On Fri, Apr 20, 2018 at 03:57:19PM +0100, Roger Pau Monne wrote: > PVH guests with 4GB of RAM or more get a memory map like the > following: > > 0x00000000000000 - 0x000000fee00000 RAM > 0x000000fee00000 - 0x00000100000000 RESERVED > 0x000000fc009000 - 0x000000fc009040 ACPI > 0x000000fc000000 - 0x000000fc001000 ACPI > 0x000000fc001000 - 0x000000fc009000 ACPI > 0x00000100000000 - 0x000001fb200400 RAM > > This is wrong because ACPI regions overlap with RAM regions. The cause > of this issue is not setting a big enough MMIO hole and marking the > whole MMIO hole as reserved, when it actually contains several pieces: > > - local APIC page. > - ACPI tables. > - HVM special pages. > > Of those items only HVM special pages need to be marked as reserved in > order to advise the guest against using them for example for memory > hotplug. > > After the fix the layout reported for the same guest is: > > 0x00000000000000 - 0x000000fc000000 RAM > 0x000000feff8000 - 0x000000ff000000 RESERVED > 0x000000fc009000 - 0x000000fc009040 ACPI > 0x000000fc000000 - 0x000000fc001000 ACPI > 0x000000fc001000 - 0x000000fc009000 ACPI > 0x00000100000000 - 0x000001fe000400 RAM > > Signed-off-by: Roger Pau Monné <[email protected]>
Acked-by: Wei Liu <[email protected]> _______________________________________________ Xen-devel mailing list [email protected] https://lists.xenproject.org/mailman/listinfo/xen-devel
