From: Mukesh R <mrathor@linux.microsoft.com>
To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux.dev, linux-arch@vger.kernel.org
Cc: jgg@nvidia.com, jacob.pan@linux.microsoft.com, kys@microsoft.com,
haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
joro@8bytes.org, will@kernel.org, robin.murphy@arm.com,
arnd@arndb.de, mrathor@linux.microsoft.com
Subject: [PATCH V1 1/3] PCI: hv: Export hv_build_devid_type_pci() and change return type
Date: Wed, 23 Sep 2026 19:02:19 -0700 [thread overview]
Message-ID: <20260924020221.128762-2-mrathor@linux.microsoft.com> (raw)
In-Reply-To: <20260924020221.128762-1-mrathor@linux.microsoft.com>
On Hyper-V, most hypercalls related to device domain management like
attach device to a device domain, or to map/unmap regions, interrupts,
etc need a device ID as a parameter. So, make hv_build_devid_type_pci()
public and change return type to u64 to enforce its size.
Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
Reviewed-by: Souradeep Chakrabarti <schakrabarti@linux.microsoft.com>
---
arch/x86/hyperv/irqdomain.c | 9 +++++----
arch/x86/include/asm/mshyperv.h | 6 ++++++
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index b3ad50a874dc..8780573a4332 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -112,7 +112,7 @@ static int get_rid_cb(struct pci_dev *pdev, u16 alias, void *data)
return 0;
}
-static union hv_device_id hv_build_devid_type_pci(struct pci_dev *pdev)
+u64 hv_build_devid_type_pci(struct pci_dev *pdev)
{
int pos;
union hv_device_id hv_devid;
@@ -172,8 +172,9 @@ static union hv_device_id hv_build_devid_type_pci(struct pci_dev *pdev)
}
out:
- return hv_devid;
+ return hv_devid.as_uint64;
}
+EXPORT_SYMBOL_GPL(hv_build_devid_type_pci);
/*
* hv_map_msi_interrupt() - Map the MSI IRQ in the hypervisor.
@@ -196,7 +197,7 @@ int hv_map_msi_interrupt(struct irq_data *data,
msidesc = irq_data_get_msi_desc(data);
pdev = msi_desc_to_pci_dev(msidesc);
- hv_devid = hv_build_devid_type_pci(pdev);
+ hv_devid.as_uint64 = hv_build_devid_type_pci(pdev);
cpu = cpumask_first(irq_data_get_effective_affinity_mask(data));
return hv_map_interrupt(hv_devid, false, cpu, cfg->vector,
@@ -271,7 +272,7 @@ static int hv_unmap_msi_interrupt(struct pci_dev *pdev,
{
union hv_device_id hv_devid;
- hv_devid = hv_build_devid_type_pci(pdev);
+ hv_devid.as_uint64 = hv_build_devid_type_pci(pdev);
return hv_unmap_interrupt(hv_devid.as_uint64, irq_entry);
}
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index f64393e853ee..8ebbd1cb7c8c 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -248,6 +248,12 @@ void hv_crash_asm_end(void);
static inline void hv_root_crash_init(void) {}
#endif /* CONFIG_MSHV_ROOT && CONFIG_CRASH_DUMP */
+#ifdef CONFIG_PCI_MSI
+u64 hv_build_devid_type_pci(struct pci_dev *pdev);
+#else
+static inline u64 hv_build_devid_type_pci(struct pci_dev *pdev) { return 0; }
+#endif
+
#else /* CONFIG_HYPERV */
static inline void hyperv_init(void) {}
static inline void hyperv_setup_mmu_ops(void) {}
--
2.51.2.vfs.0.1
next prev parent reply other threads:[~2026-09-24 2:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 2:02 [PATCH V1 0/3] Hyper-V: root VM iommu kernel only driver Mukesh R
2026-09-24 2:02 ` Mukesh R [this message]
2026-09-24 2:02 ` [PATCH V1 2/3] mshv: Import data structs around device domains from hyperv headers Mukesh R
2026-09-24 2:02 ` [PATCH V1 3/3] x86/hyperv: Implement root VM IOMMU kernel only driver Mukesh R
2026-09-24 13:35 ` Jörg Rödel
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