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authorThomas Gleixner <tglx@linutronix.de>2020-02-07 15:38:54 +0300
committerThomas Gleixner <tglx@linutronix.de>2020-02-17 16:40:22 +0300
commiteec399dd862762b9594df3659f15839a4e12f17a (patch)
tree2ad42d36c099f2ec9b7eceff537281d0bad7c690 /arch/x86/kernel/kvmclock.c
parent3bd142a46b561a12408e8db78cc6d62eb1c6b84e (diff)
downloadlinux-eec399dd862762b9594df3659f15839a4e12f17a.tar.xz
x86/vdso: Move VDSO clocksource state tracking to callback
All architectures which use the generic VDSO code have their own storage for the VDSO clock mode. That's pointless and just requires duplicate code. X86 abuses the function which retrieves the architecture specific clock mode storage to mark the clocksource as used in the VDSO. That's silly because this is invoked on every tick when the VDSO data is updated. Move this functionality to the clocksource::enable() callback so it gets invoked once when the clocksource is installed. This allows to make the clock mode storage generic. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Kelley <mikelley@microsoft.com> (Hyper-V parts) Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> (VDSO parts) Acked-by: Juergen Gross <jgross@suse.com> (Xen parts) Link: https://lkml.kernel.org/r/20200207124402.934519777@linutronix.de
Diffstat (limited to 'arch/x86/kernel/kvmclock.c')
-rw-r--r--arch/x86/kernel/kvmclock.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 904494b924c1..33f2cac25f13 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -159,12 +159,19 @@ bool kvm_check_and_clear_guest_paused(void)
return ret;
}
+static int kvm_cs_enable(struct clocksource *cs)
+{
+ vclocks_set_used(VCLOCK_PVCLOCK);
+ return 0;
+}
+
struct clocksource kvm_clock = {
.name = "kvm-clock",
.read = kvm_clock_get_cycles,
.rating = 400,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .enable = kvm_cs_enable,
};
EXPORT_SYMBOL_GPL(kvm_clock);