KVM: SVM: Remove port 80 passthrough
KVM optimizes guest port 80 accesses by passthing them through to the host. Some AMD machines die on port 80 writes, allowing the guest to hard-lock the host. Remove the port passthrough to avoid the problem. Cc: stable@kernel.org Reported-by: Piotr Jaroszyński <p.jaroszynski@gmail.com> Tested-by: Piotr Jaroszyński <p.jaroszynski@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -411,7 +411,6 @@ static __init int svm_hardware_setup(void)
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iopm_va = page_address(iopm_pages);
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memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
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clear_bit(0x80, iopm_va); /* allow direct access to PC debug port */
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iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
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if (boot_cpu_has(X86_FEATURE_NX))
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