The command is used to retrieve the measurement of memory encrypted through the LAUNCH_UPDATE_DATA command.
Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: "Radim Krčmář" <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Brijesh Singh <[email protected]> --- arch/x86/kvm/svm.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 4667504acca5..b7099fd8b641 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5998,6 +5998,63 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &kvm->arch.sev_info; + struct sev_data_launch_measure *data; + struct kvm_sev_launch_measure params; + void *blob; + int ret; + + if (!sev_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, + sizeof(struct kvm_sev_launch_measure))) + return -EFAULT; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + blob = NULL; + if (params.uaddr) { + if (params.len > SEV_FW_BLOB_MAX_SIZE) { + ret = -EINVAL; + goto e_free; + } + + ret = -ENOMEM; + blob = kzalloc(params.len, GFP_KERNEL); + if (!blob) + goto e_free; + + data->address = __psp_pa(blob); + data->len = params.len; + } + + data->handle = sev->handle; + ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error); + + /* copy the measurement to userspace */ + if (blob && + copy_to_user((void __user *)(uintptr_t)params.uaddr, blob, params.len)) { + ret = -EFAULT; + goto e_free_blob; + } + + params.len = data->len; + if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, + sizeof(struct kvm_sev_launch_measure))) + ret = -EFAULT; + +e_free_blob: + kfree(blob); +e_free: + kfree(data); + return ret; +} + static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -6021,6 +6078,10 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) r = sev_launch_update_data(kvm, &sev_cmd); break; } + case KVM_SEV_LAUNCH_MEASURE: { + r = sev_launch_measure(kvm, &sev_cmd); + break; + } default: break; } -- 2.9.5
