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authorAnthony Liguori <aliguori@us.ibm.com>2007-04-30 09:48:11 +0300
committerAvi Kivity <avi@qumranet.com>2007-07-16 12:05:37 +0300
commitc86813393f8b8f9f738ab57d9837858ed850df4b (patch)
treebaaf7859daffb2d4c87749c09bed7dfcfe671468 /drivers/kvm
parentfdef3ad1b38660d74a29abc990940b5dbaaf3fc9 (diff)
KVM: SVM: Allow direct guest access to PC debug port
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>
Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/svm.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index fa17d6d4f0c..6cd6a50a034 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -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;