Commit 54810342 authored by Dor Laor's avatar Dor Laor Committed by Linus Torvalds
Browse files

[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

Thanks for Yaniv Kamay for the idea.
Signed-off-by: default avatarDor Laor <>
Signed-off-by: default avatarAvi Kivity <>
Cc: Ingo Molnar <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent d92899a0
......@@ -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;
......@@ -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;
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment