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pcihp: reduce number of device check events

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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>
This commit is contained in:
Michael S. Tsirkin 2014-01-26 12:31:27 +02:00
parent 2b2449f7e4
commit 5a2223ca26
2 changed files with 6 additions and 17 deletions
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2
include/hw/acpi/pcihp.h
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@ -32,7 +32,7 @@
#include "hw/pci/pci.h" /* for PCIHotplugState */
typedef struct AcpiPciHpPciStatus {
uint32_t up; /* deprecated, maintained for migration compatibility */
uint32_t up;
uint32_t down;
uint32_t hotplug_enable;
uint32_t device_present;