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Tue, 02 Dec 2025 08:08:59 -0800 (PST) From: Sebastian Ott To: Peter Maydell , Paolo Bonzini , Eric Auger Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, Sebastian Ott Subject: [PATCH v4 1/2] target/arm/kvm: add constants for new PSCI versions Date: Tue, 2 Dec 2025 17:08:52 +0100 Message-ID: <20251202160853.22560-2-sebott@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251202160853.22560-1-sebott@redhat.com> References: <20251202160853.22560-1-sebott@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=sebott@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_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: 1764692915078019200 Content-Type: text/plain; charset="utf-8" Add constants for PSCI version 1_2 and 1_3. Signed-off-by: Sebastian Ott Reviewed-by: Eric Auger Reviewed-by: Stefan Weil Tested-by: Eric Auger --- target/arm/kvm-consts.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/arm/kvm-consts.h b/target/arm/kvm-consts.h index 54ae5da7ce..9fba3e886d 100644 --- a/target/arm/kvm-consts.h +++ b/target/arm/kvm-consts.h @@ -97,6 +97,8 @@ MISMATCH_CHECK(QEMU_PSCI_1_0_FN_PSCI_FEATURES, PSCI_1_0_F= N_PSCI_FEATURES); #define QEMU_PSCI_VERSION_0_2 0x00002 #define QEMU_PSCI_VERSION_1_0 0x10000 #define QEMU_PSCI_VERSION_1_1 0x10001 +#define QEMU_PSCI_VERSION_1_2 0x10002 +#define QEMU_PSCI_VERSION_1_3 0x10003 =20 MISMATCH_CHECK(QEMU_PSCI_0_2_RET_TOS_MIGRATION_NOT_REQUIRED, PSCI_0_2_TOS_= MP); /* We don't bother to check every possible version value */ --=20 2.42.0 From nobody Sun Feb 8 20:20:24 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=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1764692918; cv=none; d=zohomail.com; s=zohoarc; b=CBxf8r/FYDh5QcrtyGdKsZDPdexVPtDnpEnPbZVfBe03nRrfSGm+5Xe2zHUSWzLajgnGtk+DDtmQO5LtyrCciAcILNkQEwmw0XOXhITZIN6mIqLaA/eEYaWFXVK0o8657GseRM1DIkloUloAmlS1AZxK9LCGBnwrain3O3dAXJM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1764692918; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=1r6iwMV7OOxfpGBTEnAoro8MxvDg/dbyx+KBPvZFR2o=; b=fORViKOpKPC8wPmBebkOH4B4kzu5VpTNnzkhAd4KLE9jz81HFWzORqbeB6gstHHZLQGIhAH3Kzq6aPRMf6Fe/Qj9qELbfk7KKK6ZcfshzmE+iPmw3taEYKDsS2d4Fmv3aALJtKHMim3rz1F95UJtvH/fh5tNxhVdlX6kA3Jq4K4= ARC-Authentication-Results: i=1; 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 header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1764692918469695.1606891812564; Tue, 2 Dec 2025 08:28:38 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vQSyJ-0007sb-Ua; Tue, 02 Dec 2025 11:11:23 -0500 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 1vQSw7-0004xE-Tp for qemu-devel@nongnu.org; Tue, 02 Dec 2025 11:09:09 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vQSw5-00006t-5c for qemu-devel@nongnu.org; Tue, 02 Dec 2025 11:09:07 -0500 Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-472-g2VbC5d6OSq7BJZfF8iWSQ-1; Tue, 02 Dec 2025 11:09:02 -0500 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-42e2d105358so1898329f8f.3 for ; Tue, 02 Dec 2025 08:09:01 -0800 (PST) Received: from rh.redhat.com (p200300f6af35a800883b071bf1f3e4b6.dip0.t-ipconnect.de. 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Tue, 02 Dec 2025 08:09:00 -0800 (PST) From: Sebastian Ott To: Peter Maydell , Paolo Bonzini , Eric Auger Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, Sebastian Ott Subject: [PATCH v4 2/2] target/arm/kvm: add kvm-psci-version vcpu property Date: Tue, 2 Dec 2025 17:08:53 +0100 Message-ID: <20251202160853.22560-3-sebott@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251202160853.22560-1-sebott@redhat.com> References: <20251202160853.22560-1-sebott@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=170.10.133.124; envelope-from=sebott@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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: 1764692920150019200 Content-Type: text/plain; charset="utf-8" Provide a kvm specific vcpu property to override the default (as of kernel v6.13 that would be PSCI v1.3) PSCI version emulated by kvm. Current valid values are: 0.1, 0.2, 1.0, 1.1, 1.2, and 1.3 Note: in order to support PSCI v0.1 we need to drop vcpu initialization with KVM_CAP_ARM_PSCI_0_2 in that