Messages in this thread Patch in this message | | | Date | Thu, 14 May 2009 15:33:18 -0700 | From | Greg KH <> | Subject | [patch 43/51] KVM: SVM: Remove port 80 passthrough |
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2.6.29-stable review patch. If anyone has any objections, please let us know.
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From: Avi Kivity <avi@redhat.com>
commit 99f85a28a78e96d28907fe036e1671a218fee597 upstream.
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.
Reported-by: Piotr JaroszyÅski <p.jaroszynski@gmail.com> Tested-by: Piotr JaroszyÅski <p.jaroszynski@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/x86/kvm/svm.c | 1 - 1 file changed, 1 deletion(-)
--- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -411,7 +411,6 @@ static __init int svm_hardware_setup(voi iopm_va = page_address(iopm_pages); memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER)); - clear_bit(0x80, iopm_va); /* allow direct access to PC debug port */ iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT; if (boot_cpu_has(X86_FEATURE_NX))
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