Hi all
The Windows install test case has been failing reliably in OSSTest for
the last 6 runs.
The issue manifest as Windows hit blue screen with garbled text that
cannot be recognised when booting. Xen doesn't complain about any
failures.
I bisected that and found this commit is to be blamed.
commit 3bbaaec09b1b942f5624dee176da6e416d31f982
Author: Paul Durrant <paul.durr...@citrix.com>
Date: Thu Jul 9 19:04:00 2015 +0200
x86/hvm: unify stdvga mmio intercept with standard mmio intercept
It's clear from the following check in hvmemul_rep_movs:
if ( sp2mt == p2m_mmio_direct || dp2mt == p2m_mmio_direct ||
(sp2mt == p2m_mmio_dm && dp2mt == p2m_mmio_dm) )
return X86EMUL_UNHANDLEABLE;
that mmio <-> mmio copy is not handled. This means the code in the
stdvga mmio intercept that explicitly handles mmio <-> mmio copy when
hvm_copy_to/from_guest_phys() fails is never going to be executed.
This patch therefore adds a check in hvmemul_do_io_addr() to make sure
mmio <-> mmio is disallowed and then registers standard mmio intercept ops
in stdvga_init().
With this patch all mmio and portio handled within Xen now goes through
process_io_intercept().
Signed-off-by: Paul Durrant <paul.durr...@citrix.com>
Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>
Tell me if you need more information or want me to test a patch. I do
have test environment at hand.
Wei.
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