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vnc dirty tracking optinizations.

Browse source 
various vnc bugfixes.
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Merge remote-tracking branch 'remotes/kraxel/tags/pull-vnc-1' into staging

vnc dirty tracking optinizations.
various vnc bugfixes.

# gpg: Signature made Mon 10 Mar 2014 12:39:54 GMT using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-vnc-1:
  ui/vnc: disable adaptive update calculations if not needed
  ui/vnc: optimize setting in vnc_dpy_update()
  ui/vnc: optimize clearing in find_and_clear_dirty_height()
  ui/vnc: optimize dirty bitmap tracking
  ui/vnc: derive cmp_bytes from VNC_DIRTY_PIXELS_PER_BIT
  ui/vnc: introduce VNC_DIRTY_PIXELS_PER_BIT macro
  vnc: fix use-after-free in vnc_update_client_sync
  vnc: Fix qemu crashed when vnc client disconnect suddenly
  vnc: Fix tight_detect_smooth_image() for lossless case

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-03-11 10:53:17 +00:00
parent 118760dfc9 e22492d332
commit fe6c53b4bb
4 changed files with 141 additions and 103 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
ui/vnc-enc-tight.c
View file

@ -330,7 +330,7 @@ tight_detect_smooth_image(VncState *vs, int w, int h)
} else {
errors = tight_detect_smooth_image16(vs, w, h);
}
if (quality != -1) {
if (quality != (uint8_t)-1) {
return (errors < tight_conf[quality].jpeg_threshold);
}
return (errors < tight_conf[compression].gradient_threshold);

5
ui/vnc-jobs.c
View file

@ -252,6 +252,8 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
if (job->vs->csock == -1) {
vnc_unlock_display(job->vs->vd);
/* Copy persistent encoding data */
vnc_async_encoding_end(job->vs, &vs);
goto disconnected;
}
@ -278,6 +280,9 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
vnc_async_encoding_end(job->vs, &vs);
qemu_bh_schedule(job->vs->bh);
} else {
/* Copy persistent encoding data */
vnc_async_encoding_end(job->vs, &vs);
}
vnc_unlock_output(job->vs);

