Re: [Xen-devel] [PATCH RFC v1 28/74] x86: initialise shared_info page

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 05/01/18 14:11, Jan Beulich wrote:
>>>> On 04.01.18 at 14:05, <wei.liu2@xxxxxxxxxx> wrote:
>> --- a/xen/arch/x86/guest/xen.c
>> +++ b/xen/arch/x86/guest/xen.c
>> @@ -72,6 +72,30 @@ void __init probe_hypervisor(void)
>>      xen_guest = true;
>>  }
>>  
>> +static void map_shared_info(struct e820map *e820)
>> +{
>> +    paddr_t frame = 0xff000000; /* TODO: Hardcoded beside magic frames. */
> What are the plans here?

Nothing immediately.  This is compatible with all versions of libxc in
existance, but we need to start a thread discussing HVM guest physical
address space.

We've also just found a passive performance hole, where enabling any
kind of PCI Passthrough causes Windows and Linux's grant table mappings
to turn uncached because they are allocated inside what the OS thinks is
an MMIO BAR.

I'll start a thread when I'm a little less busy.

~Andrew

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