mirror of https://gitlab.com/qemu-project/qemu
140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/*
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* DMA memory preregistration
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*
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* Authors:
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* Alexey Kardashevskiy <aik@ozlabs.ru>
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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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#include "qemu/osdep.h"
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#include "cpu.h"
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#include <sys/ioctl.h>
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#include <linux/vfio.h>
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#include "hw/vfio/vfio-common.h"
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#include "hw/hw.h"
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#include "qemu/error-report.h"
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#include "trace.h"
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static bool vfio_prereg_listener_skipped_section(MemoryRegionSection *section)
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{
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if (memory_region_is_iommu(section->mr)) {
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hw_error("Cannot possibly preregister IOMMU memory");
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}
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return !memory_region_is_ram(section->mr) ||
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memory_region_is_skip_dump(section->mr);
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}
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static void *vfio_prereg_gpa_to_vaddr(MemoryRegionSection *section, hwaddr gpa)
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{
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return memory_region_get_ram_ptr(section->mr) +
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section->offset_within_region +
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(gpa - section->offset_within_address_space);
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}
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static void vfio_prereg_listener_region_add(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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VFIOContainer *container = container_of(listener, VFIOContainer,
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prereg_listener);
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const hwaddr gpa = section->offset_within_address_space;
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hwaddr end;
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int ret;
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hwaddr page_mask = qemu_real_host_page_mask;
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struct vfio_iommu_spapr_register_memory reg = {
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.argsz = sizeof(reg),
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.flags = 0,
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};
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if (vfio_prereg_listener_skipped_section(section)) {
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trace_vfio_prereg_listener_region_add_skip(
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section->offset_within_address_space,
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section->offset_within_address_space +
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int128_get64(int128_sub(section->size, int128_one())));
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return;
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}
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if (unlikely((section->offset_within_address_space & ~page_mask) ||
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(section->offset_within_region & ~page_mask) ||
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(int128_get64(section->size) & ~page_mask))) {
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error_report("%s received unaligned region", __func__);
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return;
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}
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end = section->offset_within_address_space + int128_get64(section->size);
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if (gpa >= end) {
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return;
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}
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memory_region_ref(section->mr);
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reg.vaddr = (uintptr_t) vfio_prereg_gpa_to_vaddr(section, gpa);
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reg.size = end - gpa;
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ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_REGISTER_MEMORY, ®);
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trace_vfio_prereg_register(reg.vaddr, reg.size, ret ? -errno : 0);
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if (ret) {
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/*
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* On the initfn path, store the first error in the container so we
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* can gracefully fail. Runtime, there's not much we can do other
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* than throw a hardware error.
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*/
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if (!container->initialized) {
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if (!container->error) {
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container->error = ret;
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}
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} else {
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hw_error("vfio: Memory registering failed, unable to continue");
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}
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}
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}
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static void vfio_prereg_listener_region_del(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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VFIOContainer *container = container_of(listener, VFIOContainer,
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prereg_listener);
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const hwaddr gpa = section->offset_within_address_space;
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hwaddr end;
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int ret;
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hwaddr page_mask = qemu_real_host_page_mask;
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struct vfio_iommu_spapr_register_memory reg = {
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.argsz = sizeof(reg),
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.flags = 0,
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};
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if (vfio_prereg_listener_skipped_section(section)) {
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trace_vfio_prereg_listener_region_del_skip(
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section->offset_within_address_space,
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section->offset_within_address_space +
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int128_get64(int128_sub(section->size, int128_one())));
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return;
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}
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if (unlikely((section->offset_within_address_space & ~page_mask) ||
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(section->offset_within_region & ~page_mask) ||
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(int128_get64(section->size) & ~page_mask))) {
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error_report("%s received unaligned region", __func__);
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return;
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}
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end = section->offset_within_address_space + int128_get64(section->size);
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if (gpa >= end) {
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return;
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}
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reg.vaddr = (uintptr_t) vfio_prereg_gpa_to_vaddr(section, gpa);
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reg.size = end - gpa;
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ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY, ®);
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trace_vfio_prereg_unregister(reg.vaddr, reg.size, ret ? -errno : 0);
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}
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const MemoryListener vfio_prereg_listener = {
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.region_add = vfio_prereg_listener_region_add,
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.region_del = vfio_prereg_listener_region_del,
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};
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