Commit abf532cc authored Aug 03, 2020 by Rob Herring Committed by Catalin Marinas Aug 21, 2020

KVM: arm64: Print warning when cpu erratum can cause guests to deadlock



If guests don't have certain CPU erratum workarounds implemented, then
there is a possibility a guest can deadlock the system. IOW, only trusted
guests should be used on systems with the erratum.

This is the case for Cortex-A57 erratum 832075.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: kvmarm@lists.cs.columbia.edu
Link: https://lore.kernel.org/r/20200803193127.3012242-2-robh@kernel.org


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent bf87bb08

arch/arm64/kvm/arm.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1640,6 +1640,10 @@ int kvm_arch_init(void *opaque)
		return -ENODEV;
		}

		if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE))
		kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
		"Only trusted guests should be used on this system.\n");

		for_each_online_cpu(cpu) {
		smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
		if (ret < 0) {

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