linux-kernel - [PATCH 5/9] iommu/hyper-v: Implement select() method on remapping irqdomain

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Message-Id: <20201013081139.1558200-6-dwmw2@infradead.org>
Date:   Tue, 13 Oct 2020 09:11:35 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     x86@...nel.org
Cc:     kvm <kvm@...r.kernel.org>, iommu@...ts.linux-foundation.org,
        joro@...tes.org, Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-hyperv@...r.kernel.org, maz@...terjones.org
Subject: [PATCH 5/9] iommu/hyper-v: Implement select() method on remapping irqdomain

From: David Woodhouse <dwmw@...zon.co.uk>

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 drivers/iommu/hyperv-iommu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index 37dd485a5640..6a8966fbc3bd 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -61,6 +61,14 @@ static struct irq_chip hyperv_ir_chip = {
 	.irq_set_affinity	= hyperv_ir_set_affinity,
 };
 
+static int hyperv_irq_remapping_select(struct irq_domain *d,
+				       struct irq_fwspec *fwspec,
+				       enum irq_domain_bus_token bus_token)
+{
+	/* Claim only the first (and only) I/OAPIC */
+	return x86_fwspec_is_ioapic(fwspec) && fwspec->param[0] == 0;
+}
+
 static int hyperv_irq_remapping_alloc(struct irq_domain *domain,
 				     unsigned int virq, unsigned int nr_irqs,
 				     void *arg)
@@ -102,6 +110,7 @@ static void hyperv_irq_remapping_free(struct irq_domain *domain,
 }
 
 static const struct irq_domain_ops hyperv_ir_domain_ops = {
+	.select = hyperv_irq_remapping_select,
 	.alloc = hyperv_irq_remapping_alloc,
 	.free = hyperv_irq_remapping_free,
 };
-- 
2.26.2