From d3ab1d014d9911ba457d979dbf64322f4056e43d Mon Sep 17 00:00:00 2001 From: Sheng Yang Date: Wed, 15 Aug 2007 16:22:55 +0800 Subject: [PATCH] Fix CR8 support in kvm This patch fixs CR8 support for x64 Windows. Now when writing to CR8 in the guest OS, we exit to userspace and update tpr in qemu apic emulation. We can boot x64 Windows XP with this patch now. Signed-off-by: Sheng Yang --- drivers/kvm/vmx.c | 3 ++- include/linux/kvm.h | 1 + 2 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 906d4fa..8f9a0bb 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1831,7 +1831,8 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) vcpu_load_rsp_rip(vcpu); set_cr8(vcpu, vcpu->regs[reg]); skip_emulated_instruction(vcpu); - return 1; + kvm_run->exit_reason = KVM_EXIT_SET_TPR; + return 0; }; break; case 2: /* clts */ diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 91a446f..1d5a49c 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -46,6 +46,7 @@ enum kvm_exit_reason { KVM_EXIT_SHUTDOWN = 8, KVM_EXIT_FAIL_ENTRY = 9, KVM_EXIT_INTR = 10, + KVM_EXIT_SET_TPR = 11 }; /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */ -- 1.5.2