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Re: [PATCH v3 14/22] microvm: use 2G split unconditionally
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From: |
Gerd Hoffmann |
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Subject: |
Re: [PATCH v3 14/22] microvm: use 2G split unconditionally |
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Date: |
Tue, 26 May 2020 06:48:39 +0200 |
> > Well, I think we can (should) drop max-ram-below-4g too. There is
> > no reason to use that with microvm, other that shooting yourself into
> > the foot (by making mmio overlap with ram).
> >
> > With that being gone too there isn't much logic left ...
>
> I wonder if we need 2G split for microvm at all?
> Can we map 1 contiguous big blob from 0 GPA and overlay bios & other x86
> TOLUD stuff?
I think it would work, but it has some drawbacks:
(1) we loose a bit of memory.
(2) we loose a gigabyte page.
(3) we wouldn't have guard pages (unused address space) between
between ram and mmio space.
take care,
Gerd
- Re: [PATCH v3 22/22] [RfC] acpi: flip default to off for microvm, (continued)
- [PATCH v3 09/22] acpi: ged: rename event memory region, Gerd Hoffmann, 2020/05/20
- [PATCH v3 14/22] microvm: use 2G split unconditionally, Gerd Hoffmann, 2020/05/20
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Philippe Mathieu-Daudé, 2020/05/20
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/21
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/21
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Gerd Hoffmann, 2020/05/25
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/25
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally,
Gerd Hoffmann <=
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/27
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Paolo Bonzini, 2020/05/27
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/27
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Igor Mammedov, 2020/05/27
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Paolo Bonzini, 2020/05/27
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Gerd Hoffmann, 2020/05/28
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, Gerd Hoffmann, 2020/05/28
[PATCH v3 13/22] x86: coldplug cpus, Gerd Hoffmann, 2020/05/20
[PATCH v3 04/22] [testing] seabios: update binaries to master snapshot, Gerd Hoffmann, 2020/05/20