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Commit 9f5b5b95 authored by Brijesh Singh's avatar Brijesh Singh
Browse files

KVM: SVM: Add support for SEV LAUNCH_SECRET command 



The command is used for injecting a secret into the guest memory region.

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: "Radim Krčmář" <rkrcmar@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
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
parent 7d1594f5

arch/x86/kvm/svm.c

+68 −0
Original line number Diff line number Diff line
@@ -6397,6 +6397,71 @@ static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec) 
	return ret;

}



static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)

{

	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	struct sev_data_launch_secret *data;

	struct kvm_sev_launch_secret params;

	struct page **pages;

	void *blob, *hdr;

	unsigned long n;

	int ret;



	if (!sev_guest(kvm))

		return -ENOTTY;



	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))

		return -EFAULT;



	pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);

	if (!pages)

		return -ENOMEM;



	/*

	 * The secret must be copied into contiguous memory region, lets verify

	 * that userspace memory pages are contiguous before we issue command.

	 */

	if (get_num_contig_pages(0, pages, n) != n) {

		ret = -EINVAL;

		goto e_unpin_memory;

	}



	ret = -ENOMEM;

	data = kzalloc(sizeof(*data), GFP_KERNEL);

	if (!data)

		goto e_unpin_memory;



	blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len);

	if (IS_ERR(blob)) {

		ret = PTR_ERR(blob);

		goto e_free;

	}



	data->trans_address = __psp_pa(blob);

	data->trans_len = params.trans_len;



	hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);

	if (IS_ERR(hdr)) {

		ret = PTR_ERR(hdr);

		goto e_free_blob;

	}

	data->trans_address = __psp_pa(blob);

	data->trans_len = params.trans_len;



	data->handle = sev->handle;

	ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error);



	kfree(hdr);



e_free_blob:

	kfree(blob);

e_free:

	kfree(data);

e_unpin_memory:

	sev_unpin_memory(kvm, pages, n);

	return ret;

}



static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)

{

	struct kvm_sev_cmd sev_cmd;
@@ -6435,6 +6500,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) 
	case KVM_SEV_DBG_ENCRYPT:

		r = sev_dbg_crypt(kvm, &sev_cmd, false);

		break;

	case KVM_SEV_LAUNCH_SECRET:

		r = sev_launch_secret(kvm, &sev_cmd);

		break;

	default:

		r = -EINVAL;

		goto out;