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bhyve vtblk: Inform guests of disk resize events.

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Register a resize callback with the blockif interface.  When the
callback fires, update the size of the disk and notify the guest via a
configuration change interrupt.

Reviewed by:	grehan, markj
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D30506
This commit is contained in:
John Baldwin 2021-06-11 17:59:46 -07:00
parent c06676bee3
commit 2349cda44f
1 changed files with 14 additions and 1 deletions
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15
usr.sbin/bhyve/pci_virtio_block.c
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@ -3,7 +3,7 @@
*
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
* Copyright 2020 Joyent, Inc.
* Copyright 2020-2021 Joyent, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -436,6 +436,18 @@ pci_vtblk_notify(void *vsc, struct vqueue_info *vq)
pci_vtblk_proc(sc, vq);
}
static void
pci_vtblk_resized(struct blockif_ctxt *bctxt, void *arg, size_t new_size)
{
struct pci_vtblk_softc *sc;
sc = arg;
sc->vbsc_cfg.vbc_capacity = new_size / VTBLK_BSIZE; /* 512-byte units */
vi_interrupt(&sc->vbsc_vs, VIRTIO_PCI_ISR_CONFIG,
sc->vbsc_vs.vs_msix_cfg_idx);
}
static int
pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
{
@ -541,6 +553,7 @@ pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
return (1);
}
vi_set_io_bar(&sc->vbsc_vs, 0);
blockif_register_resize_callback(sc->bc, pci_vtblk_resized, sc);
return (0);
}