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x86/hyperv: Expose hv_map_msi_interrupt()

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Move some of the logic of hv_irq_compose_irq_message() into
hv_map_msi_interrupt(). Make hv_map_msi_interrupt() a globally-available
helper function, which will be used to map PCI interrupts when running
in the root partition.

Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1752261532-7225-3-git-send-email-nunodasneves@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1752261532-7225-3-git-send-email-nunodasneves@linux.microsoft.com>
This commit is contained in:
Stanislav Kinsburskii 2025-07-11 12:18:51 -07:00 committed by Wei Liu
parent 36c46e64c5
commit 52a45f870e
2 changed files with 31 additions and 11 deletions
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40
arch/x86/hyperv/irqdomain.c
View File

@ -173,13 +173,34 @@ static union hv_device_id hv_build_pci_dev_id(struct pci_dev *dev)
return dev_id;
}
static int hv_map_msi_interrupt(struct pci_dev *dev, int cpu, int vector,
struct hv_interrupt_entry *entry)
/**
* hv_map_msi_interrupt() - "Map" the MSI IRQ in the hypervisor.
* @data: Describes the IRQ
* @out_entry: Hypervisor (MSI) interrupt entry (can be NULL)
*
* Map the IRQ in the hypervisor by issuing a MAP_DEVICE_INTERRUPT hypercall.
*
* Return: 0 on success, -errno on failure
*/
int hv_map_msi_interrupt(struct irq_data *data,
struct hv_interrupt_entry *out_entry)
{
union hv_device_id device_id = hv_build_pci_dev_id(dev);
struct irq_cfg *cfg = irqd_cfg(data);
struct hv_interrupt_entry dummy;
union hv_device_id device_id;
struct msi_desc *msidesc;
struct pci_dev *dev;
int cpu;
return hv_map_interrupt(device_id, false, cpu, vector, entry);
msidesc = irq_data_get_msi_desc(data);
dev = msi_desc_to_pci_dev(msidesc);
device_id = hv_build_pci_dev_id(dev);
cpu = cpumask_first(irq_data_get_effective_affinity_mask(data));
return hv_map_interrupt(device_id, false, cpu, cfg->vector,
out_entry ? out_entry : &dummy);
}
EXPORT_SYMBOL_GPL(hv_map_msi_interrupt);
static inline void entry_to_msi_msg(struct hv_interrupt_entry *entry, struct msi_msg *msg)
{
@ -192,11 +213,11 @@ static inline void entry_to_msi_msg(struct hv_interrupt_entry *entry, struct msi
static int hv_unmap_msi_interrupt(struct pci_dev *dev, struct hv_interrupt_entry *old_entry);
static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
struct hv_interrupt_entry out_entry, *stored_entry;
struct hv_interrupt_entry *stored_entry;
struct irq_cfg *cfg = irqd_cfg(data);
struct msi_desc *msidesc;
struct pci_dev *dev;
int cpu, ret;
int ret;
msidesc = irq_data_get_msi_desc(data);
dev = msi_desc_to_pci_dev(msidesc);
@ -206,8 +227,6 @@ static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return;
}
cpu = cpumask_first(irq_data_get_effective_affinity_mask(data));
if (data->chip_data) {
/*
* This interrupt is already mapped. Let's unmap first.
@ -234,15 +253,14 @@ static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return;
}
ret = hv_map_msi_interrupt(dev, cpu, cfg->vector, &out_entry);
ret = hv_map_msi_interrupt(data, stored_entry);
if (ret) {
kfree(stored_entry);
return;
}
*stored_entry = out_entry;
data->chip_data = stored_entry;
entry_to_msi_msg(&out_entry, msg);
entry_to_msi_msg(data->chip_data, msg);
return;
}

2
arch/x86/include/asm/mshyperv.h
View File

@ -242,6 +242,8 @@ static inline void hv_apic_init(void) {}
struct irq_domain *hv_create_pci_msi_domain(void);
int hv_map_msi_interrupt(struct irq_data *data,
struct hv_interrupt_entry *out_entry);
int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
struct hv_interrupt_entry *entry);
int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);