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![Zhao Liu](/assets/img/avatar_default.png)
As the comment in qapi/error, passing @errp to error_prepend() requires
ERRP_GUARD():
* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
...
* - It should not be passed to error_prepend(), error_vprepend() or
* error_append_hint(), because that doesn't work with &error_fatal.
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.
ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user
can't see this additional information, because exit() happens in
error_setg earlier than information is added [1].
In hw/vfio/helpers.c, there are 3 functions passing @errp to
error_prepend() without ERRP_GUARD():
- vfio_set_irq_signaling()
- vfio_device_get_name()
- vfio_device_set_fd()
There are too many possible callers to check the impact of this defect;
it may or may not be harmless. Thus it is necessary to protect their
@errp with ERRP_GUARD().
To avoid the issue like [1] said, add missing ERRP_GUARD() at their
beginning.
[1]: Issue description in the commit message of commit ae7c80a7bd
("error: New macro ERRP_GUARD()").
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Message-ID: <20240311033822.3142585-21-zhao1.liu@linux.intel.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
669 lines
18 KiB
C
669 lines
18 KiB
C
/*
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* low level and IOMMU backend agnostic helpers used by VFIO devices,
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* related to regions, interrupts, capabilities
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Authors:
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* Alex Williamson <alex.williamson@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Based on qemu-kvm device-assignment:
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* Adapted for KVM by Qumranet.
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* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
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* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
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* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
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* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
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* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
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*/
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#include "qemu/osdep.h"
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#include <sys/ioctl.h>
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#include "hw/vfio/vfio-common.h"
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#include "hw/hw.h"
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#include "trace.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "monitor/monitor.h"
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/*
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* Common VFIO interrupt disable
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*/
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void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
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.index = index,
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.start = 0,
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.count = 0,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
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.index = index,
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.start = 0,
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.count = 1,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
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.index = index,
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.start = 0,
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.count = 1,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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static inline const char *action_to_str(int action)
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{
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switch (action) {
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case VFIO_IRQ_SET_ACTION_MASK:
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return "MASK";
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case VFIO_IRQ_SET_ACTION_UNMASK:
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return "UNMASK";
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case VFIO_IRQ_SET_ACTION_TRIGGER:
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return "TRIGGER";
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default:
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return "UNKNOWN ACTION";
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}
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}
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static const char *index_to_str(VFIODevice *vbasedev, int index)
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{
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if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
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return NULL;
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}
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switch (index) {
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case VFIO_PCI_INTX_IRQ_INDEX:
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return "INTX";
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case VFIO_PCI_MSI_IRQ_INDEX:
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return "MSI";
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case VFIO_PCI_MSIX_IRQ_INDEX:
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return "MSIX";
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case VFIO_PCI_ERR_IRQ_INDEX:
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return "ERR";
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case VFIO_PCI_REQ_IRQ_INDEX:
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return "REQ";
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default:
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return NULL;
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}
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}
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int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex,
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int action, int fd, Error **errp)
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{
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ERRP_GUARD();
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struct vfio_irq_set *irq_set;
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int argsz, ret = 0;
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const char *name;
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int32_t *pfd;
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argsz = sizeof(*irq_set) + sizeof(*pfd);
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irq_set = g_malloc0(argsz);
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irq_set->argsz = argsz;
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irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action;
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irq_set->index = index;
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irq_set->start = subindex;
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irq_set->count = 1;
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pfd = (int32_t *)&irq_set->data;
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*pfd = fd;
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if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
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ret = -errno;
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}
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g_free(irq_set);
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if (!ret) {
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return 0;
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}
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error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure");
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name = index_to_str(vbasedev, index);
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if (name) {
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error_prepend(errp, "%s-%d: ", name, subindex);
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} else {
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error_prepend(errp, "index %d-%d: ", index, subindex);
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}
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error_prepend(errp,
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"Failed to %s %s eventfd signaling for interrupt ",
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fd < 0 ? "tear down" : "set up", action_to_str(action));
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return ret;
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}
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/*
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* IO Port/MMIO - Beware of the endians, VFIO is always little endian
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*/
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void vfio_region_write(void *opaque, hwaddr addr,
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uint64_t data, unsigned size)
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{
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VFIORegion *region = opaque;
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VFIODevice *vbasedev = region->vbasedev;
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union {
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uint8_t byte;
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uint16_t word;
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uint32_t dword;
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uint64_t qword;
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} buf;
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switch (size) {
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case 1:
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buf.byte = data;
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break;
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case 2:
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buf.word = cpu_to_le16(data);
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break;
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case 4:
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buf.dword = cpu_to_le32(data);
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break;
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case 8:
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buf.qword = cpu_to_le64(data);
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break;
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default:
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hw_error("vfio: unsupported write size, %u bytes", size);
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break;
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}
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if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
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error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
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",%d) failed: %m",
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__func__, vbasedev->name, region->nr,
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addr, data, size);
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}
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trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
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/*
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* A read or write to a BAR always signals an INTx EOI. This will
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* do nothing if not pending (including not in INTx mode). We assume
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* that a BAR access is in response to an interrupt and that BAR
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* accesses will service the interrupt. Unfortunately, we don't know
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* which access will service the interrupt, so we're potentially
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* getting quite a few host interrupts per guest interrupt.
