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| author | Rob Herring <robh@kernel.org> | 2020-08-03 13:31:25 -0600 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-08-21 12:23:09 +0100 |
| commit | abf532cceaca9c21a148498091f87de1b8ae9b49 (patch) | |
| tree | 89894ac4d465131500f11604ef39ffe66630a5f2 /arch/arm64/kvm | |
| parent | bf87bb0881d0f59181fe3bbcf29c609f36483ff8 (diff) | |
| download | linux-abf532cceaca9c21a148498091f87de1b8ae9b49.tar.bz2 | |
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>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/arm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 691d21e4c717..46dc3d75cf13 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -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) { |