Am 07.12.21 um 21:57 schrieb Matthew Rosato:
When doing device passthrough where interrupts are being forwarded
from host to guest, we wish to use a pinned section of guest memory
as the vector (the same memory used by the guest as the vector).
Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
arch/s390/include/asm/airq.h | 4 +++-
arch/s390/pci/pci_irq.c | 8 ++++----
drivers/s390/cio/airq.c | 10 +++++++---
drivers/s390/virtio/virtio_ccw.c | 2 +-
4 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/arch/s390/include/asm/airq.h b/arch/s390/include/asm/airq.h
index 7918a7d09028..e82e5626e139 100644
--- a/arch/s390/include/asm/airq.h
+++ b/arch/s390/include/asm/airq.h
@@ -47,8 +47,10 @@ struct airq_iv {
#define AIRQ_IV_PTR 4 /* Allocate the ptr array */
#define AIRQ_IV_DATA 8 /* Allocate the data array */
#define AIRQ_IV_CACHELINE 16 /* Cacheline alignment for the vector */
+#define AIRQ_IV_GUESTVEC 32 /* Vector is a pinned guest page */
-struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
+struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,
+ unsigned long *vec);
void airq_iv_release(struct airq_iv *iv);
unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 880bcd73f11a..dfd4f3276a6d 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -296,7 +296,7 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
zdev->aisb = bit;
/* Create adapter interrupt vector */
- zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
+ zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK, 0);
if (!zdev->aibv)
return -ENOMEM;
@@ -421,7 +421,7 @@ static int __init zpci_directed_irq_init(void)
union zpci_sic_iib iib = {{0}};
unsigned int cpu;
- zpci_sbv = airq_iv_create(num_possible_cpus(), 0);
+ zpci_sbv = airq_iv_create(num_possible_cpus(), 0, 0);
For a pointer use NULL? Also in other places. With the indentation fix this looks sane.
