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From: Dov Murik <dovmurik@linux.ibm.com>
To: Brijesh Singh <brijesh.singh@amd.com>,
	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
Cc: 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>,
	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 35/38] x86/sev: Register SNP guest request platform device
Date: Tue, 31 Aug 2021 14:37:49 +0300	[thread overview]
Message-ID: <56b37edd-6315-953c-271c-f2c4025be3f7@linux.ibm.com> (raw)
In-Reply-To: <20210820151933.22401-36-brijesh.singh@amd.com>

Hi Brijesh,


On 20/08/2021 18:19, Brijesh Singh wrote:
> Version 2 of GHCB specification provides NAEs that can be used by the SNP
> guest to communicate with the PSP without risk from a malicious hypervisor
> who wishes to read, alter, drop or replay the messages sent.
> 
> In order to communicate with the PSP, the guest need to locate the secrets
> page inserted by the hypervisor during the SEV-SNP guest launch. The
> secrets page contains the communication keys used to send and receive the
> encrypted messages between the guest and the PSP. The secrets page location
> is passed through the setup_data.
> 
> Create a platform device that the SNP guest driver can bind to get the
> platform resources such as encryption key and message id to use to
> communicate with the PSP. The SNP guest driver can provide userspace
> interface to get the attestation report, key derivation, extended
> attestation report etc.
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
>  arch/x86/kernel/sev.c     | 68 +++++++++++++++++++++++++++++++++++++++
>  include/linux/sev-guest.h |  5 +++
>  2 files changed, 73 insertions(+)
> 
> diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
> index f42cd5a8e7bb..ab17c93634e9 100644
> --- a/arch/x86/kernel/sev.c
> +++ b/arch/x86/kernel/sev.c
> @@ -22,6 +22,8 @@
>  #include <linux/log2.h>
>  #include <linux/efi.h>
>  #include <linux/sev-guest.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
>  
>  #include <asm/cpu_entry_area.h>
>  #include <asm/stacktrace.h>
> @@ -37,6 +39,7 @@
>  #include <asm/apic.h>
>  #include <asm/efi.h>
>  #include <asm/cpuid.h>
> +#include <asm/setup.h>
>  
>  #include "sev-internal.h"
>  
> @@ -2164,3 +2167,68 @@ int snp_issue_guest_request(int type, struct snp_guest_request_data *input, unsi
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(snp_issue_guest_request);
> +
> +static struct platform_device guest_req_device = {
> +	.name		= "snp-guest",
> +	.id		= -1,
> +};
> +
> +static u64 find_secrets_paddr(void)
> +{
> +	u64 pa_data = boot_params.cc_blob_address;
> +	struct cc_blob_sev_info info;
> +	void *map;
> +
> +	/*
> +	 * The CC blob contains the address of the secrets page, check if the
> +	 * blob is present.
> +	 */
> +	if (!pa_data)
> +		return 0;
> +
> +	map = early_memremap(pa_data, sizeof(info));
> +	memcpy(&info, map, sizeof(info));
> +	early_memunmap(map, sizeof(info));
> +
> +	/* Verify that secrets page address is passed */
> +	if (info.secrets_phys && info.secrets_len == PAGE_SIZE)
> +		return info.secrets_phys;
> +
> +	return 0;
> +}
> +
> +static int __init add_snp_guest_request(void)
> +{
> +	struct snp_secrets_page_layout *layout;
> +	struct snp_guest_platform_data data;
> +
> +	if (!sev_feature_enabled(SEV_SNP))
> +		return -ENODEV;
> +
> +	snp_secrets_phys = find_secrets_paddr();
> +	if (!snp_secrets_phys)
> +		return -ENODEV;
> +
> +	layout = snp_map_secrets_page();
> +	if (!layout)
> +		return -ENODEV;
> +
> +	/*
> +	 * The secrets page contains three VMPCK that can be used for
> +	 * communicating with the PSP. We choose the VMPCK0 to encrypt guest
> +	 * messages send and receive by the Linux. Provide the key and
> +	 * id through the platform data to the driver.
> +	 */
> +	data.vmpck_id = 0;
> +	memcpy_fromio(data.vmpck, layout->vmpck0, sizeof(data.vmpck));
> +
> +	iounmap(layout);
> +
> +	platform_device_add_data(&guest_req_device, &data, sizeof(data));
> +
> +	if (!platform_device_register(&guest_req_device))
> +		dev_info(&guest_req_device.dev, "secret phys 0x%llx\n", snp_secrets_phys);

Should you return the error code from platform_device_register() in case
it fails (returns something other than zero)?

-Dov

> +
> +	return 0;
> +}
> +device_initcall(add_snp_guest_request);
> diff --git a/include/linux/sev-guest.h b/include/linux/sev-guest.h
> index 16b6af24fda7..e1cb3f7dd034 100644
> --- a/include/linux/sev-guest.h
> +++ b/include/linux/sev-guest.h
> @@ -68,6 +68,11 @@ struct snp_guest_request_data {
>  	unsigned int data_npages;
>  };
>  
> +struct snp_guest_platform_data {
> +	u8 vmpck_id;
> +	char vmpck[VMPCK_KEY_LEN];
> +};
> +
>  #ifdef CONFIG_AMD_MEM_ENCRYPT
>  int snp_issue_guest_request(int vmgexit_type, struct snp_guest_request_data *input,
>  			    unsigned long *fw_err);
> 

  reply	other threads:[~2021-08-31 11:39 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 [this message]
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
2021-09-15 11:53     ` Brijesh Singh

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