KVM: emulate lapic tsc deadline timer for guest

This patch emulate lapic tsc deadline timer for guest:
Enumerate tsc deadline timer capability by CPUID;
Enable tsc deadline timer mode by lapic MMIO;
Start tsc deadline timer by WRMSR;

[jan: use do_div()]
[avi: fix for !irqchip_in_kernel()]
[marcelo: another fix for !irqchip_in_kernel()]

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kvm/kvm_timer.h b/arch/x86/kvm/kvm_timer.h
index 64bc6ea78d90..497dbaa366d4 100644
--- a/arch/x86/kvm/kvm_timer.h
+++ b/arch/x86/kvm/kvm_timer.h
@@ -2,6 +2,8 @@
 struct kvm_timer {
         struct hrtimer timer;
         s64 period;                             /* unit: ns */
+        u32 timer_mode_mask;
+        u64 tscdeadline;
         atomic_t pending;                       /* accumulated triggered timers */
         bool reinject;
         struct kvm_timer_ops *t_ops;