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virtio-pci: Add lookup subregion of VirtIOPCIRegion MR

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Now virtio_address_space_lookup only lookup common/isr/device/notify
MR and exclude their subregions.

When VHOST_USER_PROTOCOL_F_HOST_NOTIFIER enable, the notify MR has
host-notifier subregions and we need use host-notifier MR to
notify the hardware accelerator directly instead of eventfd notify.

Further more, maybe common/isr/device MR also has subregions in
the future, so need memory_region_find for each MR incluing
their subregions.

Add lookup subregion of VirtIOPCIRegion MR instead of only lookup container MR.

Fixes: a93c8d8 ("virtio-pci: Replace modern_as with direct access to modern_bar")
Co-developed-by: Zuo Boqun <zuoboqun@baidu.com>
Signed-off-by: Gao Shiyuan <gaoshiyuan@baidu.com>
Signed-off-by: Zuo Boqun <zuoboqun@baidu.com>
Message-Id: <20240903120304.97833-1-gaoshiyuan@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gao Shiyuan 2024-09-03 20:03:04 +08:00 committed by Michael S. Tsirkin
parent 6166799f69
commit ffa8a3e3b2
1 changed files with 6 additions and 2 deletions
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8
hw/virtio/virtio-pci.c
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@ -615,8 +615,12 @@ static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
reg = &proxy->regs[i];
if (*off >= reg->offset &&
*off + len <= reg->offset + reg->size) {
*off -= reg->offset;
return &reg->mr;
MemoryRegionSection mrs = memory_region_find(&reg->mr,
*off - reg->offset, len);
assert(mrs.mr);
*off = mrs.offset_within_region;
memory_region_unref(mrs.mr);
return mrs.mr;
}
}