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| author |   Michael Kelley <mikelley@microsoft.com> | 2021-03-02 13:38:17 -0800 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2021-03-08 17:32:59 +0000 |
| commit | 946f4b8680b8ad177f6489e023a1d95e82d502e2 (patch) | |
| tree | a6666cd372480c9c0eec0e37ecb0d7e48a883bdc /drivers/hv | |
| parent | Drivers: hv: vmbus: Move hyperv_report_panic_msg to arch neutral code (diff) | |
| download | linux-dev-946f4b8680b8ad177f6489e023a1d95e82d502e2.tar.xz linux-dev-946f4b8680b8ad177f6489e023a1d95e82d502e2.zip | |
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 <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>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv.c | 12 |
1 files changed, 11 insertions, 1 deletions
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); |