linux-kernel - Re: [PATCH v2] KVM: x86: fix for missing initialization of return status variable

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Message-ID: <Ya4uR7I/7yvrgl6c@google.com>
Date:   Mon, 6 Dec 2021 15:37:43 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Ameer Hamza <amhamza.mgc@...il.com>
Cc:     vkuznets@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com
Subject: Re: [PATCH v2] KVM: x86: fix for missing initialization of return
 status variable

On Mon, Dec 06, 2021, Ameer Hamza wrote:
> If undefined ioctl number is passed to the kvm_vcpu_ioctl_device_attr
> function, it should return with error status.

No, if anything KVM should do KVM_BUG_ON() and return -EIO, because @ioctl is
completely KVM controlled.  But I'd personally prefer we leave it as is, there's
one call site that very clearly invokes the helper with only the three ioctls.
It's not a strong preference though.