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KVM: SVM: Allow direct guest access to PC debug port

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The PC debug port is used for IO delay and does not require emulation.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Anthony Liguori 2007-04-30 09:48:11 +03:00 committed by Avi Kivity
parent fdef3ad1b3
commit c86813393f
1 changed files with 5 additions and 3 deletions
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8
drivers/kvm/svm.c
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@ -378,7 +378,7 @@ static __init int svm_hardware_setup(void)
int cpu;
struct page *iopm_pages;
struct page *msrpm_pages;
void *msrpm_va;
void *iopm_va, *msrpm_va;
int r;
kvm_emulator_want_group7_invlpg();
@ -387,8 +387,10 @@ static __init int svm_hardware_setup(void)
if (!iopm_pages)
return -ENOMEM;
memset(page_address(iopm_pages), 0xff,
PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
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;