diff options
authorDor Laor <dor.laor@qumranet.com>2007-02-12 00:54:39 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-12 09:48:40 -0800
commit54810342f1372afdaf6cb9a6aea0c35df187db12 (patch)
parentd92899a0014aa795c21d3cf726ef5ff7684399f4 (diff)
[PATCH] kvm: Two-way apic tpr synchronization
We report the value of cr8 to userspace on an exit. Also let userspace change cr8 when we re-enter the guest. The lets 64-bit guest code maintain the tpr correctly. Thanks for Yaniv Kamay for the idea. Signed-off-by: Dor Laor <dor.laor@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 099f0afd394d..eb3931ca680a 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1360,6 +1360,9 @@ static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
if (!vcpu)
return -ENOENT;
+ /* re-sync apic's tpr */
+ vcpu->cr8 = kvm_run->cr8;
if (kvm_run->emulated) {
kvm_run->emulated = 0;
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 1be148f0fce4..6a5f6f49e037 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -65,6 +65,8 @@ struct kvm_run {
__u8 ready_for_interrupt_injection;
__u8 if_flag;
__u16 padding2;
+ /* in (pre_kvm_run), out (post_kvm_run) */
__u64 cr8;
__u64 apic_base;

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