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Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram |
Date: |
Mon, 20 Jan 2014 17:51:47 +0200 |
On Mon, Jan 20, 2014 at 04:36:57PM +0100, Gerd Hoffmann wrote:
> > 4.1.2.
> > MCFG Table Description
> >
> >
> > ...
> >
> > If the operating system does not natively comprehend reserving the MMCFG
> > region, the MMCFG region must be reserved by firmware. The address range
> > reported in the MCFG table or by _CBA method (see Section 4.1.3) must be
> > reserved by declaring a motherboard resource.
>
> We don't do this today.
>
> > For most systems, the
> > motherboard resource would appear at the root of the ACPI namespace
> > (under \_SB) in a node with a _HID of EISAID (PNP0C02), and the
> > resources in this case should not be claimed in the root PCI bus’s _CRS.
>
> Which I read as _in case it is at the root of the apci namespace_ it
> should not be claimed in PCI0._CRS. Which makes sense.
>
> My laptop has it reserved in a \_SB\PCI0\LPC\SIO device instead:
>
> Device (LPC)
> {
> Name (_ADR, 0x001F0000) // _ADR: Address
> Name (_S3D, 0x03) // _S3D: S3 Device State
> Name (RID, 0x00)
> Device (SIO)
> {
> Name (_HID, EisaId ("PNP0C02"))
> Name (_UID, 0x00) // _UID: Unique ID
> Name (SCRS, ResourceTemplate ()
> {
> [ ... ]
> Memory32Fixed (ReadWrite,
> 0xF8000000, // Address Base
> 0x04000000, // Address Length
> )
> [ ... ]
>
> cheers,
> Gerd
>
We can try, but Igor tried to do something like this recently (
for IO resources) and windows guests kept crashing
unless he made holes in _CRS.
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Igor Mammedov, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/21