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*/
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vbasedev->ops->vfio_eoi(vbasedev);
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}
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uint64_t vfio_region_read(void *opaque,
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hwaddr addr, unsigned size)
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{
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VFIORegion *region = opaque;
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VFIODevice *vbasedev = region->vbasedev;
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union {
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uint8_t byte;
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uint16_t word;
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uint32_t dword;
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uint64_t qword;
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} buf;
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uint64_t data = 0;
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if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
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error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
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__func__, vbasedev->name, region->nr,
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addr, size);
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return (uint64_t)-1;
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}
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switch (size) {
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case 1:
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data = buf.byte;
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break;
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case 2:
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data = le16_to_cpu(buf.word);
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break;
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case 4:
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data = le32_to_cpu(buf.dword);
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break;
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case 8:
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data = le64_to_cpu(buf.qword);
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break;
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default:
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hw_error("vfio: unsupported read size, %u bytes", size);
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break;
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}
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trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
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/* Same as write above */
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vbasedev->ops->vfio_eoi(vbasedev);
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return data;
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}
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const MemoryRegionOps vfio_region_ops = {
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.read = vfio_region_read,
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.write = vfio_region_write,
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.endianness = DEVICE_LITTLE_ENDIAN,
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.valid = {
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.min_access_size = 1,
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.max_access_size = 8,
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},
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.impl = {
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.min_access_size = 1,
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.max_access_size = 8,
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},
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};
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int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
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{
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vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
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vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) /
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BITS_PER_BYTE;
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vbmap->bitmap = g_try_malloc0(vbmap->size);
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if (!vbmap->bitmap) {
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return -ENOMEM;
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}
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return 0;
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}
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struct vfio_info_cap_header *
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vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
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{
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struct vfio_info_cap_header *hdr;
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for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
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if (hdr->id == id) {
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return hdr;
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}
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}
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return NULL;
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}
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struct vfio_info_cap_header *
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vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
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{
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if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
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return NULL;
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}
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return vfio_get_cap((void *)info, info->cap_offset, id);
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}
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struct vfio_info_cap_header *
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vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id)
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{
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if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) {
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return NULL;
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}
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return vfio_get_cap((void *)info, info->cap_offset, id);
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}
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static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
