mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 14:44:12 +00:00
Code Issues Releases Wiki Activity

Drivers: hv: vmbus: Handle auto EOI quirk inline

Browse source 
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@microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/1614721102-2241-6-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley 2021-03-02 13:38:17 -08:00 committed by Wei Liu
parent b548a77427
commit 946f4b8680
2 changed files with 11 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/include/asm/mshyperv.h
View file

@ -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() \

12
drivers/hv/hv.c
View file

@ -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);