Re: [Xen-devel] [PATCH v4 13/24] arm/acpi: Map all other tables for Dom0

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

On 2016/2/29 22:15, Stefano Stabellini wrote:
> On Sun, 28 Feb 2016, Shannon Zhao wrote:
>> > From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>> > 
>> > Map all other tables to Dom0 using 1:1 mappings.
>> > 
>> > Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>> > ---
>> > v4: fix commit message
>> > ---
>> >  xen/arch/arm/domain_build.c | 26 ++++++++++++++++++++++++++
>> >  1 file changed, 26 insertions(+)
>> > 
>> > diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>> > index 64e48ae..6ad420c 100644
>> > --- a/xen/arch/arm/domain_build.c
>> > +++ b/xen/arch/arm/domain_build.c
>> > @@ -1357,6 +1357,30 @@ static int prepare_dtb(struct domain *d, struct 
>> > kernel_info *kinfo)
>> >  }
>> >  
>> >  #ifdef CONFIG_ACPI
>> > +static void acpi_map_other_tables(struct domain *d)
>> > +{
>> > +    int i;
>> > +    unsigned long res;
>> > +    u64 addr, size;
>> > +
>> > +    /* Map all other tables to Dom0 using 1:1 mappings. */
>> > +    for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
>> > +    {
>> > +        addr = acpi_gbl_root_table_list.tables[i].address;
>> > +        size = acpi_gbl_root_table_list.tables[i].length;
>> > +        res = map_regions(d,
>> > +                          paddr_to_pfn(addr & PAGE_MASK),
>> > +                          DIV_ROUND_UP(size, PAGE_SIZE),
>> > +                          paddr_to_pfn(addr & PAGE_MASK));
>> > +        if ( res )
>> > +        {
>> > +             panic(XENLOG_ERR "Unable to map 0x%"PRIx64
>> > +                   " - 0x%"PRIx64" in domain \n",
>> > +                   addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1);
>> > +        }
>> > +    }
>> > +}
> The problem with this function is that it is mapping all other tables to
> the guest, including the unmodified FADT and MADT. This way dom0 is
> going to find two different versions of the FADT and MADT, isn't that
> right?
>  
We've replaced the entries of XSDT table with new value. That means XSDT
points to new table. Guest will not see the old ones.

Thanks,
-- 
Shannon


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