[PATCH 05/41] Drivers: hv: vmbus: Handle auto EOI quirk inline
Tim Gardner
tim.gardner at canonical.com
Thu Nov 4 12:54:13 UTC 2021
From: Michael Kelley <mikelley at microsoft.com>
BugLink: https://bugs.launchpad.net/bugs/1949770
On x86/x64, Hyper-V provides a flag to indicate auto EOI functionality,
but it doesn't on ARM64. Handle this quirk inline instead of calling
into code under arch/x86 (and coming, under arch/arm64).
No functional change.
Signed-off-by: Michael Kelley <mikelley at microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng at gmail.com>
Link: https://lore.kernel.org/r/1614721102-2241-6-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu at kernel.org>
(cherry picked from commit 946f4b8680b8ad177f6489e023a1d95e82d502e2)
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
---
arch/x86/include/asm/mshyperv.h | 3 ---
drivers/hv/hv.c | 12 +++++++++++-
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 21fa98b840f5..42f5f939c9dc 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -27,9 +27,6 @@ static inline u64 hv_get_register(unsigned int reg)
return value;
}
-#define hv_recommend_using_aeoi() \
- (!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
-
#define hv_set_clocksource_vdso(val) \
((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
#define hv_enable_vdso_clocksource() \
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 0c1fa69381f7..afe7a62b447f 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -219,7 +219,17 @@ void hv_synic_enable_regs(unsigned int cpu)
shared_sint.vector = hv_get_vector();
shared_sint.masked = false;
- shared_sint.auto_eoi = hv_recommend_using_aeoi();
+
+ /*
+ * On architectures where Hyper-V doesn't support AEOI (e.g., ARM64),
+ * it doesn't provide a recommendation flag and AEOI must be disabled.
+ */
+#ifdef HV_DEPRECATING_AEOI_RECOMMENDED
+ shared_sint.auto_eoi =
+ !(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED);
+#else
+ shared_sint.auto_eoi = 0;
+#endif
hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
shared_sint.as_uint64);
--
2.33.1
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