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pci-testdev.c: Add membar-backed option for backing membar

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The pci-testdev device allows for an optional BAR. We have
historically used this without backing to test that systems and OSes
can accomodate large PCI BARs. However to help test p2pdma operations
it is helpful to add an option to back this BAR with host memory.

We add a membar-backed boolean parameter and when set to true or on we
do a host RAM backing. The default is false which ensures backward
compatability.

Signed-off-by: Stephen Bates <sbates@raithlin.com>
Message-Id: <Z_6JhDtn5PlaDgB_@MKMSTEBATES01.amd.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stephen Bates 2025-04-15 10:29:56 -06:00 • committed by Michael S. Tsirkin
parent d0c280d3fa
commit 8717987fb5
1 changed files with 10 additions and 2 deletions
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12
hw/misc/pci-testdev.c
View file

@ -90,6 +90,7 @@ struct PCITestDevState {
int current;
uint64_t membar_size;
bool membar_backed;
MemoryRegion membar;
};
@ -258,8 +259,14 @@ static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp)
pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio);
if (d->membar_size) {
memory_region_init(&d->membar, OBJECT(d), "pci-testdev-membar",
d->membar_size);
if (d->membar_backed)
memory_region_init_ram(&d->membar, OBJECT(d),
"pci-testdev-membar-backed",
d->membar_size, NULL);
else
memory_region_init(&d->membar, OBJECT(d),
"pci-testdev-membar",
d->membar_size);
pci_register_bar(pci_dev, 2,
PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_PREFETCH |
@ -321,6 +328,7 @@ static void qdev_pci_testdev_reset(DeviceState *dev)
static const Property pci_testdev_properties[] = {
DEFINE_PROP_SIZE("membar", PCITestDevState, membar_size, 0),
DEFINE_PROP_BOOL("membar-backed", PCITestDevState, membar_backed, false),
};
static void pci_testdev_class_init(ObjectClass *klass, const void *data)