diff options
| -rw-r--r-- | hw/msix.c | 47 | ||||
| -rw-r--r-- | hw/msix.h | 3 | ||||
| -rw-r--r-- | hw/pci.h | 2 |
3 files changed, 52 insertions, 0 deletions
diff --git a/hw/msix.c b/hw/msix.c index b64f109326..bafea94084 100644 --- a/hw/msix.c +++ b/hw/msix.c @@ -299,6 +299,45 @@ err_config: return ret; } +int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries, + uint8_t bar_nr) +{ + int ret; + char *name; + + /* + * Migration compatibility dictates that this remains a 4k + * BAR with the vector table in the lower half and PBA in + * the upper half. Do not use these elsewhere! + */ +#define MSIX_EXCLUSIVE_BAR_SIZE 4096 +#define MSIX_EXCLUSIVE_BAR_PBA_OFFSET (MSIX_EXCLUSIVE_BAR_SIZE / 2) + + if (nentries * PCI_MSIX_ENTRY_SIZE > MSIX_EXCLUSIVE_BAR_PBA_OFFSET) { + return -EINVAL; + } + + if (asprintf(&name, "%s-msix", dev->name) == -1) { + return -ENOMEM; + } + + memory_region_init(&dev->msix_exclusive_bar, name, MSIX_EXCLUSIVE_BAR_SIZE); + + free(name); + + ret = msix_init(dev, nentries, &dev->msix_exclusive_bar, bar_nr, + MSIX_EXCLUSIVE_BAR_SIZE); + if (ret) { + memory_region_destroy(&dev->msix_exclusive_bar); + return ret; + } + + pci_register_bar(dev, bar_nr, PCI_BASE_ADDRESS_SPACE_MEMORY, + &dev->msix_exclusive_bar); + + return 0; +} + static void msix_free_irq_entries(PCIDevice *dev) { int vector; @@ -329,6 +368,14 @@ int msix_uninit(PCIDevice *dev, MemoryRegion *bar) return 0; } +void msix_uninit_exclusive_bar(PCIDevice *dev) +{ + if (msix_present(dev)) { + msix_uninit(dev, &dev->msix_exclusive_bar); + memory_region_destroy(&dev->msix_exclusive_bar); + } +} + void msix_save(PCIDevice *dev, QEMUFile *f) { unsigned n = dev->msix_entries_nr; diff --git a/hw/msix.h b/hw/msix.h index 4a17f94540..f681bb0855 100644 --- a/hw/msix.h +++ b/hw/msix.h @@ -7,10 +7,13 @@ int msix_init(PCIDevice *pdev, unsigned short nentries, MemoryRegion *bar, unsigned bar_nr, unsigned bar_size); +int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries, + uint8_t bar_nr); void msix_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len); int msix_uninit(PCIDevice *d, MemoryRegion *bar); +void msix_uninit_exclusive_bar(PCIDevice *dev); unsigned int msix_nr_vectors_allocated(const PCIDevice *dev); diff --git a/hw/pci.h b/hw/pci.h index 3d534e77ae..7344891706 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -222,6 +222,8 @@ struct PCIDevice { /* Space to store MSIX table */ uint8_t *msix_table_page; + /* MemoryRegion container for msix exclusive BAR setup */ + MemoryRegion msix_exclusive_bar; /* MMIO index used to map MSIX table and pending bit entries. */ MemoryRegion msix_mmio; /* Reference-count for entries actually in use by driver. */ |