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libqos: Give qvirtio_config_read*() consistent semantics

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The 'addr' parameter to qvirtio_config_read*() doesn't have a consistent
meaning: when using the virtio-pci versions, it's a full PCI space address,
but for virtio-mmio, it's an offset from the device's base mmio address.

This means that the callers need to do different things to calculate the
addresses in the two cases, which rather defeats the purpose of function
pointer backends.

All the current users of these functions are using them to retrieve
variables from the device specific portion of the virtio config space.
So, this patch alters the semantics to always be an offset into that
device specific config area.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
David Gibson 2016-10-20 14:08:07 +11:00
parent a37eb9fccd
commit 246fc0fb66
5 changed files with 36 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

8
tests/virtio-9p-test.c
View file

@ -95,7 +95,6 @@ static void qvirtio_9p_pci_free(QVirtIO9P *v9p)
static void pci_basic_config(void)
{
QVirtIO9P *v9p;
void *addr;
size_t tag_len;
char *tag;
int i;
@ -104,15 +103,12 @@ static void pci_basic_config(void)
qs = qvirtio_9p_start();
v9p = qvirtio_9p_pci_init(qs);
addr = ((QVirtioPCIDevice *) v9p->dev)->addr + VIRTIO_PCI_CONFIG_OFF(false);
tag_len = qvirtio_config_readw(v9p->dev,
(uint64_t)(uintptr_t)addr);
tag_len = qvirtio_config_readw(v9p->dev, 0);
g_assert_cmpint(tag_len, ==, strlen(mount_tag));
addr += sizeof(uint16_t);
tag = g_malloc(tag_len);
for (i = 0; i < tag_len; i++) {
tag[i] = qvirtio_config_readb(v9p->dev, (uint64_t)(uintptr_t)addr + i);
tag[i] = qvirtio_config_readb(v9p->dev, i + 2);
}
g_assert_cmpmem(tag, tag_len, mount_tag, tag_len);
g_free(tag);