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pci: give each device its own address space 

Accesses from different devices can resolve differently
(depending on bridge settings, iommus, and PCI_COMMAND_MASTER), so
set up an address space for each device.

Currently iommus are expressed outside the memory API, so this doesn't
work if an iommu is present.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-10-03 17:17:27 +02:00
parent 83f3c25142
commit 817dcc5368
2 changed files with 15 additions and 0 deletions
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14
hw/pci.c
View File

@ -33,6 +33,7 @@
#include "qmp-commands.h"
#include "msi.h"
#include "msix.h"
#include "exec-memory.h"
//#define DEBUG_PCI
#ifdef DEBUG_PCI
@ -777,6 +778,13 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
pci_dev->bus = bus;
if (bus->dma_context_fn) {
pci_dev->dma = bus->dma_context_fn(bus, bus->dma_context_opaque, devfn);
} else {
/* FIXME: Make dma_context_fn use MemoryRegions instead, so this path is
* taken unconditionally */
/* FIXME: inherit memory region from bus creator */
address_space_init(&pci_dev->bus_master_as, get_system_memory());
pci_dev->dma = g_new(DMAContext, 1);
dma_context_init(pci_dev->dma, &pci_dev->bus_master_as, NULL, NULL, NULL);
}
pci_dev->devfn = devfn;
pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
@ -830,6 +838,12 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
qemu_free_irqs(pci_dev->irq);
pci_dev->bus->devices[pci_dev->devfn] = NULL;
pci_config_free(pci_dev);
if (!pci_dev->bus->dma_context_fn) {
address_space_destroy(&pci_dev->bus_master_as);
g_free(pci_dev->dma);
pci_dev->dma = NULL;
}
}
static void pci_unregister_io_regions(PCIDevice *pci_dev)

1
hw/pci.h
View File

@ -211,6 +211,7 @@ struct PCIDevice {
int32_t devfn;
char name[64];
PCIIORegion io_regions[PCI_NUM_REGIONS];
AddressSpace bus_master_as;
DMAContext *dma;
/* do not access the following fields */