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File _service:tar_scm:arm-kvm-Set-psci-smccc-filter-only-with-vcpu-hotplug.patch of Package qemu
From 85e8e1ee8560e587845142342f81b218e44cba6a Mon Sep 17 00:00:00 2001 From: Keqian Zhu <zhukeqian1@huawei.com> Date: Tue, 26 Mar 2024 22:07:33 +0800 Subject: [PATCH] arm/kvm: Set psci smccc filter only with vcpu hotplug The smccc filter mechanism is supported by newer Linux kernel, don't try to do it unconditionaly. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> --- hw/arm/virt.c | 4 +++- target/arm/kvm.c | 21 ++++++++++++--------- 2 files changed, 15 insertions(+), 10 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index e60f3431f9..38b5d214a1 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -2366,8 +2366,10 @@ static void machvirt_init(MachineState *machine) finalize_gic_version(vms); if (tcg_enabled() || hvf_enabled() || qtest_enabled() || (vms->gic_version < VIRT_GIC_VERSION_3)) { - machine->smp.max_cpus = smp_cpus; mc->has_hotpluggable_cpus = false; + } + if (!mc->has_hotpluggable_cpus) { + machine->smp.max_cpus = smp_cpus; warn_report("cpu hotplug feature has been disabled"); } diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 66caf9e5e7..19783d567f 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -259,6 +259,7 @@ int kvm_arch_get_default_type(MachineState *ms) int kvm_arch_init(MachineState *ms, KVMState *s) { + MachineClass *mc = MACHINE_GET_CLASS(ms); int ret = 0; /* For ARM interrupt delivery is always asynchronous, @@ -316,15 +317,17 @@ int kvm_arch_init(MachineState *ms, KVMState *s) * filter in the Host KVM. This is required to support features like * virtual CPU Hotplug on ARM platforms. */ - if (kvm_arm_set_smccc_filter(PSCI_0_2_FN64_CPU_ON, - KVM_SMCCC_FILTER_FWD_TO_USER)) { - error_report("CPU On PSCI-to-user-space fwd filter install failed"); - abort(); - } - if (kvm_arm_set_smccc_filter(PSCI_0_2_FN_CPU_OFF, - KVM_SMCCC_FILTER_FWD_TO_USER)) { - error_report("CPU Off PSCI-to-user-space fwd filter install failed"); - abort(); + if (mc->has_hotpluggable_cpus && ms->smp.max_cpus > ms->smp.cpus) { + if (kvm_arm_set_smccc_filter(PSCI_0_2_FN64_CPU_ON, + KVM_SMCCC_FILTER_FWD_TO_USER)) { + error_report("CPU On PSCI-to-user-space fwd filter install failed"); + mc->has_hotpluggable_cpus = false; + } + if (kvm_arm_set_smccc_filter(PSCI_0_2_FN_CPU_OFF, + KVM_SMCCC_FILTER_FWD_TO_USER)) { + error_report("CPU Off PSCI-to-user-space fwd filter install failed"); + mc->has_hotpluggable_cpus = false; + } } kvm_arm_init_debug(s); -- 2.27.0
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