x86/xen/time: Reduce Xen timer tick

Current timer tick is causing some deadline to fail.
The current high value constant was probably due to an old
bug in the Xen timer implementation causing errors if the
deadline was in the future.

This was fixed in Xen commit:
19c6cbd90965 xen/vcpu: ignore VCPU_SSHOTTMR_future

Usage of VCPU_SSHOTTMR_future in Linux kernel was removed by:
c06b6d70feb3 xen/x86: don't lose event interrupts

Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20240619104015.30477-1-frediano.ziglio@cloud.com
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 52fa5609b7f64d13e40583b02fe70f44b92aeab1..96521b1874acfc39995f3b9a138783341097be27 100644 (file)
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -30,7 +30,7 @@
 #include "xen-ops.h"
 
 /* Minimum amount of time until next clock event fires */
-#define TIMER_SLOP     100000
+#define TIMER_SLOP     1
 
 static u64 xen_sched_clock_offset __read_mostly;