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struct vfio_region_info *info)
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{
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struct vfio_info_cap_header *hdr;
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struct vfio_region_info_cap_sparse_mmap *sparse;
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int i, j;
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hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP);
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if (!hdr) {
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return -ENODEV;
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}
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sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header);
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trace_vfio_region_sparse_mmap_header(region->vbasedev->name,
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region->nr, sparse->nr_areas);
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region->mmaps = g_new0(VFIOMmap, sparse->nr_areas);
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for (i = 0, j = 0; i < sparse->nr_areas; i++) {
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if (sparse->areas[i].size) {
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trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset,
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sparse->areas[i].offset +
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sparse->areas[i].size - 1);
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region->mmaps[j].offset = sparse->areas[i].offset;
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region->mmaps[j].size = sparse->areas[i].size;
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j++;
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}
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}
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region->nr_mmaps = j;
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region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap));
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return 0;
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}
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int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
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int index, const char *name)
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{
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struct vfio_region_info *info;
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int ret;
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ret = vfio_get_region_info(vbasedev, index, &info);
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if (ret) {
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return ret;
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}
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region->vbasedev = vbasedev;
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region->flags = info->flags;
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region->size = info->size;
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region->fd_offset = info->offset;
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region->nr = index;
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if (region->size) {
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region->mem = g_new0(MemoryRegion, 1);
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memory_region_init_io(region->mem, obj, &vfio_region_ops,
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region, name, region->size);
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if (!vbasedev->no_mmap &&
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region->flags & VFIO_REGION_INFO_FLAG_MMAP) {
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ret = vfio_setup_region_sparse_mmaps(region, info);
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if (ret) {
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region->nr_mmaps = 1;
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region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
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region->mmaps[0].offset = 0;
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region->mmaps[0].size = region->size;
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}
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}
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}
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g_free(info);
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trace_vfio_region_setup(vbasedev->name, index, name,
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region->flags, region->fd_offset, region->size);
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return 0;
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}
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static void vfio_subregion_unmap(VFIORegion *region, int index)
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{
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trace_vfio_region_unmap(memory_region_name(®ion->mmaps[index].mem),
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region->mmaps[index].offset,
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region->mmaps[index].offset +
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region->mmaps[index].size - 1);
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memory_region_del_subregion(region->mem, ®ion->mmaps[index].mem);
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munmap(region->mmaps[index].mmap, region->mmaps[index].size);
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object_unparent(OBJECT(®ion->mmaps[index].mem));
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region->mmaps[index].mmap = NULL;
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}
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int vfio_region_mmap(VFIORegion *region)
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{
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int i, prot = 0;
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char *name;
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if (!region->mem) {
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return 0;
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}
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prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
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prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
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for (i = 0; i < region->nr_mmaps; i++) {
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region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
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MAP_SHARED, region->vbasedev->fd,
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region->fd_offset +
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region->mmaps[i].offset);
