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Re: [PATCH v3 14/22] microvm: use 2G split unconditionally
From: |
Gerd Hoffmann |
Subject: |
Re: [PATCH v3 14/22] microvm: use 2G split unconditionally |
Date: |
Thu, 28 May 2020 09:17:52 +0200 |
Hi,
> > (1) we loose a bit of memory.
> it's probably not a big enough to care about, we do similar ovarlay
> mapping on pc/q35
> at the beginning of RAM
Yes, shouldn't be too much.
> > (2) we loose a gigabyte page.
> I'm not sure waht exactly we loose in this case.
The 1G page for 0xc0000000 -> 0xffffffff (as explained by paolo).
> > (3) we wouldn't have guard pages (unused address space) between
> > between ram and mmio space.
> if it's holes' mmio,then do we really need them (access is going
> to be terminated
> either in always valid RAM or in valid mmio hole)?
Not required, but more robust. Less likely that the guest touches mmio
by accident.
I'd expect it also requires some e820 hacks.
cheers,
Gerd
- Re: [PATCH v3 14/22] microvm: use 2G split unconditionally, (continued)
- 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, 2020/05/26
- 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 <=
[PATCH v3 21/22] [RfC] acpi: add per machine type acpi default, Gerd Hoffmann, 2020/05/20
[PATCH v3 20/22] microvm/acpi: disable virtio-mmio cmdline hack, Gerd Hoffmann, 2020/05/20
[PATCH v3 22/22] [RfC] acpi: flip default to off for microvm, Gerd Hoffmann, 2020/05/20
[PATCH v3 09/22] acpi: ged: rename event memory region, Gerd Hoffmann, 2020/05/20
[PATCH v3 16/22] microvm/acpi: add minimal acpi support, Gerd Hoffmann, 2020/05/20