On 9/28/22 09:10, Maxim Levitsky wrote:
I also think that outside KVM developers nobody should be using KVM on 32 bit host. However for_developement_ I think that 32 bit KVM support is very useful, as it allows to smoke test the support for 32 bit nested hypervisors, which I do once in a while, and can even probably be useful to some users (e.g running some legacy stuff in a VM, which includes a hypervisor, especially to run really legacy OSes / custom bare metal software, using an old hypervisor) - or in other words, 32 bit nested KVM is mostly useless, but other 32 bit nested hypervisors can be useful. Yes, I can always use an older 32 bit kernel in a guest with KVM support, but as long as current kernel works, it is useful to use the same kernel on host and guest.
Yeah, I would use older 32 bit kernels just like I use RHEL4 to test PIT reinjection. :) But really the ultimate solution to this would be to improve kvm-unit-tests so that we can compile vmx.c and svm.c for 32-bit.
Paolo
