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>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 9184e32778ab08f89e3fcad0e062b739c09ddddb..1f8510c51d6e8abc2f315d9724e34708f49e2a6b 100644 (file)
--- 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))