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Date: Wed, 16 Sep 2026 18:31:04 +0200
From: =?utf-8?B?SsO2cmcgUsO2ZGVs?= <joro@8bytes.org>
To: Tony Lindgren <tony.lindgren@linux.intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, 
	Sean Christopherson <seanjc@google.com>, Michael Roth <michael.roth@amd.com>, 
	Liam Merwick <liam.merwick@oracle.com>, Vishal Annapurve <vannapurve@google.com>, 
	Ninad Naik <ninadnaik07@gmail.com>, Joerg Roedel <joerg.roedel@amd.com>, 
	Tom Lendacky <thomas.lendacky@amd.com>, James Bottomley <James.Bottomley@hansenpartnership.com>, 
	kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-kselftest@vger.kernel.org, coconut-svsm@lists.linux.dev
Subject: Re: [PATCH v2 6/8] KVM: SEV: Add SNP vCPU state get and set commands
Message-ID: <aqrDUgB7nfdgzXpQ@8bytes.org>
References: <20260908103338.427254-1-joro@8bytes.org>
 <20260908103338.427254-7-joro@8bytes.org>
 <aqksXLLcmFDkM9Xj@tlindgre-MOBL1>
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In-Reply-To: <aqksXLLcmFDkM9Xj@tlindgre-MOBL1>

Hi Tony,

On Tue, Sep 15, 2026 at 02:30:36PM +0300, Tony Lindgren wrote:
> Nice, looks like snp_get/set_vcpu_state() could quite easily make use
> of KVM_EXPORT/IMPORT_VCPU?

That depends on whether KVM_EXPORT/IMPORT_VCPU will migrate the confidential
VCPU state (registers) only or hypervisor state as well. The get/set_state
helpers here only export/import the hypervisor tracking state for the guest
VCPUs.

On AMD the confidential VCPU state is migrated as part of the memory image when
guest execution has stopped on the source side.

-Joerg