From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-91.mta1.migadu.com (out-91.mta1.migadu.com [95.215.58.91]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8680917FE8 for ; Wed, 2 Aug 2023 23:43:48 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1691019826; 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=cREQk3lPQed1rMczUzUwsTHm7EyXdZMjQSaPpcSEwFM=; b=udVVg4uSUi9YRbFpz9du5+IMOtsY8bkfGYbg6AQ+jDRo8GcQGcIOUtvihb4jO6Xa2yqiFB rtDuzBG767YnjpdK4l+5x0udjXF4dhnw7HoNICJZG9d5YJH7ROr8ur0PJWz9edjdfP5QsW l17z4wmv7sDPfjld1a2GaA22l8i1JFw= From: Oliver Upton To: kvmarm@lists.linux.dev Cc: kvm@vger.kernel.org, Marc Zyngier , James Morse , Suzuki K Poulose , Zenghui Yu , Will Deacon , Julien Thierry , Salil Mehta , Oliver Upton Subject: [PATCH kvmtool v3 17/17] aarch64: smccc: Start sending PSCI to userspace Date: Wed, 2 Aug 2023 23:42:55 +0000 Message-ID: <20230802234255.466782-18-oliver.upton@linux.dev> In-Reply-To: <20230802234255.466782-1-oliver.upton@linux.dev> References: <20230802234255.466782-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT kvmtool now has a PSCI implementation that complies with v1.0 of the specification. Use the SMCCC filter to start sending these calls out to userspace for further handling. While at it, shut the door on the legacy, KVM-specific v0.1 functions. Signed-off-by: Oliver Upton --- arm/aarch64/include/kvm/kvm-config-arch.h | 6 +++- arm/aarch64/smccc.c | 37 +++++++++++++++++++++++ arm/include/arm-common/kvm-config-arch.h | 1 + 3 files changed, 43 insertions(+), 1 deletion(-) diff --git a/arm/aarch64/include/kvm/kvm-config-arch.h b/arm/aarch64/include/kvm/kvm-config-arch.h index eae8080d3fd9..1c40bbac70f5 100644 --- a/arm/aarch64/include/kvm/kvm-config-arch.h +++ b/arm/aarch64/include/kvm/kvm-config-arch.h @@ -19,7 +19,11 @@ int vcpu_affinity_parser(const struct option *opt, const char *arg, int unset); "Specify random seed for Kernel Address Space " \ "Layout Randomization (KASLR)"), \ OPT_BOOLEAN('\0', "no-pvtime", &(cfg)->no_pvtime, "Disable" \ - " stolen time"), + " stolen time"), \ + OPT_BOOLEAN('\0', "in-kernel-smccc", &(cfg)->in_kernel_smccc, \ + "Disable userspace handling of SMCCC, instead" \ + " relying on the in-kernel implementation"), + #include "arm-common/kvm-config-arch.h" #endif /* KVM__KVM_CONFIG_ARCH_H */ diff --git a/arm/aarch64/smccc.c b/arm/aarch64/smccc.c index ef986d8c526f..62d826befa50 100644 --- a/arm/aarch64/smccc.c +++ b/arm/aarch64/smccc.c @@ -38,7 +38,44 @@ out: return true; } +static struct kvm_smccc_filter filter_ranges[] = { + { + .base = KVM_PSCI_FN_BASE, + .nr_functions = 4, + .action = KVM_SMCCC_FILTER_DENY, + }, + { + .base = PSCI_0_2_FN_BASE, + .nr_functions = 0x20, + .action = KVM_SMCCC_FILTER_FWD_TO_USER, + }, + { + .base = PSCI_0_2_FN64_BASE, + .nr_functions = 0x20, + .action = KVM_SMCCC_FILTER_FWD_TO_USER, + }, +}; + void kvm__setup_smccc(struct kvm *kvm) { + struct kvm_device_attr attr = { + .group = KVM_ARM_VM_SMCCC_CTRL, + .attr = KVM_ARM_VM_SMCCC_FILTER, + }; + unsigned int i; + if (kvm->cfg.arch.in_kernel_smccc) + return; + + if (ioctl(kvm->vm_fd, KVM_HAS_DEVICE_ATTR, &attr)) { + pr_debug("KVM SMCCC filter not supported"); + return; + } + + for (i = 0; i < ARRAY_SIZE(filter_ranges); i++) { + attr.addr = (u64)&filter_ranges[i]; + + if (ioctl(kvm->vm_fd, KVM_SET_DEVICE_ATTR, &attr)) + die_perror("KVM_SET_DEVICE_ATTR failed"); + } } diff --git a/arm/include/arm-common/kvm-config-arch.h b/arm/include/arm-common/kvm-config-arch.h index 23a74867a474..223b5a933542 100644 --- a/arm/include/arm-common/kvm-config-arch.h +++ b/arm/include/arm-common/kvm-config-arch.h @@ -14,6 +14,7 @@ struct kvm_config_arch { enum irqchip_type irqchip; u64 fw_addr; bool no_pvtime; + bool in_kernel_smccc; }; int irqchip_parser(const struct option *opt, const char *arg, int unset); -- 2.41.0.585.gd2178a4bd4-goog