227
ui/vnc.c
View file

@ -417,8 +417,7 @@ out_error:
3) resolutions > 1024
*/
static int vnc_update_client(VncState *vs, int has_dirty);
static int vnc_update_client_sync(VncState *vs, int has_dirty);
static int vnc_update_client(VncState *vs, int has_dirty, bool sync);
static void vnc_disconnect_start(VncState *vs);
static void vnc_colordepth(VncState *vs);
@ -431,29 +430,25 @@ static int vnc_refresh_server_surface(VncDisplay *vd);
static void vnc_dpy_update(DisplayChangeListener *dcl,
int x, int y, int w, int h)
{
int i;
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
struct VncSurface *s = &vd->guest;
int width = surface_width(vd->ds);
int height = surface_height(vd->ds);
h += y;
/* round x down to ensure the loop only spans one 16-pixel block per,
iteration. otherwise, if (x % 16) != 0, the last iteration may span
two 16-pixel blocks but we only mark the first as dirty
*/
w += (x % 16);
x -= (x % 16);
/* this is needed this to ensure we updated all affected
* blocks if x % VNC_DIRTY_PIXELS_PER_BIT != 0 */
w += (x % VNC_DIRTY_PIXELS_PER_BIT);
x -= (x % VNC_DIRTY_PIXELS_PER_BIT);
x = MIN(x, width);
y = MIN(y, height);
w = MIN(x + w, width) - x;
h = MIN(h, height);
h = MIN(y + h, height);
for (; y < h; y++)
for (i = 0; i < w; i += 16)
set_bit((x + i) / 16, s->dirty[y]);
for (; y < h; y++) {
bitmap_set(s->dirty[y], x / VNC_DIRTY_PIXELS_PER_BIT,
DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT));
}
}
void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
@ -571,6 +566,15 @@ void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y)
ptr += x * VNC_SERVER_FB_BYTES;
return ptr;
}
/* this sets only the visible pixels of a dirty bitmap */
#define VNC_SET_VISIBLE_PIXELS_DIRTY(bitmap, w, h) {\
int y;\
memset(bitmap, 0x00, sizeof(bitmap));\
for (y = 0; y < h; y++) {\
bitmap_set(bitmap[y], 0,\
DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT));\
} \
}
static void vnc_dpy_switch(DisplayChangeListener *dcl,
DisplaySurface *surface)
@ -596,7 +600,9 @@ static void vnc_dpy_switch(DisplayChangeListener *dcl,
qemu_pixman_image_unref(vd->guest.fb);
vd->guest.fb = pixman_image_ref(surface->image);
vd->guest.format = surface->format;
memset(vd->guest.dirty, 0xFF, sizeof(vd->guest.dirty));
VNC_SET_VISIBLE_PIXELS_DIRTY(vd->guest.dirty,
surface_width(vd->ds),
surface_height(vd->ds));
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_colordepth(vs);
@ -604,7 +610,9 @@ static void vnc_dpy_switch(DisplayChangeListener *dcl,
if (vs->vd->cursor) {
vnc_cursor_define(vs);
}
memset(vs->dirty, 0xFF, sizeof(vs->dirty));
VNC_SET_VISIBLE_PIXELS_DIRTY(vs->dirty,
surface_width(vd->ds),
surface_height(vd->ds));
}
}
@ -751,7 +759,7 @@ static void vnc_dpy_copy(DisplayChangeListener *dcl,
QTAILQ_FOREACH_SAFE(vs, &vd->clients, next, vn) {
if (vnc_has_feature(vs, VNC_FEATURE_COPYRECT)) {
vs->force_update = 1;
vnc_update_client_sync(vs, 1);
vnc_update_client(vs, 1, true);
/* vs might be free()ed here */
}
}
@ -770,11 +778,12 @@ static void vnc_dpy_copy(DisplayChangeListener *dcl,
y = dst_y + h - 1;
inc = -1;
}
w_lim = w - (16 - (dst_x % 16));
if (w_lim < 0)
w_lim = w - (VNC_DIRTY_PIXELS_PER_BIT - (dst_x % VNC_DIRTY_PIXELS_PER_BIT));
if (w_lim < 0) {
w_lim = w;
else
w_lim = w - (w_lim % 16);
} else {
w_lim = w - (w_lim % VNC_DIRTY_PIXELS_PER_BIT);
}
for (i = 0; i < h; i++) {
for (x = 0; x <= w_lim;
x += s, src_row += cmp_bytes, dst_row += cmp_bytes) {
@ -782,10 +791,11 @@ static void vnc_dpy_copy(DisplayChangeListener *dcl,
if ((s = w - w_lim) == 0)
break;
} else if (!x) {
s = (16 - (dst_x % 16));
s = (VNC_DIRTY_PIXELS_PER_BIT -
(dst_x % VNC_DIRTY_PIXELS_PER_BIT));
s = MIN(s, w_lim);
} else {
s = 16;
s = VNC_DIRTY_PIXELS_PER_BIT;
}
cmp_bytes = s * VNC_SERVER_FB_BYTES;
if (memcmp(src_row, dst_row, cmp_bytes) == 0)
@ -793,7 +803,8 @@ static void vnc_dpy_copy(DisplayChangeListener *dcl,
memmove(dst_row, src_row, cmp_bytes);
QTAILQ_FOREACH(vs, &vd->clients, next) {
if (!vnc_has_feature(vs, VNC_FEATURE_COPYRECT)) {
set_bit(((x + dst_x) / 16), vs->dirty[y]);
