KVM: paravirtualized clocksource: host part

This is the host part of kvm clocksource implementation. As it does
not include clockevents, it is a fairly simple implementation. We
only have to register a per-vcpu area, and start writing to it periodically.

The area is binary compatible with xen, as we use the same shadow_info
structure.

[marcelo: fix bad_page on MSR_KVM_SYSTEM_TIME]
[avi: save full value of the msr, even if enable bit is clear]
[avi: clear previous value of time_page]

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 623249890a0b..90c80fd830fc 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -262,6 +262,11 @@ struct kvm_vcpu_arch {
         /* emulate context */
 
         struct x86_emulate_ctxt emulate_ctxt;
+
+        gpa_t time;
+        struct kvm_vcpu_time_info hv_clock;
+        unsigned int time_offset;
+        struct page *time_page;
 };
 
 struct kvm_mem_alias {
@@ -288,6 +293,8 @@ struct kvm_arch{
         int round_robin_prev_vcpu;
         unsigned int tss_addr;
         struct page *apic_access_page;
+
+        gpa_t wall_clock;
 };
 
 struct kvm_vm_stat {