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if (region->mmaps[i].mmap == MAP_FAILED) {
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int ret = -errno;
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trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
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region->fd_offset +
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region->mmaps[i].offset,
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region->fd_offset +
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region->mmaps[i].offset +
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region->mmaps[i].size - 1, ret);
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region->mmaps[i].mmap = NULL;
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for (i--; i >= 0; i--) {
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vfio_subregion_unmap(region, i);
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}
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return ret;
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}
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name = g_strdup_printf("%s mmaps[%d]",
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memory_region_name(region->mem), i);
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memory_region_init_ram_device_ptr(®ion->mmaps[i].mem,
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memory_region_owner(region->mem),
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name, region->mmaps[i].size,
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region->mmaps[i].mmap);
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g_free(name);
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memory_region_add_subregion(region->mem, region->mmaps[i].offset,
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®ion->mmaps[i].mem);
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trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem),
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region->mmaps[i].offset,
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region->mmaps[i].offset +
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region->mmaps[i].size - 1);
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}
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return 0;
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}
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|
|
void vfio_region_unmap(VFIORegion *region)
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{
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int i;
|
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|
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if (!region->mem) {
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return;
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}
|
|
|
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for (i = 0; i < region->nr_mmaps; i++) {
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if (region->mmaps[i].mmap) {
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vfio_subregion_unmap(region, i);
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}
|
|
}
|
|
}
|
|
|
|
void vfio_region_exit(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_exit(region->vbasedev->name, region->nr);
|
|
}
|
|
|
|
void vfio_region_finalize(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
munmap(region->mmaps[i].mmap, region->mmaps[i].size);
|
|
object_unparent(OBJECT(®ion->mmaps[i].mem));
|
|
}
|
|
}
|
|
|
|
object_unparent(OBJECT(region->mem));
|
|
|
|
g_free(region->mem);
|
|
g_free(region->mmaps);
|
|
|
|
trace_vfio_region_finalize(region->vbasedev->name, region->nr);
|
|
|
|
region->mem = NULL;
|
|
region->mmaps = NULL;
|
|
region->nr_mmaps = 0;
|
|
region->size = 0;
|
|
region->flags = 0;
|
|
region->nr = 0;
|
|
}
|
|
|
|
void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_set_enabled(®ion->mmaps[i].mem, enabled);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
|
|
enabled);
|
|
}
|
|
|
|
int vfio_get_region_info(VFIODevice *vbasedev, int index,
|
|
struct vfio_region_info **info)
|
|
{
|
|
size_t argsz = sizeof(struct vfio_region_info);
|
|
|
|
*info = g_malloc0(argsz);
|
|
|
|
(*info)->index = index;
|
|
retry:
|
|
(*info)->argsz = argsz;
|
|
|
|
if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
|
|
g_free(*info);
|
|
*info = NULL;
|
|
return -errno;
|
|
}
|
|
|
|
if ((*info)->argsz > argsz) {
|
|
argsz = (*info)->argsz;
|
|
*info = g_realloc(*info, argsz);
|
|
|
|
goto retry;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
|
|
uint32_t subtype, struct vfio_region_info **info)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < vbasedev->num_regions; i++) {
|
|
struct vfio_info_cap_header *hdr;
|
|
struct vfio_region_info_cap_type *cap_type;
|
|
|
|
if (vfio_get_region_info(vbasedev, i, info)) {
|
|
continue;
|
|
}
|
|
|
|
hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
|
|
if (!hdr) {
|
|
g_free(*info);
|
|
continue;
|
|
}
|
|
|
|
cap_type = container_of(hdr, struct vfio_region_info_cap_type, header);
|
|
|
|
trace_vfio_get_dev_region(vbasedev->name, i,
|
|
cap_type->type, cap_type->subtype);
|
|
|
|
if (cap_type->type == type && cap_type->subtype == subtype) {
|
|
return 0;
|
|
}
|
|
|
|
g_free(*info);
|
|
}
|
|
|
|
*info = NULL;
|
|
return -ENODEV;
|
|
}
|
|
|
|
bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type)
|
|
{
|
|
struct vfio_region_info *info = NULL;
|
|
bool ret = false;
|
|
|
|
if (!vfio_get_region_info(vbasedev, region, &info)) {
|
|
if (vfio_get_region_info_cap(info, cap_type)) {
|
|
ret = true;
|
|
}
|
|
g_free(info);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int vfio_device_get_name(VFIODevice *vbasedev, Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
struct stat st;
|
|
|
|
if (vbasedev->fd < 0) {
|
|
if (stat(vbasedev->sysfsdev, &st) < 0) {
|
|
error_setg_errno(errp, errno, "no such host device");
|
|
error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->sysfsdev);
|
|
return -errno;
|
|
}
|
|
/* User may specify a name, e.g: VFIO platform device */
|
|
if (!vbasedev->name) {
|
|
vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
|
|
}
|
|
} else {
|
|
if (!vbasedev->iommufd) {
|
|
error_setg(errp, "Use FD passing only with iommufd backend");
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Give a name with fd so any function printing out vbasedev->name
|
|
* will not break.
|
|
*/
|
|
if (!vbasedev->name) {
|
|
vbasedev->name = g_strdup_printf("VFIO_FD%d", vbasedev->fd);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
int fd = monitor_fd_param(monitor_cur(), str, errp);
|
|
|
|
if (fd < 0) {
|
|
error_prepend(errp, "Could not parse remote object fd %s:", str);
|
|
return;
|
|
}
|
|
vbasedev->fd = fd;
|
|
}
|
|
|
|
void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
|
|
DeviceState *dev, bool ram_discard)
|
|
{
|
|
vbasedev->type = type;
|
|
vbasedev->ops = ops;
|
|
vbasedev->dev = dev;
|
|
vbasedev->fd = -1;
|
|
|
|
vbasedev->ram_block_discard_allowed = ram_discard;
|
|
}
|