Messages in this thread Patch in this message | | | From | Sean Christopherson <> | Subject | [PATCH 2/4] KVM: x86: Ensure all logical CPUs have consistent reserved cr4 bits | Date | Tue, 10 Dec 2019 14:44:14 -0800 |
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Check the current CPU's reserved cr4 bits against the mask calculated for the boot CPU to ensure consistent behavior across all CPUs.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> ---
I'm on the fence as to whether this is gratuitous or useful, which is why it's a separate patch and not tagged for stable.
arch/x86/kvm/x86.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 321eecb4cffd..ab3a4104febf 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9415,6 +9415,13 @@ void kvm_arch_hardware_unsetup(void) int kvm_arch_check_processor_compat(void) { + struct cpuinfo_x86 *c = &cpu_data(smp_processor_id()); + + WARN_ON(!irqs_disabled()); + + if (kvm_host_cr4_reserved_bits(c) != cr4_reserved_bits) + return -EIO; + return kvm_x86_ops->check_processor_compatibility(); } -- 2.24.0
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