| Message ID | 20191007170622.1814-3-drjones@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | target/arm/kvm: Provide an option to adjust virtual time | expand |
On 10/7/19 1:06 PM, Andrew Jones wrote: > When acceleration like KVM is in use it's necessary to use the host's > counter frequency when converting ticks to or from time units. > > Signed-off-by: Andrew Jones <drjones@redhat.com> > --- > include/qemu/timer.h | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
diff --git a/include/qemu/timer.h b/include/qemu/timer.h index 85bc6eb00b21..8941ddea8242 100644 --- a/include/qemu/timer.h +++ b/include/qemu/timer.h @@ -1006,6 +1006,22 @@ static inline int64_t cpu_get_host_ticks(void) } #endif +#if defined(__aarch64__) +static inline uint32_t cpu_get_host_tick_frequency(void) +{ + uint64_t frq; + asm volatile("mrs %0, cntfrq_el0" : "=r" (frq)); + return frq; +} +#elif defined(__arm__) +static inline uint32_t cpu_get_host_tick_frequency(void) +{ + uint32_t frq; + asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (frq)); + return frq; +} +#endif + #ifdef CONFIG_PROFILER static inline int64_t profile_getclock(void) {
When acceleration like KVM is in use it's necessary to use the host's counter frequency when converting ticks to or from time units. Signed-off-by: Andrew Jones <drjones@redhat.com> --- include/qemu/timer.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)