linux-kernel - Re: [PATCH v2 0/2] KVM: selftests: Detect if KVM bugged the VM

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Date:   Wed, 29 Nov 2023 17:44:13 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Luczaj <mhal@...x.co>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Colton Lewis <coltonlewis@...gle.com>
Subject: Re: [PATCH v2 0/2] KVM: selftests: Detect if KVM bugged the VM

On Tue, 07 Nov 2023 17:09:51 -0800, Sean Christopherson wrote:
> Teach selftests' ioctl() macros to detect and report when an ioctl()
> unexpectedly fails because KVM has killed and/or bugged the VM.  Because
> selftests does the right thing and tries to gracefully clean up VMs, a
> bugged VM can generate confusing errors, e.g. when deleting memslots.
> 
> v2:
>  - Drop the ARM patch (not worth the churn).
>  - Drop macros for ioctls() that return file descriptors.  Looking at this
>    with fresh eyes, I agree they do more harm than good. [Oliver]
> 
> [...]

Applied to kvm-x86 selftests.

Xiaoyao, I definitely want to continue the conversation on improving the userspace
experience when KVM kills a VM, but I don't see a reason to hold up "fixing" the
selftests.

[1/2] KVM: selftests: Drop the single-underscore ioctl() helpers
      https://github.com/kvm-x86/linux/commit/6542a0036928
[2/2] KVM: selftests: Add logic to detect if ioctl() failed because VM was killed
      https://github.com/kvm-x86/linux/commit/1b78d474ce4e

--
https://github.com/kvm-x86/linux/tree/next