Add hooks to enable/disable a per-CPU IRQ for VMbus. These hooks
are in the architecture independent setup and shutdown paths for
Hyper-V, and are needed by Linux guests on Hyper-V on ARM64. The
x86/x64 implementation is null because VMbus interrupts on x86/x64
don't use an IRQ.
Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
---
arch/x86/include/asm/mshyperv.h | 4 ++++
drivers/hv/hv.c | 3 +++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index ffc2899..dd1365c 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -56,6 +56,10 @@ typedef int (*hyperv_fill_flush_list_func)(
#define hv_get_raw_timer() rdtsc_ordered()
#define hv_get_vector() HYPERVISOR_CALLBACK_VECTOR
+/* On x86/x64, there isn't a real IRQ to be enabled/disable */
+static inline void hv_enable_vmbus_irq(void) {}
+static inline void hv_disable_vmbus_irq(void) {}
+
/*
* Reference to pv_ops must be inline so objtool
* detection of noinstr violations can work correctly.
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 2bd44fd..7499079 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -178,6 +178,7 @@ void hv_synic_enable_regs(unsigned int cpu)
hv_set_siefp(siefp.as_uint64);
/* Setup the shared SINT. */
+ hv_enable_vmbus_irq();
hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
shared_sint.vector = hv_get_vector();
@@ -235,6 +236,8 @@ void hv_synic_disable_regs(unsigned int cpu)
hv_get_synic_state(sctrl.as_uint64);
sctrl.enable = 0;
hv_set_synic_state(sctrl.as_uint64);
+
+ hv_disable_vmbus_irq();
}
int hv_synic_cleanup(unsigned int cpu)
--
1.8.3.1
