On 14/11/2011 19:25, "Julian Pidancet" <julian.pidancet@xxxxxxxxx> wrote:
> On Mon, Nov 14, 2011 at 1:23 PM, Keir Fraser <keir@xxxxxxx> wrote:
>> On 14/11/2011 08:53, "Keir Fraser" <keir.xen@xxxxxxxxx> wrote:
>>
>>> On 14/11/2011 03:36, "Kevin O'Connor" <kevin@xxxxxxxxxxxx> wrote:
>>>
>>>> On Xen, the PCI init code isn't used, so assuming this struct doesn't
>>>> need to live in real "ram", I think it could live just about anywhere
>>>> past the end of ram. Even with pciinit.c, addresses over 0xfc00000
>>>> (with the exception of a few bytes for hpet, apic, ioapic, and bios
>>>> image) could be used.
>>>
>>> I suggest we stick it at FC000000, and shift hvmloader's mem_alloc()
>>> starting address up by one page to FC001000. The acpi build code will have
>>> to manually mem_hole_populate_ram() that one page before writing to it. This
>>> can then be documented in hvmloader/config.h which contains a description
>>> of, and defines for, the system memory map. This is by far the easiest
>>> solution to this problem; manually crafting an SSDT is a right pain in the
>>> arse, whereas this is maybe a 5-line patch.
>>
>> Like the attached patch (untested), which is a bit larger than anticipated,
>> but actually allows code to be net deleted. :-)
>>
>
> I just tested your patch with Windows 7 and Linux guest booted from iPXE.
>
> Everything seems to work fine. SeaBIOS reports the following e820:
>
> (XEN) HVM23: e820 map has 6 items:
> (XEN) HVM23: 0: 0000000000000000 - 000000000009f400 = 1 RAM
> (XEN) HVM23: 1: 000000000009f400 - 00000000000a0000 = 2 RESERVED
> (XEN) HVM23: 2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
> (XEN) HVM23: 3: 0000000000100000 - 000000003f7ff000 = 1 RAM
> (XEN) HVM23: 4: 000000003f7ff000 - 000000003f800000 = 2 RESERVED
> (XEN) HVM23: 5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
>
> The ACPI code in Linux reports the right PCI memory window:
>
> [ 0.338966] PCI: Using host bridge windows from ACPI; if necessary,
> use "pci=nocrs" and report a bug
> [ 0.340000] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
> [ 0.341029] pci_root PNP0A03:00: host bridge window [io 0x0000-0x0cf7]
> [ 0.341965] pci_root PNP0A03:00: host bridge window [io 0x0d00-0xffff]
> [ 0.342965] pci_root PNP0A03:00: host bridge window [mem
> 0x000a0000-0x000bffff]
> [ 0.343965] pci_root PNP0A03:00: host bridge window [mem
> 0xf0000000-0xfbffffff]
>
> Can you ship it ?
Done. Xen-unstable:24143
Thanks,
Keir
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