From fddecf6a237ee464db7a1771fad6507d8c180c03 Mon Sep 17 00:00:00 2001 From: Brijesh Singh Date: Thu, 15 Apr 2021 15:54:15 +0000 Subject: [PATCH] KVM: SVM: Add KVM_SEV_SEND_FINISH command The command is used to finailize the encryption context created with KVM_SEV_SEND_START command. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Steve Rutherford Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Message-Id: <5082bd6a8539d24bc55a1dd63a1b341245bb168f.1618498113.git.ashish.kalra@amd.com> Signed-off-by: Paolo Bonzini --- .../virt/kvm/amd-memory-encryption.rst | 8 +++++++ arch/x86/kvm/svm/sev.c | 23 +++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst index 79da88a141355..03f2518cfbeb4 100644 --- a/Documentation/virt/kvm/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/amd-memory-encryption.rst @@ -348,6 +348,14 @@ Returns: 0 on success, -negative on error __u32 trans_len; }; +13. KVM_SEV_SEND_FINISH +------------------------ + +After completion of the migration flow, the KVM_SEV_SEND_FINISH command can be +issued by the hypervisor to delete the encryption context. + +Returns: 0 on success, -negative on error + References ========== diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index a534ec9ae172c..f25c52a2dc140 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1357,6 +1357,26 @@ e_unpin: return ret; } +static int sev_send_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_send_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_SEND_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; @@ -1425,6 +1445,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp) case KVM_SEV_SEND_UPDATE_DATA: r = sev_send_update_data(kvm, &sev_cmd); break; + case KVM_SEV_SEND_FINISH: + r = sev_send_finish(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; -- 2.30.2