From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06F94C32750 for ; Fri, 2 Aug 2019 12:33:05 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id CD32D21841 for ; Fri, 2 Aug 2019 12:33:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD32D21841 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34484 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htWk4-0000xQ-4M for qemu-devel@archiver.kernel.org; Fri, 02 Aug 2019 08:33:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37881) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htWdr-0005fs-I5 for qemu-devel@nongnu.org; Fri, 02 Aug 2019 08:26:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1htWdq-00021b-5I for qemu-devel@nongnu.org; Fri, 02 Aug 2019 08:26:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55395) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1htWdl-0001xN-GO; Fri, 02 Aug 2019 08:26:33 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5323D3082E20; Fri, 2 Aug 2019 12:26:32 +0000 (UTC) Received: from kamzik.brq.redhat.com (unknown [10.43.2.160]) by smtp.corp.redhat.com (Postfix) with ESMTP id 55A8A5C205; Fri, 2 Aug 2019 12:26:29 +0000 (UTC) From: Andrew Jones To: qemu-devel@nongnu.org, qemu-arm@nongnu.org Date: Fri, 2 Aug 2019 14:25:36 +0200 Message-Id: <20190802122540.26385-12-drjones@redhat.com> In-Reply-To: <20190802122540.26385-1-drjones@redhat.com> References: <20190802122540.26385-1-drjones@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Fri, 02 Aug 2019 12:26:32 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 11/15] target/arm/kvm64: Add kvm_arch_get/put_sve 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: peter.maydell@linaro.org, richard.henderson@linaro.org, armbru@redhat.com, eric.auger@redhat.com, imammedo@redhat.com, alex.bennee@linaro.org, Dave.Martin@arm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" These are the SVE equivalents to kvm_arch_get/put_fpsimd. Note, the swabbing is different than it is for fpsmid because the vector format is a little-endian stream of words. Signed-off-by: Andrew Jones --- target/arm/kvm64.c | 150 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 146 insertions(+), 4 deletions(-) diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index 0b004d5d3050..f5c99984f25f 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -671,11 +671,12 @@ int kvm_arch_destroy_vcpu(CPUState *cs) bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx) { /* Return true if the regidx is a register we should synchronize - * via the cpreg_tuples array (ie is not a core reg we sync by - * hand in kvm_arch_get/put_registers()) + * via the cpreg_tuples array (ie is not a core or sve reg that + * we sync by hand in kvm_arch_get/put_registers()) */ switch (regidx & KVM_REG_ARM_COPROC_MASK) { case KVM_REG_ARM_CORE: + case KVM_REG_ARM64_SVE: return false; default: return true; @@ -761,6 +762,85 @@ static int kvm_arch_put_fpsimd(CPUState *cs) return 0; } =20 +/* + * SVE registers are encoded in KVM's memory in an endianness-invariant = format. + * The byte at offset i from the start of the in-memory representation c= ontains + * the bits [(7 + 8 * i) : (8 * i)] of the register value. As this means= the + * lowest offsets are stored in the lowest memory addresses, then that n= early + * matches QEMU's representation, which is to use an array of host-endia= n + * uint64_t's, where the lower offsets are at the lower indices. To comp= lete + * the translation we just need to byte swap the uint64_t's on big-endia= n hosts. + */ +#ifdef HOST_WORDS_BIGENDIAN +static uint64_t *sve_bswap64(uint64_t *dst, uint64_t *src, int nr) +{ + int i; + + for (i =3D 0; i < nr; ++i) { + dst[i] =3D bswap64(src[i]); + } + + return dst; +} +#endif + +/* + * KVM SVE registers