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KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command

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The command finalize the guest receiving process and make the SEV guest
ready for the execution.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Message-Id: <d08914dc259644de94e29b51c3b68a13286fc5a3.1618498113.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Brijesh Singh 2021-04-15 15:55:40 +00:00 committed by Paolo Bonzini
parent 15fb7de1a7
commit 6a443def87
2 changed files with 31 additions and 0 deletions
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8
Documentation/virt/kvm/amd-memory-encryption.rst
View File

@ -418,6 +418,14 @@ Returns: 0 on success, -negative on error
__u32 trans_len;
};
17. KVM_SEV_RECEIVE_FINISH
------------------------
After completion of the migration flow, the KVM_SEV_RECEIVE_FINISH command can be
issued by the hypervisor to make the guest ready for execution.
Returns: 0 on success, -negative on error
References
==========

23
arch/x86/kvm/svm/sev.c
View File

@ -1551,6 +1551,26 @@ e_free_hdr:
return ret;
}
static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_receive_finish *data;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_FINISH, data, &argp->error);
kfree(data);
return ret;
}
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@ -1631,6 +1651,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_RECEIVE_UPDATE_DATA:
r = sev_receive_update_data(kvm, &sev_cmd);
break;
case KVM_SEV_RECEIVE_FINISH:
r = sev_receive_finish(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;