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Re: [Qemu-devel] [PATCH 4/4] pam: setup pc.bios
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 4/4] pam: setup pc.bios |
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Date: |
Tue, 11 Apr 2017 17:18:19 +0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 11/04/2017 09:42, Xu, Anthony wrote:
>> I think this is wrong, the high copy should remain read-only or pflash
>> stops working when you remove PAM.
>
> I tried to set pc.bios as read-only and isa.bios as read&write,
> it doesn't work. render_memory_region doesn't honor readonly
> field of alias MemoryRegion.
>
> Two FlatRanges created for pc.bios and isa.bios point to the same
> MemoryRegion pc.bios. Both get readonly from pc.bios.
> Is this a bug or by design?
Read-write can use an alias to become read-only, but read-only cannot
use an alias to become read-write.
Let's sort this out later.
> Pc.bios and isa.bios are backed by the same memory block,
> so it may cause CPU TLB alias, any issue here?
No, it's okay.
Paolo