Re: [Xen-devel] [PATCH V2 7/25] tools/libacpi: Add new fields in acpi_config for DMAR table

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2017年08月22日 21:12, Wei Liu wrote:
> On Wed, Aug 09, 2017 at 04:34:08PM -0400, Lan Tianyu wrote:
>> From: Chao Gao <chao.gao@xxxxxxxxx>
>>
>> The BIOS reports the remapping hardware units in a platform to system 
>> software
>> through the DMA Remapping Reporting (DMAR) ACPI table.
>> New fields are introduces for DMAR table. These new fields are set by
>> toolstack through parsing guest's config file. construct_dmar() is added to
>> build DMAR table according to the new fields.
>>
>> Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
>> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
>> ---
>>  tools/libacpi/build.c   | 57 
>> +++++++++++++++++++++++++++++++++++++++++++++++++
>>  tools/libacpi/libacpi.h |  9 ++++++++
>>  2 files changed, 66 insertions(+)
>>
>> diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
>> index f9881c9..c7cc784 100644
>> --- a/tools/libacpi/build.c
>> +++ b/tools/libacpi/build.c
>> @@ -28,6 +28,10 @@
>>  
>>  #define ACPI_MAX_SECONDARY_TABLES 16
>>  
>> +#define VTD_HOST_ADDRESS_WIDTH 39
>> +#define I440_PSEUDO_BUS_PLATFORM 0xff
>> +#define I440_PSEUDO_DEVFN_IOAPIC 0x0
> 
> I have some stupid questions. What are these I440 values? Where do they
> come from?
> 

Each IOAPIC device in the system reported via ACPI MADT must be
explicitly enumerated under one specific remapping hardware unit. We
assigned IOAPCI unit to bdf ff:00 and referenced Qemu vIOMMU implementation.


-- 
Best regards
Tianyu Lan

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