https://bugzilla.kernel.org/show_bug.cgi?id=102391
Bug ID: 102391
Summary: Consult MTRRs to determine memory type outside of EFI
memory map
Product: ACPI
Version: 2.5
Kernel Version: all before 4.2
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Other
Assignee: acpi_config-ot...@kernel-bugs.osdl.org
Reporter: l...@kernel.org
Regression: No
For memory that is not reported by EFI memory map
but may be referenced in an ACPI op-region...
Linux uses the default cache-able memory type:
However, this may not always be correct --
the memory may be non-cached.
Linux needs to consult the MTRRs to
get the type correct always.
There is a proposal to update the ACPI spec to emphasize
that an 'architecture specific method' should be consulted
to determine memory type (ARM and x86 have different methods).
But Windows already does this, and so it is likely that this
is behind failures in Linux today.
--
You are receiving this mail because:
You are watching the assignee of the bug.
------------------------------------------------------------------------------
_______________________________________________
acpi-bugzilla mailing list
acpi-bugzilla@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
