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| author | Avi Kivity <avi@redhat.com> | 2009-05-11 13:21:10 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-05-11 13:40:51 +0200 |
| commit | 99f85a28a78e96d28907fe036e1671a218fee597 (patch) | |
| tree | 7d24df5b4d27d6801b1c372297adffb2334d9a97 /arch/x86 | |
| parent | KVM: Make EFER reads safe when EFER does not exist (diff) | |
| download | linux-99f85a28a78e96d28907fe036e1671a218fee597.tar.xz linux-99f85a28a78e96d28907fe036e1671a218fee597.zip | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/svm.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 9184e32778ab..1f8510c51d6e 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -411,7 +411,6 @@ static __init int svm_hardware_setup(void) 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)) |