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>

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 2590ce5..a6c608d 100644 (file)
--- 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 0c1fa69..afe7a62 100644 (file)
--- 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);