[Qemu-devel] [PATCH] qxl: Only emit QXL_INTERRUPT_CLIENT_MONITORS_CONFIG on config changes

[Qemu-devel] [PATCH] qxl: Only emit QXL_INTERRUPT_CLIENT_MONITORS_CONFIG on config changes

[Christophe Fergeau]

Currently if the client keeps sending the same monitor config to
QEMU/spice-server, QEMU will always raise
a QXL_INTERRUPT_CLIENT_MONITORS_CONFIG regardless of whether there was a
change or not.
Guest-side (with fedora 25), the kernel QXL KMS driver will also forward the
event to user-space without checking if there were actual changes.
Next in line are gnome-shell/mutter (on a default f25 install), which
will try to reconfigure everything without checking if there is anything
to do.
Where this gets ugly is that when applying the resolution changes,
gnome-shell/mutter will call drmModeRmFB, drmModeAddFB, and
drmModeSetCrtc, which will cause the primary surface to be destroyed and
recreated by the QXL KMS driver. This in turn will cause the client to
resend a client monitors config message, which will cause QEMU to reemit
an interrupt with an unchanged monitors configuration, ...
This causes https://bugzilla.redhat.com/show_bug.cgi?id=1266484

This commit makes sure that we only emit
QXL_INTERRUPT_CLIENT_MONITORS_CONFIG when there are actual configuration
changes the guest should act on.
---
 hw/display/qxl.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 0e2682d..56759f8 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1000,6 +1000,7 @@ static int interface_client_monitors_config(QXLInstance *sin,
     QXLRom *rom = memory_region_get_ram_ptr(&qxl->rom_bar);
     int i;
     unsigned max_outputs = ARRAY_SIZE(rom->client_monitors_config.heads);
+    bool config_changed = false;
 
     if (qxl->revision < 4) {
         trace_qxl_client_monitors_config_unsupported_by_device(qxl->id,
@@ -1030,6 +1031,21 @@ static int interface_client_monitors_config(QXLInstance *sin,
     }
 #endif
 
+    if (rom->client_monitors_config.count != MIN(monitors_config->num_of_monitors, max_outputs)) {
+        config_changed = true;
+    }
+    for (i = 0 ; i < rom->client_monitors_config.count ; ++i) {
+        VDAgentMonConfig *monitor = &monitors_config->monitors[i];
+        QXLURect *rect = &rom->client_monitors_config.heads[i];
+        /* monitor->depth ignored */
+        if ((rect->left != monitor->x) ||
+            (rect->top != monitor->y)  ||
+            (rect->right != monitor->x + monitor->width) ||
+            (rect->bottom != monitor->y + monitor->height)) {
+            config_changed = true;
+        }
+    }
+
     memset(&rom->client_monitors_config, 0,
            sizeof(rom->client_monitors_config));
     rom->client_monitors_config.count = monitors_config->num_of_monitors;
@@ -1059,7 +1075,9 @@ static int interface_client_monitors_config(QXLInstance *sin,
     trace_qxl_interrupt_client_monitors_config(qxl->id,
                         rom->client_monitors_config.count,
                         rom->client_monitors_config.heads);
-    qxl_send_events(qxl, QXL_INTERRUPT_CLIENT_MONITORS_CONFIG);
+    if (config_changed) {
+        qxl_send_events(qxl, QXL_INTERRUPT_CLIENT_MONITORS_CONFIG);
+    }
     return 1;
 }
 
-- 
2.9.3

Re: [Qemu-devel] [PATCH] qxl: Only emit QXL_INTERRUPT_CLIENT_MONITORS_CONFIG on config changes

[no-reply]

Hi,

Your series seems to have some coding style problems. See output below for
more information:

Type: series
Subject: [Qemu-devel] [PATCH] qxl: Only emit QXL_INTERRUPT_CLIENT_MONITORS_CONFIG on config changes
Message-id: 20161028122822.18920-1-cfergeau@redhat.com

=== TEST SCRIPT BEGIN ===
#!/bin/bash

BASE=base
n=1
total=$(git log --oneline $BASE.. | wc -l)
failed=0

# Useful git options
git config --local diff.renamelimit 0
git config --local diff.renames True

commits="$(git log --format=%H --reverse $BASE..)"
for c in $commits; do
    echo "Checking PATCH $n/$total: $(git show --no-patch --format=%s $c)..."
    if ! git show $c --format=email | ./scripts/checkpatch.pl --mailback -; then
        failed=1
        echo
    fi
    n=$((n+1))
done

exit $failed
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
Switched to a new branch 'test'
d1e9838 qxl: Only emit QXL_INTERRUPT_CLIENT_MONITORS_CONFIG on config changes

=== OUTPUT BEGIN ===
fatal: unrecognized argument: --no-patch
Checking PATCH 1/1: ...
ERROR: line over 90 characters
#45: FILE: hw/display/qxl.c:1034:
+    if (rom->client_monitors_config.count != MIN(monitors_config->num_of_monitors, max_outputs)) {

ERROR: Missing Signed-off-by: line(s)

total: 2 errors, 0 warnings, 38 lines checked

Your patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

=== OUTPUT END ===

Test command exited with code: 1


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