set_bit(((x + dst_x) / VNC_DIRTY_PIXELS_PER_BIT),
vs->dirty[y]);
}
}
}
@ -862,35 +873,24 @@ static int find_and_clear_dirty_height(struct VncState *vs,
int h;
for (h = 1; h < (height - y); h++) {
int tmp_x;
if (!test_bit(last_x, vs->dirty[y + h])) {
break;
}
for (tmp_x = last_x; tmp_x < x; tmp_x++) {
clear_bit(tmp_x, vs->dirty[y + h]);
}
bitmap_clear(vs->dirty[y + h], last_x, x - last_x);
}
return h;
}
static int vnc_update_client_sync(VncState *vs, int has_dirty)
{
int ret = vnc_update_client(vs, has_dirty);
vnc_jobs_join(vs);
return ret;
}
static int vnc_update_client(VncState *vs, int has_dirty)
static int vnc_update_client(VncState *vs, int has_dirty, bool sync)
{
if (vs->need_update && vs->csock != -1) {
VncDisplay *vd = vs->vd;
VncJob *job;
int y;
int width, height;
int height;
int n = 0;
if (vs->output.offset && !vs->audio_cap && !vs->force_update)
/* kernel send buffers are full -> drop frames to throttle */
return 0;
@ -906,33 +906,27 @@ static int vnc_update_client(VncState *vs, int has_dirty)
*/
job = vnc_job_new(vs);
width = MIN(pixman_image_get_width(vd->server), vs->client_width);
height = MIN(pixman_image_get_height(vd->server), vs->client_height);
for (y = 0; y < height; y++) {
int x;
int last_x = -1;
for (x = 0; x < width / 16; x++) {
if (test_and_clear_bit(x, vs->dirty[y])) {
if (last_x == -1) {
last_x = x;
}
} else {
if (last_x != -1) {
int h = find_and_clear_dirty_height(vs, y, last_x, x,
height);
n += vnc_job_add_rect(job, last_x * 16, y,
(x - last_x) * 16, h);
}
last_x = -1;
}
}
if (last_x != -1) {
int h = find_and_clear_dirty_height(vs, y, last_x, x, height);
n += vnc_job_add_rect(job, last_x * 16, y,
(x - last_x) * 16, h);
y = 0;
for (;;) {
int x, h;
unsigned long x2;
unsigned long offset = find_next_bit((unsigned long *) &vs->dirty,
height * VNC_DIRTY_BPL(vs),
y * VNC_DIRTY_BPL(vs));
if (offset == height * VNC_DIRTY_BPL(vs)) {
/* no more dirty bits */
break;
}
y = offset / VNC_DIRTY_BPL(vs);
x = offset % VNC_DIRTY_BPL(vs);
x2 = find_next_zero_bit((unsigned long *) &vs->dirty[y],
VNC_DIRTY_BPL(vs), x);
bitmap_clear(vs->dirty[y], x, x2 - x);
h = find_and_clear_dirty_height(vs, y, x, x2, height);
n += vnc_job_add_rect(job, x * VNC_DIRTY_PIXELS_PER_BIT, y,
(x2 - x) * VNC_DIRTY_PIXELS_PER_BIT, h);
}
vnc_job_push(job);
@ -940,8 +934,11 @@ static int vnc_update_client(VncState *vs, int has_dirty)
return n;
}
if (vs->csock == -1)
if (vs->csock == -1) {
vnc_disconnect_finish(vs);
} else if (sync) {
vnc_jobs_join(vs);
}
return 0;
}
@ -1846,7 +1843,7 @@ static void framebuffer_update_request(VncState *vs, int incremental,
int w, int h)
{
int i;
const size_t width = surface_width(vs->vd->ds) / 16;
const size_t width = surface_width(vs->vd->ds) / VNC_DIRTY_PIXELS_PER_BIT;
const size_t height = surface_height(vs->vd->ds);
if (y_position > height) {
@ -2548,7 +2545,9 @@ static int vnc_refresh_lossy_rect(VncDisplay *vd, int x, int y)
vs->lossy_rect[sty][stx] = 0;
for (j = 0; j < VNC_STAT_RECT; ++j) {
bitmap_set(vs->dirty[y + j], x / 16, VNC_STAT_RECT / 16);
bitmap_set(vs->dirty[y + j],
x / VNC_DIRTY_PIXELS_PER_BIT,
VNC_STAT_RECT / VNC_DIRTY_PIXELS_PER_BIT);
}
has_dirty++;
}
@ -2652,8 +2651,8 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
int width = pixman_image_get_width(vd->guest.fb);
int height = pixman_image_get_height(vd->guest.fb);
int y;
uint8_t *guest_row;
uint8_t *server_row;
uint8_t *guest_row0 = NULL, *server_row0;
int guest_stride = 0, server_stride;
int cmp_bytes;
VncState *vs;
int has_dirty = 0;
@ -2671,47 +2670,64 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
* Check and copy modified bits from guest to server surface.
* Update server dirty map.
*/
cmp_bytes = 64;
cmp_bytes = VNC_DIRTY_PIXELS_PER_BIT * VNC_SERVER_FB_BYTES;
if (cmp_bytes > vnc_server_fb_stride(vd)) {
cmp_bytes = vnc_server_fb_stride(vd);
}
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
int width = pixman_image_get_width(vd->server);
tmpbuf = qemu_pixman_linebuf_create(VNC_SERVER_FB_FORMAT, width);
} else {
