linux-kernel - [PATCH v2 3/4] Drivers: hv: vmbus: Add hooks for per-CPU IRQ

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Date:   Wed, 29 Aug 2018 08:22:27 -0700
From:   mhkelley58@...il.com
To:     will.deacon@....com, catalin.marinas@....com, mark.rutland@....com,
        marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com,
        kys@...rosoft.com
Cc:     mikelley@...rosoft.com
Subject: [PATCH v2 3/4] Drivers: hv: vmbus: Add hooks for per-CPU IRQ

From: Michael Kelley <mikelley@...rosoft.com>

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@...rosoft.com>
Reviewed-by: James Morris <jmorris@...ei.org>
---
 arch/x86/include/asm/mshyperv.h | 4 ++++
 drivers/hv/hv.c                 | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index f377044..44ba554 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -109,6 +109,10 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 void hv_setup_vmbus_irq(void (*handler)(void));
 void hv_remove_vmbus_irq(void);
 
+/* 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) {}
+
 void hv_setup_kexec_handler(void (*handler)(void));
 void hv_remove_kexec_handler(void);
 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 748a1c41..f8d1245 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -300,6 +300,7 @@ int hv_synic_init(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 = HYPERVISOR_CALLBACK_VECTOR;
@@ -429,6 +430,7 @@ int hv_synic_cleanup(unsigned int cpu)
 	hv_get_synic_state(sctrl.as_uint64);
 	sctrl.enable = 0;
 	hv_set_synic_state(sctrl.as_uint64);
+	hv_disable_vmbus_irq();
 
 	return 0;
 }
-- 
1.8.3.1