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ahci: advertise HOST_CAP_64

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The AHCI emulation code supports 64-bit addressing and should advertise this
fact in the Host Capabilities register. Both Linux and Windows drivers test
this bit to decide if the upper 32 bits of various registers may be written
to, and at least some versions of Windows have a bug where DMA is attempted
with an address above 4GB but, in the absence of HOST_CAP_64, the upper 32
bits are left unititialized which leads to a memory corruption.

[Maintainer edit:

This fixes https://bugzilla.redhat.com/show_bug.cgi?id=1411105,
which affects Windows Server 2008 SP2 in some cases.]

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Message-id: 1484305370-6220-1-git-send-email-lprosek@redhat.com
[Amended commit message --js]
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Ladi Prosek 2017-02-10 11:47:11 -05:00 committed by John Snow
parent 61eedf7aec
commit 98cb5dccb1
1 changed files with 1 additions and 1 deletions
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2
hw/ide/ahci.c
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@ -488,7 +488,7 @@ static void ahci_reg_init(AHCIState *s)
s->control_regs.cap = (s->ports - 1) |
(AHCI_NUM_COMMAND_SLOTS << 8) |
(AHCI_SUPPORTED_SPEED_GEN1 << AHCI_SUPPORTED_SPEED) |
HOST_CAP_NCQ | HOST_CAP_AHCI;
HOST_CAP_NCQ | HOST_CAP_AHCI | HOST_CAP_64;
s->control_regs.impl = (1 << s->ports) - 1;