Commit 54810342 authored Feb 12, 2007 by Dor Laor Committed by Linus Torvalds Feb 12, 2007

[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>

parent d92899a0

drivers/kvm/kvm_main.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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_arch_ops->skip_emulated_instruction(vcpu);
		kvm_run->emulated = 0;

include/linux/kvm.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;