Re: [Xen-devel] Re: cs 23453:4f4970d2848d beaks Win 7

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 09/01/11 17:05, Ian Campbell wrote:
> The issue with 23453:4f4970d2848d is that it uses madt_csum_addr and
> madt_lapic0_addr to initialise bios_info before they have themselves
> been initialised.
>
> But in xen-unstable.hg tip everything has moved around and the issue now
> turns out to be that we clear the acpi_info struct _after_ we've setup
> the madt_* fields. Ooops!
>
> Thanks for reporting.
>
> Cheers,
> Ian.
I successfully tested your patch with Windows 7 (both 32bit and 64bit).
Windows 7 can initialize its CPUs and no longer crashes on shutdown.
Thanks for fixing. Please apply the fix.

Tested-and-acked-by: Christoph Egger <Christoph.Egger@xxxxxxx>

Christoph


> # HG changeset patch
> # User Ian Campbell<ian.campbell@xxxxxxxxxx>
> # Date 1314889401 -3600
> # Node ID bb97bd46df6c6d8562759a964ebf6c31b6361a7a
> # Parent  85b29185c9119ff9139596251d7bd13586853994
> hvmloader: don't clear acpi_info after filling in some fields
>
> In particular the madt_lapic0_addr and madt_csum_addr fields are
> filled in while building the tables.
>
> This fixes a bluescreen on shutdown with certain versions of Windows.
>
> Signed-off-by: Ian Campbell<ian.campbell@xxxxxxxxxx>
> Reported-by: Christoph Egger<Christoph.Egger@xxxxxxx>
>
> diff -r 85b29185c911 -r bb97bd46df6c tools/firmware/hvmloader/acpi/build.c
> --- a/tools/firmware/hvmloader/acpi/build.c     Thu Sep 01 09:39:25 2011 +0100
> +++ b/tools/firmware/hvmloader/acpi/build.c     Thu Sep 01 16:03:21 2011 +0100
> @@ -277,6 +277,8 @@ void acpi_build_tables(unsigned int phys
>       unsigned long        secondary_tables[16];
>       int                  nr_secondaries, i;
>
> +    memset(acpi_info, 0, sizeof(*acpi_info));
> +
>       /*
>        * Fill in high-memory data structures, starting at @buf.
>        */
> @@ -375,7 +377,6 @@ void acpi_build_tables(unsigned int phys
>                    offsetof(struct acpi_20_rsdp, extended_checksum),
>                    sizeof(struct acpi_20_rsdp));
>
> -    memset(acpi_info, 0, sizeof(*acpi_info));
>       acpi_info->com1_present = uart_exists(0x3f8);
>       acpi_info->com2_present = uart_exists(0x2f8);
>       acpi_info->lpt1_present = lpt_exists(0x378);



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