cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

win32-aio.c (6017B)


      1/*
      2 * Block driver for RAW files (win32)
      3 *
      4 * Copyright (c) 2006 Fabrice Bellard
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "qemu/timer.h"
     27#include "block/block_int.h"
     28#include "block/aio.h"
     29#include "block/raw-aio.h"
     30#include "qemu/event_notifier.h"
     31#include "qemu/iov.h"
     32#include <windows.h>
     33#include <winioctl.h>
     34
     35#define FTYPE_FILE 0
     36#define FTYPE_CD     1
     37#define FTYPE_HARDDISK 2
     38
     39struct QEMUWin32AIOState {
     40    HANDLE hIOCP;
     41    EventNotifier e;
     42    int count;
     43    AioContext *aio_ctx;
     44};
     45
     46typedef struct QEMUWin32AIOCB {
     47    BlockAIOCB common;
     48    struct QEMUWin32AIOState *ctx;
     49    int nbytes;
     50    OVERLAPPED ov;
     51    QEMUIOVector *qiov;
     52    void *buf;
     53    bool is_read;
     54    bool is_linear;
     55} QEMUWin32AIOCB;
     56
     57/*
     58 * Completes an AIO request (calls the callback and frees the ACB).
     59 */
     60static void win32_aio_process_completion(QEMUWin32AIOState *s,
     61    QEMUWin32AIOCB *waiocb, DWORD count)
     62{
     63    int ret;
     64    s->count--;
     65
     66    if (waiocb->ov.Internal != 0) {
     67        ret = -EIO;
     68    } else {
     69        ret = 0;
     70        if (count < waiocb->nbytes) {
     71            /* Short reads mean EOF, pad with zeros. */
     72            if (waiocb->is_read) {
     73                qemu_iovec_memset(waiocb->qiov, count, 0,
     74                    waiocb->qiov->size - count);
     75            } else {
     76                ret = -EINVAL;
     77            }
     78       }
     79    }
     80
     81    if (!waiocb->is_linear) {
     82        if (ret == 0 && waiocb->is_read) {
     83            QEMUIOVector *qiov = waiocb->qiov;
     84            iov_from_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
     85        }
     86        qemu_vfree(waiocb->buf);
     87    }
     88
     89    waiocb->common.cb(waiocb->common.opaque, ret);
     90    qemu_aio_unref(waiocb);
     91}
     92
     93static void win32_aio_completion_cb(EventNotifier *e)
     94{
     95    QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
     96    DWORD count;
     97    ULONG_PTR key;
     98    OVERLAPPED *ov;
     99
    100    event_notifier_test_and_clear(&s->e);
    101    while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) {
    102        QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov);
    103
    104        win32_aio_process_completion(s, waiocb, count);
    105    }
    106}
    107
    108static const AIOCBInfo win32_aiocb_info = {
    109    .aiocb_size         = sizeof(QEMUWin32AIOCB),
    110};
    111
    112BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
    113        QEMUWin32AIOState *aio, HANDLE hfile,
    114        uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
    115        BlockCompletionFunc *cb, void *opaque, int type)
    116{
    117    struct QEMUWin32AIOCB *waiocb;
    118    DWORD rc;
    119
    120    waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
    121    waiocb->nbytes = bytes;
    122    waiocb->qiov = qiov;
    123    waiocb->is_read = (type == QEMU_AIO_READ);
    124
    125    if (qiov->niov > 1) {
    126        waiocb->buf = qemu_try_blockalign(bs, qiov->size);
    127        if (waiocb->buf == NULL) {
    128            goto out;
    129        }
    130        if (type & QEMU_AIO_WRITE) {
    131            iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
    132        }
    133        waiocb->is_linear = false;
    134    } else {
    135        waiocb->buf = qiov->iov[0].iov_base;
    136        waiocb->is_linear = true;
    137    }
    138
    139    memset(&waiocb->ov, 0, sizeof(waiocb->ov));
    140    waiocb->ov.Offset = (DWORD)offset;
    141    waiocb->ov.OffsetHigh = (DWORD)(offset >> 32);
    142    waiocb->ov.hEvent = event_notifier_get_handle(&aio->e);
    143
    144    aio->count++;
    145
    146    if (type & QEMU_AIO_READ) {
    147        rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
    148    } else {
    149        rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
    150    }
    151    if(rc == 0 && GetLastError() != ERROR_IO_PENDING) {
    152        goto out_dec_count;
    153    }
    154    return &waiocb->common;
    155
    156out_dec_count:
    157    aio->count--;
    158out:
    159    qemu_aio_unref(waiocb);
    160    return NULL;
    161}
    162
    163int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
    164{
    165    if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) {
    166        return -EINVAL;
    167    } else {
    168        return 0;
    169    }
    170}
    171
    172void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
    173                                  AioContext *old_context)
    174{
    175    aio_set_event_notifier(old_context, &aio->e, false, NULL, NULL);
    176    aio->aio_ctx = NULL;
    177}
    178
    179void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
    180                                  AioContext *new_context)
    181{
    182    aio->aio_ctx = new_context;
    183    aio_set_event_notifier(new_context, &aio->e, false,
    184                           win32_aio_completion_cb, NULL);
    185}
    186
    187QEMUWin32AIOState *win32_aio_init(void)
    188{
    189    QEMUWin32AIOState *s;
    190
    191    s = g_malloc0(sizeof(*s));
    192    if (event_notifier_init(&s->e, false) < 0) {
    193        goto out_free_state;
    194    }
    195
    196    s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
    197    if (s->hIOCP == NULL) {
    198        goto out_close_efd;
    199    }
    200
    201    return s;
    202
    203out_close_efd:
    204    event_notifier_cleanup(&s->e);
    205out_free_state:
    206    g_free(s);
    207    return NULL;
    208}
    209
    210void win32_aio_cleanup(QEMUWin32AIOState *aio)
    211{
    212    assert(!aio->aio_ctx);
    213    CloseHandle(aio->hIOCP);
    214    event_notifier_cleanup(&aio->e);
    215    g_free(aio);
    216}