65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
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From e3a7ec839fa4f823666d726989c375dcf73348a4 Mon Sep 17 00:00:00 2001
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From: Ying Fang <fangying1@huawei.com>
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Date: Wed, 15 Apr 2020 16:14:50 +0800
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Subject: [PATCH] ARM: KVM: Check KVM_CAP_ARM_IRQ_LINE_LAYOUT_2 for smp_cpus >
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256
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Host kernel within [4.18, 5.3] report an erroneous KVM_MAX_VCPUS=512
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for ARM. The actual capability to instantiate more than 256 vcpus
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was fixed in 5.4 with the upgrade of the KVM_IRQ_LINE ABI to support
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vcpu id encoded on 12 bits instead of 8 and a redistributor consuming
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a single KVM IO device instead of 2.
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So let's check this capability when attempting to use more than 256
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vcpus within any ARM kvm accelerated machine.
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Signed-off-by: Eric Auger <eric.auger@redhat.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Reviewed-by: Andrew Jones <drjones@redhat.com>
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Acked-by: Marc Zyngier <maz@kernel.org>
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Message-id: 20191003154640.22451-4-eric.auger@redhat.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry-picked from commit fff9f5558d0e0813d4f80bfe1602acf225eca4fd)
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[yu: Use the legacy smp_cpus instead of ms->smp.cpus, as we don't have
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¦struct CpuTopology in MachineState at that time. See commit
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¦edeeec911702 for details.]
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Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
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---
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target/arm/kvm.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/target/arm/kvm.c b/target/arm/kvm.c
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index 50e86f8b..cc7a46df 100644
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--- a/target/arm/kvm.c
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+++ b/target/arm/kvm.c
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@@ -173,6 +173,8 @@ int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
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int kvm_arch_init(MachineState *ms, KVMState *s)
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{
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+ int ret = 0;
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+ unsigned int smp_cpus = ms->smp.cpus;
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/* For ARM interrupt delivery is always asynchronous,
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* whether we are using an in-kernel VGIC or not.
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*/
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@@ -186,7 +188,14 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
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- return 0;
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+ if (smp_cpus > 256 &&
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+ !kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
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+ error_report("Using more than 256 vcpus requires a host kernel "
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+ "with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
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+ ret = -EINVAL;
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+ }
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+
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+ return ret;
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}
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unsigned long kvm_arch_vcpu_id(CPUState *cpu)
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--
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2.23.0
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