Searched hist:"5 a2223ca26b1a34e131b5b9a63599d9426d2c25c" (Results 1 – 2 of 2) sorted by relevance
| /openbmc/qemu/include/hw/acpi/ |
| H A D | pcihp.h | diff 5a2223ca26b1a34e131b5b9a63599d9426d2c25c Sun Jan 26 04:31:27 CST 2014 Michael S. Tsirkin <mst@redhat.com> pcihp: reduce number of device check events
PIIX created a made-up value for the UP register since it was read by
guest 32 times for each interrupt.
There's no reason to do this for the new PCIHP: register is only read
once for each interrupt, so clean up code by making read act as an
interrupt acknowledgement: the new UP register clear on read.
In this way we cut down the number of bus rescans
by a factor of 32, and drop a bunch of code that's
now unused.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
| /openbmc/qemu/hw/acpi/ |
| H A D | pcihp.c | diff 5a2223ca26b1a34e131b5b9a63599d9426d2c25c Sun Jan 26 04:31:27 CST 2014 Michael S. Tsirkin <mst@redhat.com> pcihp: reduce number of device check events
PIIX created a made-up value for the UP register since it was read by
guest 32 times for each interrupt.
There's no reason to do this for the new PCIHP: register is only read
once for each interrupt, so clean up code by making read act as an
interrupt acknowledgement: the new UP register clear on read.
In this way we cut down the number of bus rescans
by a factor of 32, and drop a bunch of code that's
now unused.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|