come in slices where ZREGs have a slice size of 204= 8 bits + * and PREGS and the FFR have a slice size of 256 bits. However we simpl= y hard + * code the slice index to zero for now as it's unlikely we'll need more= than + * one slice for quite some time. + */ +static int kvm_arch_put_sve(CPUState *cs) +{ + ARMCPU *cpu =3D ARM_CPU(cs); + CPUARMState *env =3D &cpu->env; +#ifdef HOST_WORDS_BIGENDIAN + uint64_t tmp[ARM_MAX_VQ * 2]; +#endif + uint64_t *r; + struct kvm_one_reg reg; + int n, ret; + + for (n =3D 0; n < KVM_ARM64_SVE_NUM_ZREGS; ++n) { + r =3D &env->vfp.zregs[n].d[0]; +#ifdef HOST_WORDS_BIGENDIAN + r =3D sve_bswap64(tmp, r, cpu->sve_max_vq * 2); +#endif + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_ZREG(n, 0); + ret =3D kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); + if (ret) { + return ret; + } + } + + for (n =3D 0; n < KVM_ARM64_SVE_NUM_PREGS; ++n) { + r =3D &env->vfp.pregs[n].p[0]; +#ifdef HOST_WORDS_BIGENDIAN + r =3D sve_bswap64(tmp, r, DIV_ROUND_UP(cpu->sve_max_vq, 8)); +#endif + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_PREG(n, 0); + ret =3D kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); + if (ret) { + return ret; + } + } + + r =3D &env->vfp.pregs[FFR_PRED_NUM].p[0]; +#ifdef HOST_WORDS_BIGENDIAN + r =3D sve_bswap64(tmp, r, DIV_ROUND_UP(cpu->sve_max_vq, 8)); +#endif + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_FFR(0); + ret =3D kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); + if (ret) { + return ret; + } + + return 0; +} + int kvm_arch_put_registers(CPUState *cs, int level) { struct kvm_one_reg reg; @@ -855,7 +935,11 @@ int kvm_arch_put_registers(CPUState *cs, int level) } } =20 - ret =3D kvm_arch_put_fpsimd(cs); + if (cpu_isar_feature(aa64_sve, cpu)) { + ret =3D kvm_arch_put_sve(cs); + } else { + ret =3D kvm_arch_put_fpsimd(cs); + } if (ret) { return ret; } @@ -918,6 +1002,60 @@ static int kvm_arch_get_fpsimd(CPUState *cs) return 0; } =20 +/* + * KVM SVE registers come in slices where ZREGs have a slice size of 204= 8 bits + * and PREGS and the FFR have a slice size of 256 bits. However we simpl= y hard + * code the slice index to zero for now as it's unlikely we'll need more= than + * one slice for quite some time. + */ +static int kvm_arch_get_sve(CPUState *cs) +{ + ARMCPU *cpu =3D ARM_CPU(cs); + CPUARMState *env =3D &cpu->env; + struct kvm_one_reg reg; + uint64_t *r; + int n, ret; + + for (n =3D 0; n < KVM_ARM64_SVE_NUM_ZREGS; ++n) { + r =3D &env->vfp.zregs[n].d[0]; + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_ZREG(n, 0); + ret =3D kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + if (ret) { + return ret; + } +#ifdef HOST_WORDS_BIGENDIAN + sve_bswap64(r, r, cpu->sve_max_vq * 2); +#endif + } + + for (n =3D 0; n < KVM_ARM64_SVE_NUM_PREGS; ++n) { + r =3D &env->vfp.pregs[n].p[0]; + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_PREG(n, 0); + ret =3D kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + if (ret) { + return ret; + } +#ifdef HOST_WORDS_BIGENDIAN + sve_bswap64(r, r, DIV_ROUND_UP(cpu->sve_max_vq, 8)); +#endif + } + + r =3D &env->vfp.pregs[FFR_PRED_NUM].p[0]; + reg.addr =3D (uintptr_t)r; + reg.id =3D KVM_REG_ARM64_SVE_FFR(0); + ret =3D kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + if (ret) { + return ret; + } +#ifdef HOST_WORDS_BIGENDIAN + sve_bswap64(r, r, DIV_ROUND_UP(cpu->sve_max_vq, 8)); +#endif + + return 0; +} + int kvm_arch_get_registers(CPUState *cs) { struct kvm_one_reg reg; @@ -1012,7 +1150,11 @@ int kvm_arch_get_registers(CPUState *cs) env->spsr =3D env->banked_spsr[i]; } =20 - ret =3D kvm_arch_get_fpsimd(cs); + if (cpu_isar_feature(aa64_sve, cpu)) { + ret =3D kvm_arch_get_sve(cs); + } else { + ret =3D kvm_arch_get_fpsimd(cs); + } if (ret) { return ret; } --=20 2.20.1