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Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin
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From: |
Paolo Bonzini |
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Subject: |
Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin |
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Date: |
Wed, 21 Oct 2020 21:50:15 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 |
On 21/10/20 20:49, Alex Williamson wrote:
> I can understand the general benefit of flatview_simplify(), but I
> wonder if the best short term solution is to skip operating on the x86
> PAM range, which I understand to be a small number of memory chunks
> below 1MB.
I'd rather remove flatview_simplify altogether, it probably triggers
relatively rarely. Possibly do not let it operate on RAM/ROM regions,
only on I/O regions.
> I might also wonder why the EHCI controller on this
> platform is choosing that range for DMA.
I assume it's the BIOS's driver and it's choosing a range in low memory,
but still I'm not sure why its DMA is racing against the PAM update
(which is done very early). Felix, do you know the answer?
Paolo
- [PATCH 0/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCuioc, 2020/10/16
- [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCuioc, 2020/10/16
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Paolo Bonzini, 2020/10/16
- 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCui-oc, 2020/10/19
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Alex Williamson, 2020/10/19
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Paolo Bonzini, 2020/10/20
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Alex Williamson, 2020/10/20
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Paolo Bonzini, 2020/10/21
- 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCui-oc, 2020/10/21
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Alex Williamson, 2020/10/21
- Re: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin,
Paolo Bonzini <=
- 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCui-oc, 2020/10/21
- Re: 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, Paolo Bonzini, 2020/10/21
- 答复: 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCui-oc, 2020/10/22
- 答复: 答复: [PATCH 1/1] Skip flatview_simplify() for cpu vendor zhaoxin, FelixCui-oc, 2020/10/26