Differential D18831 Diff 56986 head/usr.sbin/bhyve/pci_virtio_block.c

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head/usr.sbin/bhyve/pci_virtio_block.c

/*-		/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD		* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*		*
* Copyright (c) 2011 NetApp, Inc.		* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.		* All rights reserved.
		* Copyright (c) 2019 Joyent, Inc.
*		*
* Redistribution and use in source and binary forms, with or without		* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions		* modification, are permitted provided that the following conditions
* are met:		* are met:
* 1. Redistributions of source code must retain the above copyright		* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.		* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright		* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the		* notice, this list of conditions and the following disclaimer in the
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#include <pthread.h>		#include <pthread.h>
#include <md5.h>		#include <md5.h>

#include "bhyverun.h"		#include "bhyverun.h"
#include "pci_emul.h"		#include "pci_emul.h"
#include "virtio.h"		#include "virtio.h"
#include "block_if.h"		#include "block_if.h"

#define VTBLK_RINGSZ 64		#define VTBLK_RINGSZ 128

		_Static_assert(VTBLK_RINGSZ <= BLOCKIF_RING_MAX, "Each ring entry must be able to queue a request");

#define VTBLK_S_OK 0		#define VTBLK_S_OK 0
#define VTBLK_S_IOERR 1		#define VTBLK_S_IOERR 1
#define VTBLK_S_UNSUPP 2		#define VTBLK_S_UNSUPP 2

#define VTBLK_BLK_ID_BYTES 20 + 1		#define VTBLK_BLK_ID_BYTES 20 + 1

/* Capability bits */		/* Capability bits */
#define VTBLK_F_SEG_MAX (1 << 2) /* Maximum request segments */		#define VTBLK_F_SEG_MAX (1 << 2) /* Maximum request segments */
▲ Show 20 Lines • Show All 278 Lines • ▼ Show 20 Lines	pci_vtblk_init(struct vmctx ctx, struct pci_devinst pi, char *opts)
MD5Final(digest, &mdctx);		MD5Final(digest, &mdctx);
snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES,		snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES,
"BHYVE-%02X%02X-%02X%02X-%02X%02X",		"BHYVE-%02X%02X-%02X%02X-%02X%02X",
digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]);		digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]);

/* setup virtio block config space */		/* setup virtio block config space */
sc->vbsc_cfg.vbc_capacity = size / DEV_BSIZE; /* 512-byte units */		sc->vbsc_cfg.vbc_capacity = size / DEV_BSIZE; /* 512-byte units */
sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */		sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */
sc->vbsc_cfg.vbc_seg_max = BLOCKIF_IOV_MAX;
		/*
		* If Linux is presented with a seg_max greater than the virtio queue
		* size, it can stumble into situations where it violates its own
		* invariants and panics. For safety, we keep seg_max clamped, paying
		* heed to the two extra descriptors needed for the header and status
		* of a request.
		*/
		sc->vbsc_cfg.vbc_seg_max = MIN(VTBLK_RINGSZ - 2, BLOCKIF_IOV_MAX);
sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */		sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */
sc->vbsc_cfg.vbc_geometry.heads = 0;		sc->vbsc_cfg.vbc_geometry.heads = 0;
sc->vbsc_cfg.vbc_geometry.sectors = 0;		sc->vbsc_cfg.vbc_geometry.sectors = 0;
sc->vbsc_cfg.vbc_blk_size = sectsz;		sc->vbsc_cfg.vbc_blk_size = sectsz;
sc->vbsc_cfg.vbc_topology.physical_block_exp =		sc->vbsc_cfg.vbc_topology.physical_block_exp =
(sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0;		(sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0;
sc->vbsc_cfg.vbc_topology.alignment_offset =		sc->vbsc_cfg.vbc_topology.alignment_offset =
(sto != 0) ? ((sts - sto) / sectsz) : 0;		(sto != 0) ? ((sts - sto) / sectsz) : 0;
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