guest_row0 = (uint8_t *)pixman_image_get_data(vd->guest.fb);
guest_stride = pixman_image_get_stride(vd->guest.fb);
}
guest_row = (uint8_t *)pixman_image_get_data(vd->guest.fb);
server_row = (uint8_t *)pixman_image_get_data(vd->server);
for (y = 0; y < height; y++) {
if (!bitmap_empty(vd->guest.dirty[y], VNC_DIRTY_BITS)) {
int x;
uint8_t *guest_ptr;
uint8_t *server_ptr;
server_row0 = (uint8_t *)pixman_image_get_data(vd->server);
server_stride = pixman_image_get_stride(vd->server);
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
qemu_pixman_linebuf_fill(tmpbuf, vd->guest.fb, width, 0, y);
guest_ptr = (uint8_t *)pixman_image_get_data(tmpbuf);
} else {
guest_ptr = guest_row;
}
server_ptr = server_row;
for (x = 0; x + 15 < width;
x += 16, guest_ptr += cmp_bytes, server_ptr += cmp_bytes) {
if (!test_and_clear_bit((x / 16), vd->guest.dirty[y]))
continue;
if (memcmp(server_ptr, guest_ptr, cmp_bytes) == 0)
continue;
memcpy(server_ptr, guest_ptr, cmp_bytes);
if (!vd->non_adaptive)
vnc_rect_updated(vd, x, y, &tv);
QTAILQ_FOREACH(vs, &vd->clients, next) {
set_bit((x / 16), vs->dirty[y]);
}
has_dirty++;
}
y = 0;
for (;;) {
int x;
uint8_t *guest_ptr, *server_ptr;
unsigned long offset = find_next_bit((unsigned long *) &vd->guest.dirty,
height * VNC_DIRTY_BPL(&vd->guest),
y * VNC_DIRTY_BPL(&vd->guest));
if (offset == height * VNC_DIRTY_BPL(&vd->guest)) {
/* no more dirty bits */
break;
}
guest_row += pixman_image_get_stride(vd->guest.fb);
server_row += pixman_image_get_stride(vd->server);
y = offset / VNC_DIRTY_BPL(&vd->guest);
x = offset % VNC_DIRTY_BPL(&vd->guest);
server_ptr = server_row0 + y * server_stride + x * cmp_bytes;
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
qemu_pixman_linebuf_fill(tmpbuf, vd->guest.fb, width, 0, y);
guest_ptr = (uint8_t *)pixman_image_get_data(tmpbuf);
} else {
guest_ptr = guest_row0 + y * guest_stride;
}
guest_ptr += x * cmp_bytes;
for (; x < DIV_ROUND_UP(width, VNC_DIRTY_PIXELS_PER_BIT);
x++, guest_ptr += cmp_bytes, server_ptr += cmp_bytes) {
if (!test_and_clear_bit(x, vd->guest.dirty[y])) {
continue;
}
if (memcmp(server_ptr, guest_ptr, cmp_bytes) == 0) {
continue;
}
memcpy(server_ptr, guest_ptr, cmp_bytes);
if (!vd->non_adaptive) {
vnc_rect_updated(vd, x * VNC_DIRTY_PIXELS_PER_BIT,
y, &tv);
}
QTAILQ_FOREACH(vs, &vd->clients, next) {
set_bit(x, vs->dirty[y]);
}
has_dirty++;
}
y++;
}
qemu_pixman_image_unref(tmpbuf);
return has_dirty;
@ -2734,7 +2750,7 @@ static void vnc_refresh(DisplayChangeListener *dcl)
vnc_unlock_display(vd);
QTAILQ_FOREACH_SAFE(vs, &vd->clients, next, vn) {
rects += vnc_update_client(vs, has_dirty);
rects += vnc_update_client(vs, has_dirty, false);
/* vs might be free()ed here */
}
@ -3134,7 +3150,9 @@ void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
acl = 1;
#endif
} else if (strncmp(options, "lossy", 5) == 0) {
#ifdef CONFIG_VNC_JPEG
vs->lossy = true;
#endif
} else if (strncmp(options, "non-adaptive", 12) == 0) {
vs->non_adaptive = true;
} else if (strncmp(options, "share=", 6) == 0) {
@ -3151,6 +3169,13 @@ void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
}
}
/* adaptive updates are only used with tight encoding and
* if lossy updates are enabled so we can disable all the
* calculations otherwise */
if (!vs->lossy) {
vs->non_adaptive = true;
}
#ifdef CONFIG_VNC_TLS
if (acl && x509 && vs->tls.x509verify) {
if (!(vs->tls.acl = qemu_acl_init("vnc.x509dname"))) {

10
ui/vnc.h
View file

@ -81,8 +81,16 @@ typedef void VncSendHextileTile(VncState *vs,
#define VNC_MAX_WIDTH 2560
#define VNC_MAX_HEIGHT 2048
/* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
* by one bit in the dirty bitmap */
#define VNC_DIRTY_PIXELS_PER_BIT 16
/* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / 16)
#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
/* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
* VNC_DIRTY_BITS due to alignment */
#define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
#define VNC_STAT_RECT 64
#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)