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| author | Anthony Liguori <aliguori@us.ibm.com> | 2007-04-30 09:48:11 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 12:05:37 +0300 |
| commit | c86813393f8b8f9f738ab57d9837858ed850df4b (patch) | |
| tree | baaf7859daffb2d4c87749c09bed7dfcfe671468 | |
| parent | fdef3ad1b38660d74a29abc990940b5dbaaf3fc9 (diff) | |
| download | blackbird-op-linux-c86813393f8b8f9f738ab57d9837858ed850df4b.tar.gz blackbird-op-linux-c86813393f8b8f9f738ab57d9837858ed850df4b.zip | |
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>
| -rw-r--r-- | drivers/kvm/svm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index fa17d6d4f0cb..6cd6a50a0340 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; |
