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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, linux-efi@vger.kernel.org,
	platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev,
	linux-mm@kvack.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Dov Murik <dovmurik@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@ibm.com>,
	Borislav Petkov <bp@alien8.de>,
	Michael Roth <michael.roth@amd.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>,
	tony.luck@intel.com, marcorr@google.com,
	sathyanarayanan.kuppuswamy@linux.intel.com
Subject: Re: [PATCH Part1 v5 38/38] virt: sevguest: Add support to get extended report
Date: Wed, 15 Sep 2021 11:02:05 +0100	[thread overview]
Message-ID: <YUHEnTDKEiSySY4a@work-vm> (raw)
In-Reply-To: <20210820151933.22401-39-brijesh.singh@amd.com>

* Brijesh Singh (brijesh.singh@amd.com) wrote:
> Version 2 of GHCB specification defines NAE to get the extended guest
> request. It is similar to the SNP_GET_REPORT ioctl. The main difference

^^^^^^^^^ is that 'report' not request?

> is related to the additional data that be returned. The additional
> data returned is a certificate blob that can be used by the SNP guest
> user. The certificate blob layout is defined in the GHCB specification.
> The driver simply treats the blob as a opaque data and copies it to
> userspace.
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

I'm confused by snp_dev->certs_data - who writes to that, and when?
I see it's allocated as shared by the probe function but then passed in
input data in get_ext_report - but get_ext_report memset's it.
What happens if two threads were to try and get an extended report at
the same time?

