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virtio_pci_modern: reduce number of mappings

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We don't know the # of VQs that drivers are going to use so it's hard to
predict how much memory we'll need to map. However, the relevant
capability does give us an upper limit.
If that's below a page, we can reduce the number of required
mappings by mapping it all once ahead of the time.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin
2015-01-14 18:50:55 +02:00
committed by Rusty Russell
parent 89461c4a12
commit 3909213cfd
2 changed files with 52 additions and 8 deletions
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3
drivers/virtio/virtio_pci_common.h
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@@ -62,8 +62,11 @@ struct virtio_pci_device {
struct virtio_pci_common_cfg __iomem *common;
/* Device-specific data (non-legacy mode) */
void __iomem *device;
/* Base of vq notifications (non-legacy mode). */
void __iomem *notify_base;
/* So we can sanity-check accesses. */
size_t notify_len;
size_t device_len;
/* Capability for when we need to map notifications per-vq. */