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[Qemu-block] [PATCH v2 0/2] AHCI: avoid mapping stale guest memory

From: John Snow
Subject: [Qemu-block] [PATCH v2 0/2] AHCI: avoid mapping stale guest memory
Date: Fri, 13 Mar 2015 17:50:52 -0400

Currently, the AHCI device tries to re-map guest memory every time
the low or high address registers are written to, whether or not the
AHCI device is currently active. If the other register has stale
information in it, this may lead to runtime failures.

Reconfigure the AHCI device to ignore writes to these registers while
the device is active, and otherwise postpone the dma memory map until
the device becomes active.

If the mappings should for whatever reason fail, do not activate the
bits that tell the user the device has been started successfully.

 - ahci_map_[clb|fis]_address now returns true on success
 - PORT_CMD_LIST_ON and PORT_CMD_FIS_ON only turn on if the map succeeds
 - Fix compiler warning due to changing context.

John Snow (2):
  AHCI: Do not (re)map FB/CLB buffers while not running
  AHCI: Protect cmd register

 hw/ide/ahci.c | 76 +++++++++++++++++++++++++++++++++++++++++++++--------------
 hw/ide/ahci.h |  2 ++
 2 files changed, 60 insertions(+), 18 deletions(-)


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