Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c86813393f8b8f9f738ab57d9837858ed850df4b
Commit:     c86813393f8b8f9f738ab57d9837858ed850df4b
Parent:     fdef3ad1b38660d74a29abc990940b5dbaaf3fc9
Author:     Anthony Liguori <[EMAIL PROTECTED]>
AuthorDate: Mon Apr 30 09:48:11 2007 +0300
Committer:  Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 12:05:37 2007 +0300

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 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 fa17d6d..6cd6a50 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;
 
 
-
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