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| author | Michael Kelley <mhkelley58@gmail.com> | 2026-08-05 13:37:51 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2026-08-24 00:36:14 +0000 |
| commit | be0cfab740e58b70047ef6e7e3d578f00ed5d258 (patch) | |
| tree | 4834df556a6df7427969afa99ce1f009e37bb06d /include/clocksource | |
| parent | 54cf8154186f0267f084a46d21752d5973a25f62 (diff) | |
| download | linux-be0cfab740e58b70047ef6e7e3d578f00ed5d258.tar.gz linux-be0cfab740e58b70047ef6e7e3d578f00ed5d258.zip | |
clocksource: hyper-v: Remove support for stimer interrupts in message mode
In Hyper-V versions prior to WS2016/Win10, Hyper-V synthetic timers
interrupt the guest by delivering a message that is initially handled
by the Linux VMBus driver. Starting with WS2016/Win10, Hyper-V can
deliver stimer interrupts directly to an assigned interrupt vector
without involving the VMBus driver. This is called "Direct Mode".
With the overall removal of Linux support for running on Hyper-V
hosts earlier than WS2016 and Windows 10, it's no longer necessary
to support the legacy message-based delivery. Remove that delivery
mechanism and always use Direct Mode. If for some reason, the
Hyper-V host does not enumerate Direct Mode, output an error
message but continue to run using the LAPIC timer instead of an
stimer.
With these changes, the VMBus driver no longer calls the stimer
interrupt service routine. This removal has a broader benefit in
unblocking the disentangling of VMBus code and stimer code, as
they should be independent of each other. The final disentangling
will come as a follow-on patch set.
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/clocksource')
| -rw-r--r-- | include/clocksource/hyperv_timer.h | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/include/clocksource/hyperv_timer.h b/include/clocksource/hyperv_timer.h index d48dd4176fd3..8d3befb7e667 100644 --- a/include/clocksource/hyperv_timer.h +++ b/include/clocksource/hyperv_timer.h @@ -27,10 +27,7 @@ /* Routines called by the VMbus driver */ extern int hv_stimer_alloc(bool have_percpu_irqs); extern int hv_stimer_cleanup(unsigned int cpu); -extern void hv_stimer_legacy_init(unsigned int cpu, int sint); -extern void hv_stimer_legacy_cleanup(unsigned int cpu); extern void hv_stimer_global_cleanup(void); -extern void hv_stimer0_isr(void); extern void hv_init_clocksource(void); extern void hv_remap_tsc_clocksource(void); @@ -107,10 +104,7 @@ hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg, u64 *cur_tsc, u64 } static inline int hv_stimer_cleanup(unsigned int cpu) { return 0; } -static inline void hv_stimer_legacy_init(unsigned int cpu, int sint) {} -static inline void hv_stimer_legacy_cleanup(unsigned int cpu) {} static inline void hv_stimer_global_cleanup(void) {} -static inline void hv_stimer0_isr(void) {} #endif /* CONFIG_HYPERV_TIMER */ |