Dave


> ---
>  Documentation/virt/coco/sevguest.rst  |  22 +++++
>  drivers/virt/coco/sevguest/sevguest.c | 126 ++++++++++++++++++++++++++
>  include/uapi/linux/sev-guest.h        |  13 +++
>  3 files changed, 161 insertions(+)
> 
> diff --git a/Documentation/virt/coco/sevguest.rst b/Documentation/virt/coco/sevguest.rst
> index 25446670d816..7acb8696fca4 100644
> --- a/Documentation/virt/coco/sevguest.rst
> +++ b/Documentation/virt/coco/sevguest.rst
> @@ -85,3 +85,25 @@ on the various fileds passed in the key derivation request.
>  
>  On success, the snp_derived_key_resp.data will contains the derived key
>  value.
> +
> +2.2 SNP_GET_EXT_REPORT
> +----------------------
> +:Technology: sev-snp
> +:Type: guest ioctl
> +:Parameters (in/out): struct snp_ext_report_req
> +:Returns (out): struct snp_report_resp on success, -negative on error
> +
> +The SNP_GET_EXT_REPORT ioctl is similar to the SNP_GET_REPORT. The difference is
> +related to the additional certificate data that is returned with the report.
> +The certificate data returned is being provided by the hypervisor through the
> +SNP_SET_EXT_CONFIG.
> +
> +The ioctl uses the SNP_GUEST_REQUEST (MSG_REPORT_REQ) command provided by the SEV-SNP
> +firmware to get the attestation report.
> +
> +On success, the snp_ext_report_resp.data will contains the attestation report
> +and snp_ext_report_req.certs_address will contains the certificate blob. If the
> +length of the blob is lesser than expected then snp_ext_report_req.certs_len will
> +be updated with the expected value.
> +
> +See GHCB specification for further detail on how to parse the certificate blob.
> diff --git a/drivers/virt/coco/sevguest/sevguest.c b/drivers/virt/coco/sevguest/sevguest.c
> index 621b1c5a9cfc..d978eb432c4c 100644
> --- a/drivers/virt/coco/sevguest/sevguest.c
> +++ b/drivers/virt/coco/sevguest/sevguest.c
> @@ -39,6 +39,7 @@ struct snp_guest_dev {
>  	struct device *dev;
>  	struct miscdevice misc;
>  
> +	void *certs_data;
>  	struct snp_guest_crypto *crypto;
>  	struct snp_guest_msg *request, *response;
>  };
> @@ -347,6 +348,117 @@ static int get_derived_key(struct snp_guest_dev *snp_dev, struct snp_user_guest_
>  	return rc;
>  }
>  
> +static int get_ext_report(struct snp_guest_dev *snp_dev, struct snp_user_guest_request *arg)
> +{
> +	struct snp_guest_crypto *crypto = snp_dev->crypto;
> +	struct snp_guest_request_data input = {};
> +	struct snp_ext_report_req req;
> +	int ret, npages = 0, resp_len;
> +	struct snp_report_resp *resp;
> +	struct snp_report_req *rreq;
> +	unsigned long fw_err = 0;
> +
> +	if (!arg->req_data || !arg->resp_data)
> +		return -EINVAL;
> +
> +	/* Copy the request payload from the userspace */
> +	if (copy_from_user(&req, (void __user *)arg->req_data, sizeof(req)))
> +		return -EFAULT;
> +
> +	rreq = &req.data;
> +
> +	/* Message version must be non-zero */
> +	if (!rreq->msg_version)
> +		return -EINVAL;
> +
> +	if (req.certs_len) {
> +		if (req.certs_len > SEV_FW_BLOB_MAX_SIZE ||
> +		    !IS_ALIGNED(req.certs_len, PAGE_SIZE))
> +			return -EINVAL;
> +	}
> +
> +	if (req.certs_address && req.certs_len) {
> +		if (!access_ok(req.certs_address, req.certs_len))
> +			return -EFAULT;
> +
> +		/*
> +		 * Initialize the intermediate buffer with all zero's. This buffer
> +		 * is used in the guest request message to get the certs blob from
> +		 * the host. If host does not supply any certs in it, then we copy
> +		 * zeros to indicate that certificate data was not provided.
> +		 */
> +		memset(snp_dev->certs_data, 0, req.certs_len);
> +
> +		input.data_gpa = __pa(snp_dev->certs_data);
> +		npages = req.certs_len >> PAGE_SHIFT;
> +	}
> +
> +	/*
> +	 * The intermediate response buffer is used while decrypting the
> +	 * response payload. Make sure that it has enough space to cover the
> +	 * authtag.
> +	 */
> +	resp_len = sizeof(resp->data) + crypto->a_len;
> +	resp = kzalloc(resp_len, GFP_KERNEL_ACCOUNT);
> +	if (!resp)
> +		return -ENOMEM;
> +
> +	if (copy_from_user(resp, (void __user *)arg->resp_data, sizeof(*resp))) {
> +		ret = -EFAULT;
> +		goto e_free;