case. Signed-off-by: Sebastian Ott Reviewed-by: Eric Auger Tested-by: Eric Auger --- docs/system/arm/cpu-features.rst | 5 +++ target/arm/cpu.h | 6 +++ target/arm/kvm.c | 64 +++++++++++++++++++++++++++++++- 3 files changed, 74 insertions(+), 1 deletion(-) diff --git a/docs/system/arm/cpu-features.rst b/docs/system/arm/cpu-feature= s.rst index 37d5dfd15b..1d32ce0fee 100644 --- a/docs/system/arm/cpu-features.rst +++ b/docs/system/arm/cpu-features.rst @@ -204,6 +204,11 @@ the list of KVM VCPU features and their descriptions. the guest scheduler behavior and/or be exposed to the guest userspace. =20 +``kvm-psci-version`` + Override the default (as of kernel v6.13 that would be PSCI v1.3) + PSCI version emulated by the kernel. Current valid values are: + 0.1, 0.2, 1.0, 1.1, 1.2, and 1.3 + TCG VCPU Features =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 39f2b2e54d..e2b6b587ea 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -1035,6 +1035,12 @@ struct ArchCPU { bool kvm_vtime_dirty; uint64_t kvm_vtime; =20 + /* + * Intermediate value used during property parsing. + * Once finalized, the value should be read from psci_version. + */ + uint32_t kvm_prop_psci_version; + /* KVM steal time */ OnOffAuto kvm_steal_time; =20 diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 0d57081e69..cf2de87287 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -484,6 +484,49 @@ static void kvm_steal_time_set(Object *obj, bool value= , Error **errp) ARM_CPU(obj)->kvm_steal_time =3D value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_= OFF; } =20 +struct psci_version { + uint32_t number; + const char *str; +}; + +static const struct psci_version psci_versions[] =3D { + { QEMU_PSCI_VERSION_0_1, "0.1" }, + { QEMU_PSCI_VERSION_0_2, "0.2" }, + { QEMU_PSCI_VERSION_1_0, "1.0" }, + { QEMU_PSCI_VERSION_1_1, "1.1" }, + { QEMU_PSCI_VERSION_1_2, "1.2" }, + { QEMU_PSCI_VERSION_1_3, "1.3" }, + { -1, NULL }, +}; + +static char *kvm_get_psci_version(Object *obj, Error **errp) +{ + ARMCPU *cpu =3D ARM_CPU(obj); + const struct psci_version *ver; + + for (ver =3D psci_versions; ver->number !=3D -1; ver++) { + if (ver->number =3D=3D cpu->psci_version) + return g_strdup(ver->str); + } + + return g_strdup_printf("Unknown PSCI-version: %x", cpu->psci_version); +} + +static void kvm_set_psci_version(Object *obj, const char *value, Error **e= rrp) +{ + ARMCPU *cpu =3D ARM_CPU(obj); + const struct psci_version *ver; + + for (ver =3D psci_versions; ver->number !=3D -1; ver++) { + if (!strcmp(value, ver->str)) { + cpu->kvm_prop_psci_version =3D ver->number; + return; + } + } + + error_setg(errp, "Invalid PSCI-version value"); +} + /* KVM VCPU properties should be prefixed with "kvm-". */ void kvm_arm_add_vcpu_properties(ARMCPU *cpu) { @@ -505,6 +548,12 @@ void kvm_arm_add_vcpu_properties(ARMCPU *cpu) kvm_steal_time_set); object_property_set_description(obj, "kvm-steal-time", "Set off to disable KVM steal time."); + + object_property_add_str(obj, "kvm-psci-version", kvm_get_psci_version, + kvm_set_psci_version); + object_property_set_description(obj, "kvm-psci-version", + "Set PSCI version. " + "Valid values are 0.1, 0.2, 1.0, 1.1, = 1.2, 1.3"); } =20 bool kvm_arm_pmu_supported(void) @@ -1959,7 +2008,12 @@ int kvm_arch_init_vcpu(CPUState *cs) if (cs->start_powered_off) { cpu->kvm_init_features[0] |=3D 1 << KVM_ARM_VCPU_POWER_OFF; } - if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) { + if (cpu->kvm_prop_psci_version !=3D QEMU_PSCI_VERSION_0_1 && + kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) { + /* + * Versions >=3D v0.2 are backward compatible with v0.2 + * omit the feature flag for v0.1 . + */ cpu->psci_version =3D QEMU_PSCI_VERSION_0_2; cpu->kvm_init_features[0] |=3D 1 << KVM_ARM_VCPU_PSCI_0_2; } @@ -1998,6 +2052,14 @@ int kvm_arch_init_vcpu(CPUState *cs) } } =20 + if (cpu->kvm_prop_psci_version) { + psciver =3D cpu->kvm_prop_psci_version; + ret =3D kvm_set_one_reg(cs, KVM_REG_ARM_PSCI_VERSION, &psciver); + if (ret) { + error_report("PSCI version %"PRIx64" is not supported by KVM",= psciver); + return ret; + } + } /* * KVM reports the exact PSCI version it is implementing via a * special sysreg. If it is present, use its contents to determine --=20 2.42.0