[PATCH v0 03/15] x86/hyperv: add insufficient memory support in irqdomain.c

Mukesh R
2026-01-20T06:43:33Z

From: Mukesh Rathor <mrathor@linux.microsoft.com>

Passthru exposes insufficient memory hypercall failure in the current map
device interrupt hypercall. In case of such a failure, we must deposit
more memory and redo the hypercall. Add support for that. Deposit memory
needs partition id, make that a parameter to the map interrupt function.

Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
---
arch/x86/hyperv/irqdomain.c | 38 +++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index f6b61483b3b8..ccbe5848a28f 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -13,8 +13,9 @@
#include <linux/irqchip/irq-msi-lib.h>
#include <asm/mshyperv.h>

-static int hv_map_interrupt(union hv_device_id hv_devid, bool level,
- int cpu, int vector, struct hv_interrupt_entry *ret_entry)
+static u64 hv_map_interrupt_hcall(u64 ptid, union hv_device_id hv_devid,
+ bool level, int cpu, int vector,
+ struct hv_interrupt_entry *ret_entry)
{
struct hv_input_map_device_interrupt *input;
struct hv_output_map_device_interrupt *output;
@@ -30,8 +31,10 @@ static int hv_map_interrupt(union hv_device_id hv_devid, bool level,

intr_desc = &input->interrupt_descriptor;
memset(input, 0, sizeof(*input));
- input->partition_id = hv_current_partition_id;
+
+ input->partition_id = ptid;
input->device_id = hv_devid.as_uint64;
+
intr_desc->interrupt_type = HV_X64_INTERRUPT_TYPE_FIXED;
intr_desc->vector_count = 1;
intr_desc->target.vector = vector;
@@ -64,6 +67,28 @@ static int hv_map_interrupt(union hv_device_id hv_devid, bool level,

local_irq_restore(flags);

+ return status;
+}
+
+static int hv_map_interrupt(u64 ptid, union hv_device_id device_id, bool level,
+ int cpu, int vector,
+ struct hv_interrupt_entry *ret_entry)
+{
+ u64 status;
+ int rc, deposit_pgs = 16; /* don't loop forever */
+
+ while (deposit_pgs--) {
+ status = hv_map_interrupt_hcall(ptid, device_id, level, cpu,
+ vector, ret_entry);
+
+ if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY)
+ break;
+
+ rc = hv_call_deposit_pages(NUMA_NO_NODE, ptid, 1);
+ if (rc)
+ break;
+ };
+
if (!hv_result_success(status))
hv_status_err(status, "\n");

@@ -199,8 +224,8 @@ int hv_map_msi_interrupt(struct irq_data *data,
hv_devid = 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,
- out_entry ? out_entry : &dummy);
+ return hv_map_interrupt(hv_current_partition_id, hv_devid, false, cpu,
+ cfg->vector, out_entry ? out_entry : &dummy);
}
EXPORT_SYMBOL_GPL(hv_map_msi_interrupt);

@@ -422,6 +447,7 @@ int hv_map_ioapic_interrupt(int ioapic_id, bool level, int cpu, int vector,
hv_devid.device_type = HV_DEVICE_TYPE_IOAPIC;
hv_devid.ioapic.ioapic_id = (u8)ioapic_id;

- return hv_map_interrupt(hv_devid, level, cpu, vector, entry);
+ return hv_map_interrupt(hv_current_partition_id, hv_devid, level, cpu,
+ vector, entry);
}
EXPORT_SYMBOL_GPL(hv_map_ioapic_interrupt);
--
2.51.2.vfs.0.1