprs[i] =3D env->regs[i]; - cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_GPRS; - } - } else { - for (i =3D 0; i < 16; i++) { - regs.gprs[i] =3D env->regs[i]; - } - r =3D kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s); - if (r < 0) { - return r; - } - } + g_assert((cs->kvm_run->kvm_valid_regs & KVM_SYNC_REQUIRED_BITS) =3D=3D + KVM_SYNC_REQUIRED_BITS); + cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_REQUIRED_BITS; + memcpy(cs->kvm_run->s.regs.gprs, env->regs, sizeof(cs->kvm_run->s.regs= .gprs)); + memcpy(cs->kvm_run->s.regs.acrs, env->aregs, sizeof(cs->kvm_run->s.reg= s.acrs)); + memcpy(cs->kvm_run->s.regs.crs, env->cregs, sizeof(cs->kvm_run->s.regs= .crs)); + + cs->kvm_run->s.regs.prefix =3D env->psa; =20 if (can_sync_regs(cs, KVM_SYNC_VRS)) { for (i =3D 0; i < 32; i++) { @@ -575,25 +568,6 @@ int kvm_arch_put_registers(CPUState *cs, int level) } } =20 - /* access registers and control registers*/ - if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) { - for (i =3D 0; i < 16; i++) { - cs->kvm_run->s.regs.acrs[i] =3D env->aregs[i]; - cs->kvm_run->s.regs.crs[i] =3D env->cregs[i]; - } - cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_ACRS; - cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_CRS; - } else { - for (i =3D 0; i < 16; i++) { - sregs.acrs[i] =3D env->aregs[i]; - sregs.crs[i] =3D env->cregs[i]; - } - r =3D 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 |=3D KVM_SYNC_GSCB; @@ -615,13 +589,6 @@ int kvm_arch_put_registers(CPUState *cs, int level) cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_DIAG318; } =20 - /* Finally the prefix */ - if (can_sync_regs(cs, KVM_SYNC_PREFIX)) { - cs->kvm_run->s.regs.prefix =3D env->psa; - cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_PREFIX; - } else { - /* prefix is only supported via sync regs */ - } return 0; } =20 @@ -629,8 +596,6 @@ int kvm_arch_get_registers(CPUState *cs) { S390CPU *cpu =3D S390_CPU(cs); CPUS390XState *env =3D &cpu->env; - struct kvm_sregs sregs; - struct kvm_regs regs; struct kvm_fpu fpu; int i, r; =20 @@ -638,37 +603,15 @@ int kvm_arch_get_registers(CPUState *cs) env->psw.addr =3D cs->kvm_run->psw_addr; env->psw.mask =3D cs->kvm_run->psw_mask; =20 - /* the GPRS */ - if (can_sync_regs(cs, KVM_SYNC_GPRS)) { - for (i =3D 0; i < 16; i++) { - env->regs[i] =3D cs->kvm_run->s.regs.gprs[i]; - } - } else { - r =3D kvm_vcpu_ioctl(cs, KVM_GET_REGS, ®s); - if (r < 0) { - return r; - } - for (i =3D 0; i < 16; i++) { - env->regs[i] =3D regs.gprs[i]; - } - } + /* the GPRS, ACRS and CRS */ + g_assert((cs->kvm_run->kvm_valid_regs & KVM_SYNC_REQUIRED_BITS) =3D=3D + KVM_SYNC_REQUIRED_BITS); + 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)); =20 - /* The ACRS and CRS */ - if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) { - for (i =3D 0; i < 16; i++) { - env->aregs[i] =3D cs->kvm_run->s.regs.acrs[i]; - env->cregs[i] =3D cs->kvm_run->s.regs.crs[i]; - } - } else { - r =3D kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs); - if (r < 0) { - return r; - } - for (i =3D 0; i < 16; i++) { - env->aregs[i] =3D sregs.acrs[i]; - env->cregs[i] =3D sregs.crs[i]; - } - } + /* The prefix */ + env->psa =3D cs->kvm_run->s.regs.prefix; =20 /* Floating point and vector registers */ if (can_sync_regs(cs, KVM_SYNC_VRS)) { @@ -693,11 +636,6 @@ int kvm_arch_get_registers(CPUState *cs) env->fpc =3D fpu.fpc; } =20 - /* The prefix */ - if (can_sync_regs(cs, KVM_SYNC_PREFIX)) { - env->psa =3D cs->kvm_run->s.regs.prefix; - } - if (can_sync_regs(cs, KVM_SYNC_ARCH0)) { env->cputm =3D cs->kvm_run->s.regs.cputm; env->ckc =3D cs->kvm_run->s.regs.ckc; --=20 2.41.0