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Re: dma_blk helpers and infinite dma_memory_map retries
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From: |
Paolo Bonzini |
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Subject: |
Re: dma_blk helpers and infinite dma_memory_map retries |
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Date: |
Wed, 29 Jul 2020 16:37:29 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 |
On 29/07/20 16:26, John Snow wrote:
>>
>> This is the question: what is special about this address_space_map, that
>> makes it never succeed? The usual case where address_space_map fails is
>> simply two or more concurrent users of the bounce buffer, and these
>> solve by themselves when address_space_unmap calls
>> cpu_notify_map_clients. Do we never call address_space_unmap?
>>
>
> I had assumed naively that since the mapping was starting at 0xffffffff
> and this is the 32bit emulator that we had just run off the end of the
> universe ...
No, hwaddr is 64-bit anyway.
Paolo