linux-kernel - Re: [PATCH v2 01/11] KVM: SEV: fix compat ABI for KVM_MEMORY_ENCRYPT

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Date: Fri, 23 Feb 2024 16:04:46 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, michael.roth@....com,
 aik@....com
Subject: Re: [PATCH v2 01/11] KVM: SEV: fix compat ABI for
 KVM_MEMORY_ENCRYPT_OP

On 2/23/24 15:20, Sean Christopherson wrote:
> On Fri, Feb 23, 2024, Paolo Bonzini wrote:
>> The data structs for KVM_MEMORY_ENCRYPT_OP have different sizes for 32- and 64-bit
>> kernels, but they do not make any attempt to convert from one ABI to the other.
>> Fix this by adding the appropriate padding.
> Maybe call out that SEV+ is 64-bit only, so this doesn't matter in practice?  Or
> does this affect .compat_ioctl()?

Yes, .compat_ioctl() is what I had in mind - but that means I have to 
change "32- and 64-bit kernels" to "... userspace".

Paolo