On Sun, 22 Aug 2021 16:25:23 +0100, Marc Zyngier wrote:
> KVM hacking on the Apple M1 SoC has shown that kvmtool (and other
> VMMs) make pretty poor use of the IPA space parameter (read: do not
> use it and just pass 0). This results in a guest that cannot boot
> (recent kernels will just send the VMM packing), and in general means
> we don't benefit from smaller page tables at stage-2.
>
> This series does three things:
> - It switches kvmtool away from the default 40bit, allowing large VMs
> to be created (I have booted a 4TB VM)
> - It reduces the requested IPA space to be as small as possible
> - It tells the user why the VM cannot boot when the IPA space required
> exceeds that of the HW
>
> [...]
Applied to kvmtool (master), thanks!
[1/3] kvmtool: Abstract KVM_VM_TYPE into a weak function
https://git.kernel.org/will/kvmtool/c/4250819de93b
[2/3] kvmtool: arm64: Use the maximum supported IPA size when creating the VM
https://git.kernel.org/will/kvmtool/c/066b5c06c4e3
[3/3] kvmtool: arm64: Configure VM with the minimal required IPA space
https://git.kernel.org/will/kvmtool/c/bdb86d0c0c95
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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