> +	}
> +
> +	/* Encrypt the userspace provided payload */
> +	ret = enc_payload(snp_dev, rreq->msg_version, SNP_MSG_REPORT_REQ,
> +			  &rreq->user_data, sizeof(rreq->user_data));
> +	if (ret)
> +		goto e_free;
> +
> +	/* Call firmware to process the request */
> +	input.req_gpa = __pa(snp_dev->request);
> +	input.resp_gpa = __pa(snp_dev->response);
> +	input.data_npages = npages;
> +	memset(snp_dev->response, 0, sizeof(*snp_dev->response));
> +	ret = snp_issue_guest_request(EXT_GUEST_REQUEST, &input, &fw_err);
> +
> +	/* Popogate any firmware error to the userspace */
> +	arg->fw_err = fw_err;
> +
> +	/* If certs length is invalid then copy the returned length */
> +	if (arg->fw_err == SNP_GUEST_REQ_INVALID_LEN) {
> +		req.certs_len = input.data_npages << PAGE_SHIFT;
> +
> +		if (copy_to_user((void __user *)arg->req_data, &req, sizeof(req)))
> +			ret = -EFAULT;
> +
> +		goto e_free;
> +	}
> +
> +	if (ret)
> +		goto e_free;
> +
> +	/* Decrypt the response payload */
> +	ret = verify_and_dec_payload(snp_dev, resp->data, resp_len);
> +	if (ret)
> +		goto e_free;
> +
> +	/* Copy the certificate data blob to userspace */
> +	if (req.certs_address &&
> +	    copy_to_user((void __user *)req.certs_address, snp_dev->certs_data,
> +			 req.certs_len)) {
> +		ret = -EFAULT;
> +		goto e_free;
> +	}
> +
> +	/* Copy the response payload to userspace */
> +	if (copy_to_user((void __user *)arg->resp_data, resp, sizeof(*resp)))
> +		ret = -EFAULT;
> +
> +e_free:
> +	kfree(resp);
> +	return ret;
> +}
> +
>  static long snp_guest_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
>  {
>  	struct snp_guest_dev *snp_dev = to_snp_dev(file);
> @@ -368,6 +480,10 @@ static long snp_guest_ioctl(struct file *file, unsigned int ioctl, unsigned long
>  		ret = get_derived_key(snp_dev, &input);
>  		break;
>  	}
> +	case SNP_GET_EXT_REPORT: {
> +		ret = get_ext_report(snp_dev, &input);
> +		break;
> +	}
>  	default:
>  		break;
>  	}
> @@ -453,6 +569,12 @@ static int __init snp_guest_probe(struct platform_device *pdev)
>  		goto e_free_req;
>  	}
>  
> +	snp_dev->certs_data = alloc_shared_pages(SEV_FW_BLOB_MAX_SIZE);
> +	if (IS_ERR(snp_dev->certs_data)) {
> +		ret = PTR_ERR(snp_dev->certs_data);
> +		goto e_free_resp;
> +	}
> +
>  	misc = &snp_dev->misc;
>  	misc->minor = MISC_DYNAMIC_MINOR;
>  	misc->name = DEVICE_NAME;
> @@ -460,6 +582,9 @@ static int __init snp_guest_probe(struct platform_device *pdev)
>  
>  	return misc_register(misc);
>  
> +e_free_resp:
> +	free_shared_pages(snp_dev->response, sizeof(struct snp_guest_msg));
> +
>  e_free_req:
>  	free_shared_pages(snp_dev->request, sizeof(struct snp_guest_msg));
>  
> @@ -475,6 +600,7 @@ static int __exit snp_guest_remove(struct platform_device *pdev)
>  
>  	free_shared_pages(snp_dev->request, sizeof(struct snp_guest_msg));
>  	free_shared_pages(snp_dev->response, sizeof(struct snp_guest_msg));
> +	free_shared_pages(snp_dev->certs_data, SEV_FW_BLOB_MAX_SIZE);
>  	deinit_crypto(snp_dev->crypto);
>  	misc_deregister(&snp_dev->misc);
>  
> diff --git a/include/uapi/linux/sev-guest.h b/include/uapi/linux/sev-guest.h
> index 621a9167df7a..23659215fcfb 100644
> --- a/include/uapi/linux/sev-guest.h
> +++ b/include/uapi/linux/sev-guest.h
> @@ -57,6 +57,16 @@ struct snp_derived_key_resp {
>  	__u8 data[64];
>  };
>  
> +struct snp_ext_report_req {
> +	struct snp_report_req data;
> +
> +	/* where to copy the certificate blob */
> +	__u64 certs_address;
> +
> +	/* length of the certificate blob */
> +	__u32 certs_len;
> +};
> +
>  #define SNP_GUEST_REQ_IOC_TYPE	'S'
>  
>  /* Get SNP attestation report */
> @@ -65,4 +75,7 @@ struct snp_derived_key_resp {
>  /* Get a derived key from the root */
>  #define SNP_GET_DERIVED_KEY _IOWR(SNP_GUEST_REQ_IOC_TYPE, 0x1, struct snp_user_guest_request)
>  
> +/* Get SNP extended report as defined in the GHCB specification version 2. */
> +#define SNP_GET_EXT_REPORT _IOWR(SNP_GUEST_REQ_IOC_TYPE, 0x2, struct snp_user_guest_request)
> +
>  #endif /* __UAPI_LINUX_SEV_GUEST_H_ */
> -- 
> 2.17.1
> 
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK


  parent reply	other threads:[~2021-09-15 10:02 UTC|newest]

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 15:18 [PATCH Part1 v5 00/38] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 01/38] x86/mm: Add sev_feature_enabled() helper Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 02/38] x86/sev: Shorten GHCB terminate macro names Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 03/38] x86/sev: Get rid of excessive use of defines Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 04/38] x86/head64: Carve out the guest encryption postprocessing into a helper Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 05/38] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 06/38] x86/sev: Save the negotiated GHCB version Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 07/38] x86/sev: Add support for hypervisor feature VMGEXIT Brijesh Singh
2021-08-23  9:47   ` Borislav Petkov
2021-08-23 18:25     ` Brijesh Singh
2021-08-23 18:34       ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 08/38] x86/sev: Check SEV-SNP features support Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 09/38] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 10/38] x86/sev: Check the vmpl level Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 11/38] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2021-08-23 14:16   ` Borislav Petkov
2021-08-23 18:55     ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 12/38] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 13/38] x86/sev: " Brijesh Singh
2021-08-23 17:35   ` Borislav Petkov
2021-08-23 18:56     ` Brijesh Singh
2021-08-23 19:45       ` [PATCH] x86/sev: Remove do_early_exception() forward declarations Borislav Petkov
2021-08-23 20:06         ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 14/38] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 15/38] x86/kernel: Make the bss.decrypted section shared in RMP table Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 16/38] x86/kernel: Validate rom memory before accessing when SEV-SNP is active Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 17/38] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2021-08-25 11:06   ` Borislav Petkov
2021-08-25 13:54     ` Brijesh Singh
2021-08-25 14:00       ` Borislav Petkov
2021-08-27 17:09   ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 18/38] KVM: SVM: Define sev_features and vmpl field in the VMSA Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 19/38] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 20/38] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 21/38] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 22/38] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 23/38] x86/head/64: set up a startup %gs for stack protector Brijesh Singh
2021-08-25 14:29   ` Borislav Petkov
2021-08-25 15:18     ` Michael Roth
2021-08-25 16:29       ` Borislav Petkov
2021-08-27 13:38         ` Michael Roth
2021-08-31  8:03           ` Borislav Petkov
2021-08-31 23:30             ` Michael Roth
2021-08-25 15:07   ` Joerg Roedel
2021-08-25 17:07     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 24/38] x86/sev: move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 25/38] KVM: x86: move lookup of indexed CPUID leafs " Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 26/38] x86/compressed/acpi: move EFI config table access to common code Brijesh Singh
2021-08-25 15:18   ` Borislav Petkov
2021-08-25 17:14     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 27/38] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 28/38] x86/compressed/64: enable SEV-SNP-validated CPUID in #VC handler Brijesh Singh
2021-08-25 19:19   ` Borislav Petkov
2021-08-27 16:46     ` Michael Roth
2021-08-31 10:04       ` Borislav Petkov
2021-09-01  1:03         ` Michael Roth
2021-09-02 10:53           ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 29/38] x86/boot: add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2021-08-27 13:51   ` Borislav Petkov
2021-08-27 18:48     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 30/38] x86/compressed/64: store Confidential Computing blob address " Brijesh Singh
2021-08-27 14:15   ` Borislav Petkov
2021-08-27 19:09     ` Michael Roth
2021-08-31 10:26       ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 31/38] x86/compressed/64: add identity mapping for Confidential Computing blob Brijesh Singh
2021-08-27 14:43   ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 32/38] x86/sev: enable SEV-SNP-validated CPUID in #VC handlers Brijesh Singh
2021-08-27 15:18   ` Borislav Petkov
2021-08-27 15:47     ` Brijesh Singh
2021-08-27 16:56       ` Borislav Petkov
2021-08-27 18:39       ` Michael Roth
2021-08-27 18:32     ` Michael Roth
2021-08-30 16:03       ` Michael Roth
2021-08-31 16:22       ` Borislav Petkov
2021-09-01  1:16         ` Michael Roth
2021-09-02 11:05           ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2021-08-27 17:44   ` Borislav Petkov
2021-08-27 18:07     ` Brijesh Singh
2021-08-27 18:13       ` Borislav Petkov
2021-08-27 18:27         ` Brijesh Singh
2021-08-27 18:38           ` Borislav Petkov
2021-08-27 19:57       ` Tom Lendacky
2021-08-27 20:17         ` Borislav Petkov
2021-08-27 20:31           ` Tom Lendacky
2021-08-20 15:19 ` [PATCH Part1 v5 34/38] x86/sev: Add snp_msg_seqno() helper Brijesh Singh
2021-08-27 18:41   ` Borislav Petkov
2021-08-30 15:07     ` Brijesh Singh
2021-09-02 11:26       ` Borislav Petkov
2021-09-02 15:27         ` Brijesh Singh
2021-08-31 20:46   ` Dov Murik
2021-08-31 21:13     ` Brijesh Singh
2021-09-09 14:54   ` Peter Gonda
2021-09-09 15:26     ` Brijesh Singh
2021-09-09 15:43       ` Peter Gonda
2021-09-09 16:17         ` Brijesh Singh
2021-09-09 16:21           ` Peter Gonda
2021-09-09 19:26             ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 35/38] x86/sev: Register SNP guest request platform device Brijesh Singh
2021-08-31 11:37   ` Dov Murik
2021-08-31 16:03     ` Brijesh Singh
2021-09-02 16:40   ` Borislav Petkov
2021-09-02 19:58     ` Brijesh Singh
2021-09-03  8:15       ` Dov Murik
2021-09-03 12:08         ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 36/38] virt: Add SEV-SNP guest driver Brijesh Singh
2021-09-06 17:38   ` Borislav Petkov
2021-09-07 13:35     ` Brijesh Singh
2021-09-08 13:44       ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 37/38] virt: sevguest: Add support to derive key Brijesh Singh
2021-08-31 18:59   ` Dov Murik
2021-08-31 21:04     ` Brijesh Singh
2021-09-01  5:33       ` Dov Murik
2021-09-08 14:00   ` Borislav Petkov
2021-09-08 21:44     ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 38/38] virt: sevguest: Add support to get extended report Brijesh Singh
2021-08-31 20:22   ` Dov Murik
2021-08-31 21:11     ` Brijesh Singh
2021-09-01  8:32       ` Dov Murik
2021-09-08 17:53   ` Borislav Petkov
2021-09-15 11:46     ` Brijesh Singh
2021-09-15 10:02   ` Dr. David Alan Gilbert [this message]
2021-09-15 11:53     ` Brijesh Singh

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