From 946f4b8680b8ad177f6489e023a1d95e82d502e2 Mon Sep 17 00:00:00 2001 From: Michael Kelley Date: Tue, 2 Mar 2021 13:38:17 -0800 Subject: Drivers: hv: vmbus: Handle auto EOI quirk inline 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 Reviewed-by: Boqun Feng Link: https://lore.kernel.org/r/1614721102-2241-6-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu --- drivers/hv/hv.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers/hv') 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); -- cgit v1.2.3