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qemu/hw/xen
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Anthony PERARD 705be57094 xen-bus: Avoid rewriting identical values to xenstore 
When QEMU receives a xenstore watch event suggesting that the "state"
of the frontend changed, it records this in its own state but it also
re-write the value back into xenstore even so there were no change.
This triggers an unnecessary xenstore watch event which QEMU will
process again (and maybe the frontend as well). Also QEMU could
potentially write an already old value.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Message-Id: <20190823101534.465-3-anthony.perard@citrix.com>
2019-08-27 14:18:28 +01:00
..
Makefile.objs xen: add a mechanism to automatically create XenDevice-s... 2019-01-14 13:45:40 +00:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
xen_devconfig.c Include sysemu/sysemu.h a lot less 2019-08-16 13:31:53 +02:00
xen_pt_config_init.c xen: re-name XenDevice to XenLegacyDevice... 2019-01-14 13:45:40 +00:00
xen_pt_graphics.c xen: re-name XenDevice to XenLegacyDevice... 2019-01-14 13:45:40 +00:00
xen_pt_load_rom.c Clean up inclusion of sysemu/sysemu.h 2019-08-16 13:31:53 +02:00
xen_pt_msi.c xen: re-name XenDevice to XenLegacyDevice... 2019-01-14 13:45:40 +00:00
xen_pt.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
xen_pt.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
xen_pvdev.c Include qemu/main-loop.h less 2019-08-16 13:31:52 +02:00
xen-backend.c xen: add a mechanism to automatically create XenDevice-s... 2019-01-14 13:45:40 +00:00
xen-bus-helper.c Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
xen-bus.c xen-bus: Avoid rewriting identical values to xenstore 2019-08-27 14:18:28 +01:00
xen-common.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
xen-host-pci-device.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
xen-host-pci-device.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
xen-legacy-backend.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00