static void whpx_process_section(MemoryRegionSection *section, int add) { MemoryRegion *mr = section->mr; hwaddr start_pa = section->offset_within_address_space; ram_addr_t size = int128_get64(section->size); unsigned int delta; uint64_t host_va; if (!memory_region_is_ram(mr)) { return; } delta = qemu_real_host_page_size - (start_pa & ~qemu_real_host_page_mask); delta &= ~qemu_real_host_page_mask; if (delta > size) { return; } start_pa += delta; size -= delta; size &= qemu_real_host_page_mask; if (!size || (start_pa & ~qemu_real_host_page_mask)) { return; } host_va = (uintptr_t)memory_region_get_ram_ptr(mr) + section->offset_within_region + delta; whpx_update_mapping(start_pa, size, (void *)host_va, add, memory_region_is_rom(mr), mr->name); }
static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) { VirtIOBalloon *s = VIRTIO_BALLOON(vdev); VirtQueueElement *elem; MemoryRegionSection section; for (;;) { size_t offset = 0; uint32_t pfn; elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { return; } while (iov_to_buf(elem->out_sg, elem->out_num, offset, &pfn, 4) == 4) { hwaddr pa; int p = virtio_ldl_p(vdev, &pfn); pa = (hwaddr) p << VIRTIO_BALLOON_PFN_SHIFT; offset += 4; section = memory_region_find(get_system_memory(), pa, BALLOON_PAGE_SIZE); if (!section.mr) { trace_virtio_balloon_bad_addr(pa); continue; } if (!memory_region_is_ram(section.mr) || memory_region_is_rom(section.mr) || memory_region_is_romd(section.mr)) { trace_virtio_balloon_bad_addr(pa); memory_region_unref(section.mr); continue; } trace_virtio_balloon_handle_output(memory_region_name(section.mr), pa); if (!qemu_balloon_is_inhibited()) { if (vq == s->ivq) { balloon_inflate_page(s, section.mr, section.offset_within_region); } else if (vq == s->dvq) { balloon_deflate_page(s, section.mr, section.offset_within_region); } else { g_assert_not_reached(); } } memory_region_unref(section.mr); } virtqueue_push(vq, elem, offset); virtio_notify(vdev, vq); g_free(elem); } }
static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) { VirtIOBalloon *s = VIRTIO_BALLOON(vdev); VirtQueueElement *elem; MemoryRegionSection section; for (;;) { size_t offset = 0; uint32_t pfn; elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { return; } while (iov_to_buf(elem->out_sg, elem->out_num, offset, &pfn, 4) == 4) { ram_addr_t pa; ram_addr_t addr; int p = virtio_ldl_p(vdev, &pfn); pa = (ram_addr_t) p << VIRTIO_BALLOON_PFN_SHIFT; offset += 4; /* FIXME: remove get_system_memory(), but how? */ section = memory_region_find(get_system_memory(), pa, 1); if (!int128_nz(section.size) || !memory_region_is_ram(section.mr) || memory_region_is_rom(section.mr) || memory_region_is_romd(section.mr)) { trace_virtio_balloon_bad_addr(pa); memory_region_unref(section.mr); continue; } trace_virtio_balloon_handle_output(memory_region_name(section.mr), pa); /* Using memory_region_get_ram_ptr is bending the rules a bit, but should be OK because we only want a single page. */ addr = section.offset_within_region; balloon_page(memory_region_get_ram_ptr(section.mr) + addr, !!(vq == s->dvq)); memory_region_unref(section.mr); } virtqueue_push(vq, elem, offset); virtio_notify(vdev, vq); g_free(elem); } }