[Qemu-devel] [PATCH] Add new client_present and client capabilities fields to QXLRom

["Søren Sandmann Pedersen" <sandmann@cs.au.dk>]

From: Søren Sandmann Pedersen <ssp@redhat.com>

The client_present field is a byte that is set of non-zero when a
client is connected and to zero when no client is connected.

The client_capabilities[58] array contains 464 bits that indicate the
capabilities of the client. Each bit corresponds to a
SPICE_DISPLAY_CAP_* capability. In particular, if the client has
capability C, then bit (C % 8) in byte (C / 8) is set. The capability
bits only have a defined meaning when a client is connected, ie., when
client_present is non-zero. The number 58 was chosen to fill out a
cache line in QXLRom.

A new QXL_INTERRUPT_CLIENT interrupt is defined, which will be raised
whenever a client connects or disconnects.

Finally, add a new QXL_REVISION_STABLE_V13 = 0x05 constant to indicate
the presence of these new features.
---
 spice/qxl_dev.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/spice/qxl_dev.h b/spice/qxl_dev.h
index 1292767..a19cc67 100644
--- a/spice/qxl_dev.h
+++ b/spice/qxl_dev.h
@@ -49,6 +49,7 @@ enum {
     QXL_REVISION_STABLE_V06=0x02,
     QXL_REVISION_STABLE_V10=0x03,
     QXL_REVISION_STABLE_V12=0x04,
+    QXL_REVISION_STABLE_V13=0x05,
 };
 
 #define QXL_DEVICE_ID_DEVEL 0x01ff
@@ -148,7 +149,9 @@ typedef struct SPICE_ATTR_PACKED QXLRom {
     uint8_t slot_gen_bits;
     uint8_t slot_id_bits;
     uint8_t slot_generation;
-    uint8_t padding[3]; /* Padding to 32bit align */
+    /* appended for qxl-5 */
+    uint8_t client_present;
+    uint8_t client_capabilities[58];
 } QXLRom;
 
 /* qxl-1 compat: fixed */
@@ -231,6 +234,7 @@ SPICE_RING_DECLARE(QXLReleaseRing, uint64_t, QXL_RELEASE_RING_SIZE);
 #define QXL_INTERRUPT_CURSOR (1 << 1)
 #define QXL_INTERRUPT_IO_CMD (1 << 2)
 #define QXL_INTERRUPT_ERROR  (1 << 3)
+#define QXL_INTERRUPT_CLIENT (1 << 4)
 
 /* qxl-1 compat: append only */
 typedef struct SPICE_ATTR_PACKED QXLRam {
-- 
1.7.4