From: Paolo Bonzini <pbonzini@redhat.com>
To: Maxim Levitsky <mlevitsk@redhat.com>,
Sean Christopherson <seanjc@google.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: disable on 32-bit unless CONFIG_BROKEN
Date: Wed, 28 Sep 2022 11:55:23 +0200 [thread overview]
Message-ID: <15291c3f-d55c-a206-9261-253a1a33dce1@redhat.com> (raw)
In-Reply-To: <ed74c9a9d6a0d2fd2ad8bd98214ad36e97c243a0.camel@redhat.com>
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
next prev parent reply other threads:[~2022-09-28 9:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-26 16:51 [PATCH] KVM: x86: disable on 32-bit unless CONFIG_BROKEN Paolo Bonzini
2022-09-27 17:07 ` Sean Christopherson
2022-09-28 7:10 ` Maxim Levitsky
2022-09-28 9:55 ` Paolo Bonzini [this message]
2022-09-28 16:12 ` Sean Christopherson
2022-09-28 17:43 ` Maxim Levitsky
2022-09-28 17:44 ` Maxim Levitsky
2022-09-28 17:55 ` Sean Christopherson
2022-09-29 13:26 ` Paolo Bonzini
2022-09-29 13:52 ` Maxim Levitsky
2022-09-29 15:07 ` Paolo Bonzini
2023-02-17 19:36 ` Thomas Huth
2023-02-22 22:27 ` Sean Christopherson
2023-02-23 7:01 ` Thomas Huth
2023-02-23 8:33 ` Maxim Levitsky
2023-02-23 22:10 ` Sean Christopherson
2023-02-24 6:28 ` Thomas Huth
2022-09-28 10:04 ` Paolo Bonzini
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