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KVM: paravirtualized clocksource: host part

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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>
This commit is contained in:
Glauber de Oliveira Costa 2008-02-15 17:52:47 -02:00 • committed by Avi Kivity
commit 18068523d3
4 changed files with 145 additions and 1 deletions
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7
include/asm-x86/kvm_host.h
View file

@ -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 {

25
include/asm-x86/kvm_para.h
View file

@ -10,10 +10,35 @@
* paravirtualization, the appropriate feature bit should be checked.
*/
#define KVM_CPUID_FEATURES 0x40000001
#define KVM_FEATURE_CLOCKSOURCE 0
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
#ifdef __KERNEL__
#include <asm/processor.h>
/* xen binary-compatible interface. See xen headers for details */
struct kvm_vcpu_time_info {
uint32_t version;
uint32_t pad0;
uint64_t tsc_timestamp;
uint64_t system_time;
uint32_t tsc_to_system_mul;
int8_t tsc_shift;
int8_t pad[3];
} __attribute__((__packed__)); /* 32 bytes */
struct kvm_wall_clock {
uint32_t wc_version;
uint32_t wc_sec;
uint32_t wc_nsec;
} __attribute__((__packed__));
extern void kvmclock_init(void);
/* This instruction is vmcall. On non-VT architectures, it will generate a
* trap that we will then rewrite to the appropriate instruction.
*/

1
include/linux/kvm.h
View file

@ -233,6 +233,7 @@ struct kvm_vapic_addr {
#define KVM_CAP_SET_TSS_ADDR 4
#define KVM_CAP_VAPIC 6
#define KVM_CAP_EXT_CPUID 7
#define KVM_CAP_CLOCKSOURCE 8
/*
* ioctls for VM fds