The command is used for finializing the guest launch into SEV mode. For more information see [1], section 6.3 [1] http://support.amd.com/TechDocs/55766_SEV-KM%20API_Spec.pdf Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx> --- arch/x86/kvm/svm.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c78bdc6..60cc0f7 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5497,6 +5497,79 @@ err_1: return ret; } +static int sev_launch_finish(struct kvm *kvm, + struct kvm_sev_launch_finish __user *argp, + int *psp_ret) +{ + int i, ret; + void *mask = NULL; + int buffer_len, len; + struct kvm_vcpu *vcpu; + struct psp_data_launch_finish *finish; + struct kvm_sev_launch_finish params; + + if (!kvm_sev_guest()) + return -EINVAL; + + /* Get the parameters from the user */ + if (copy_from_user(¶ms, argp, sizeof(*argp))) + return -EFAULT; + + buffer_len = sizeof(*finish) + (sizeof(u64) * params.vcpu_count); + finish = kzalloc(buffer_len, GFP_KERNEL); + if (!finish) + return -ENOMEM; + + /* copy the vcpu mask from user */ + if (params.vcpu_mask_length && params.vcpu_mask_addr) { + ret = -ENOMEM; + mask = (void *) get_zeroed_page(GFP_KERNEL); + if (!mask) + goto err_1; + + len = min_t(size_t, PAGE_SIZE, params.vcpu_mask_length); + ret = -EFAULT; + if (copy_from_user(mask, (uint8_t*)params.vcpu_mask_addr, len)) + goto err_2; + finish->vcpus.state_mask_addr = __psp_pa(mask); + } + + finish->handle = kvm_sev_handle(); + finish->hdr.buffer_len = buffer_len; + finish->vcpus.state_count = params.vcpu_count; + finish->vcpus.state_length = params.vcpu_length; + kvm_for_each_vcpu(i, vcpu, kvm) { + finish->vcpus.state_addr[i] = + to_svm(vcpu)->vmcb_pa | sme_me_mask; + if (i == params.vcpu_count) + break; + } + + /* launch finish */ + ret = psp_guest_launch_finish(finish, psp_ret); + if (ret) { + printk(KERN_ERR "SEV: LAUNCH_FINISH ret=%d (%#010x)\n", + ret, *psp_ret); + goto err_2; + } + + /* Iterate through each vcpus and set SEV KVM_SEV_FEATURE bit in + * KVM_CPUID_FEATURE to indicate that SEV is enabled on this vcpu + */ + kvm_for_each_vcpu(i, vcpu, kvm) + svm_cpuid_update(vcpu); + + /* copy the measurement for user */ + if (copy_to_user(argp->measurement, finish->measurement, 32)) + ret = -EFAULT; + +err_2: + free_page((unsigned long)mask); +err_1: + kfree(finish); + return ret; +} + static int amd_sev_issue_cmd(struct kvm *kvm, struct kvm_sev_issue_cmd __user *user_data) { @@ -5517,6 +5590,11 @@ static int amd_sev_issue_cmd(struct kvm *kvm, &arg.ret_code); break; } + case KVM_SEV_LAUNCH_FINISH: { + r = sev_launch_finish(kvm, (void *)arg.opaque, + &arg.ret_code); + break; + } default: break; } -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
