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/*
* low level and IOMMU backend agnostic helpers used by VFIO devices,
* related to regions, interrupts, capabilities
*
* Copyright Red Hat, Inc. 2012
*
* Authors:
* Alex Williamson <alex.williamson@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Based on qemu-kvm device-assignment:
* Adapted for KVM by Qumranet.
* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include "system/kvm.h"
#include "hw/vfio/vfio-device.h"
#include "hw/hw.h"
#include "qapi/error.h"
#include "vfio-helpers.h"
int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
{
vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) /
BITS_PER_BYTE;
vbmap->bitmap = g_try_malloc0(vbmap->size);
if (!vbmap->bitmap) {
return -ENOMEM;
}
return 0;
}
struct vfio_info_cap_header *
vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
{
struct vfio_info_cap_header *hdr;
for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
if (hdr->id == id) {
return hdr;
}
}
return NULL;
}
struct vfio_info_cap_header *
vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
{
if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
return NULL;
}
return vfio_get_cap((void *)info, info->cap_offset, id);
}
struct vfio_info_cap_header *
vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id)
{
if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) {
return NULL;
}
return vfio_get_cap((void *)info, info->cap_offset, id);
}
struct vfio_info_cap_header *
vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
{
if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
return NULL;
}
return vfio_get_cap((void *)info, info->cap_offset, id);
}
bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
unsigned int *avail)
{
struct vfio_info_cap_header *hdr;
struct vfio_iommu_type1_info_dma_avail *cap;
/* If the capability cannot be found, assume no DMA limiting */
hdr = vfio_get_iommu_type1_info_cap(info,
VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
if (!hdr) {
return false;
}
if (avail != NULL) {
cap = (void *) hdr;
*avail = cap->avail;
}
return true;
}
#ifdef CONFIG_KVM
/*
* We have a single VFIO pseudo device per KVM VM. Once created it lives
* for the life of the VM. Closing the file descriptor only drops our
* reference to it and the device's reference to kvm. Therefore once
* initialized, this file descriptor is only released on QEMU exit and
* we'll re-use it should another vfio device be attached before then.
*/
int vfio_kvm_device_fd = -1;
#endif
int vfio_kvm_device_add_fd(int fd, Error **errp)
{
#ifdef CONFIG_KVM
struct kvm_device_attr attr = {
.group = KVM_DEV_VFIO_FILE,
.attr = KVM_DEV_VFIO_FILE_ADD,
.addr = (uint64_t)(unsigned long)&fd,
};
if (!kvm_enabled()) {
return 0;
}
if (vfio_kvm_device_fd < 0) {
struct kvm_create_device cd = {
.type = KVM_DEV_TYPE_VFIO,
};
if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
error_setg_errno(errp, errno, "Failed to create KVM VFIO device");
return -errno;
}
vfio_kvm_device_fd = cd.fd;
}
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
error_setg_errno(errp, errno, "Failed to add fd %d to KVM VFIO device",
fd);
return -errno;
}
#endif
return 0;
}
int vfio_kvm_device_del_fd(int fd, Error **errp)
{
#ifdef CONFIG_KVM
struct kvm_device_attr attr = {
.group = KVM_DEV_VFIO_FILE,
.attr = KVM_DEV_VFIO_FILE_DEL,
.addr = (uint64_t)(unsigned long)&fd,
};
if (vfio_kvm_device_fd < 0) {
error_setg(errp, "KVM VFIO device isn't created yet");
return -EINVAL;
}
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
error_setg_errno(errp, errno,
"Failed to remove fd %d from KVM VFIO device", fd);
return -errno;
}
#endif
return 0;
}
struct vfio_device_info *vfio_get_device_info(int fd)
{
struct vfio_device_info *info;
uint32_t argsz = sizeof(*info);
info = g_malloc0(argsz);
retry:
info->argsz = argsz;
if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
g_free(info);
return NULL;
}
if (info->argsz > argsz) {
argsz = info->argsz;
info = g_realloc(info, argsz);
goto retry;
}
return info;
}
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