From: Avi Kivity Date: Mon, 11 May 2009 11:21:10 +0000 (+0300) Subject: KVM: SVM: Remove port 80 passthrough X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=99f85a28a78e96d28907fe036e1671a218fee597;p=linux-beck.git 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 Tested-by: Piotr Jaroszyński Signed-off-by: Avi Kivity --- 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))