From: Peter Gonda <pgonda@google.com>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: "the arch/x86 maintainers" <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
kvm list <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>,
Jim Mattson <jmattson@google.com>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Sergio Lopez <slp@redhat.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>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
brijesh.ksingh@gmail.com, Tony Luck <tony.luck@intel.com>,
Marc Orr <marcorr@google.com>,
Sathyanarayanan Kuppuswamy
<sathyanarayanan.kuppuswamy@linux.intel.com>
Subject: Re: [PATCH v9 40/43] x86/sev: Register SEV-SNP guest request platform device
Date: Tue, 1 Feb 2022 13:21:47 -0700 [thread overview]
Message-ID: <CAMkAt6rfTbQB8kZp1Nkh7GpEsWXETAPNoEOhqiMx7o68ZHgjww@mail.gmail.com> (raw)
In-Reply-To: <20220128171804.569796-41-brijesh.singh@amd.com>
On Fri, Jan 28, 2022 at 10:19 AM Brijesh Singh <brijesh.singh@amd.com> wrote:
>
> Version 2 of GHCB specification provides Non Automatic Exit (NAE) that can
> be used by the SEV-SNP guest to communicate with the PSP without risk from
> a malicious hypervisor who wishes to read, alter, drop or replay the
> messages sent.
>
> SNP_LAUNCH_UPDATE can insert two special pages into the guest’s memory:
> the secrets page and the CPUID page. The PSP firmware populate the contents
> of the secrets page. The secrets page contains encryption keys used by the
> guest to interact with the firmware. Because the secrets page is encrypted
> with the guest’s memory encryption key, the hypervisor cannot read the
> keys. See SEV-SNP firmware spec for further details on the secrets page
> format.
>
> Create a platform device that the SEV-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 SEV-SNP guest driver provides a userspace
> interface to get the attestation report, key derivation, extended
> attestation report etc.
>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
> arch/x86/include/asm/sev.h | 4 +++
> arch/x86/kernel/sev.c | 61 ++++++++++++++++++++++++++++++++++++++
> 2 files changed, 65 insertions(+)
>
> diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
> index 9830ee1d6ef0..ca977493eb72 100644
> --- a/arch/x86/include/asm/sev.h
> +++ b/arch/x86/include/asm/sev.h
> @@ -95,6 +95,10 @@ struct snp_req_data {
> unsigned int data_npages;
> };
>
> +struct snp_guest_platform_data {
> + u64 secrets_gpa;
> +};
> +
> #ifdef CONFIG_AMD_MEM_ENCRYPT
> extern struct static_key_false sev_es_enable_key;
> extern void __sev_es_ist_enter(struct pt_regs *regs);
> diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
> index 1d3ac83226fc..1e56ab00d1f4 100644
> --- a/arch/x86/kernel/sev.c
> +++ b/arch/x86/kernel/sev.c
> @@ -19,6 +19,9 @@
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/cpumask.h>
> +#include <linux/efi.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
>
> #include <asm/cpu_entry_area.h>
> #include <asm/stacktrace.h>
> @@ -34,6 +37,7 @@
> #include <asm/cpu.h>
> #include <asm/apic.h>
> #include <asm/cpuid.h>
> +#include <asm/setup.h>
>
> #define DR7_RESET_VALUE 0x400
>
> @@ -2177,3 +2181,60 @@ int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned
> return ret;
> }
> EXPORT_SYMBOL_GPL(snp_issue_guest_request);
> +
> +static struct platform_device guest_req_device = {
> + .name = "snp-guest",
> + .id = -1,
> +};
> +
> +static u64 get_secrets_page(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));
> +
> + /* smoke-test the secrets page passed */
> + if (!info.secrets_phys || info.secrets_len != PAGE_SIZE)
> + return 0;
This seems like an error condition worth noting. If no cc_blob_address
is passed it makes sense not to log but what if the address passed
fails this smoke test, why not log?
> +
> + return info.secrets_phys;
> +}
> +
> +static int __init init_snp_platform_device(void)
> +{
> + struct snp_guest_platform_data data;
> + u64 gpa;
> +
> + if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
> + return -ENODEV;
> +
> + gpa = get_secrets_page();
> + if (!gpa)
> + return -ENODEV;
> +
> + data.secrets_gpa = gpa;
> + if (platform_device_add_data(&guest_req_device, &data, sizeof(data)))
> + goto e_fail;
> +
> + if (platform_device_register(&guest_req_device))
> + goto e_fail;
> +
> + pr_info("SNP guest platform device initialized.\n");
> + return 0;
> +
> +e_fail:
> + pr_err("Failed to initialize SNP guest device\n");
> + return -ENODEV;
> +}
> +device_initcall(init_snp_platform_device);
> --
> 2.25.1
>
next prev parent reply other threads:[~2022-02-01 20:22 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 17:17 [PATCH v9 00/43] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 01/43] KVM: SVM: Define sev_features and vmpl field in the VMSA Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 02/43] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
[not found] ` <YfkvchuxmkHgnPWT@zn.tnic>
2022-02-09 15:02 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 03/43] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 04/43] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 05/43] x86/compressed/64: Detect/setup SEV/SME features earlier in boot Brijesh Singh
[not found] ` <Yfl3FaTGPxE7qMCq@zn.tnic>
2022-02-01 20:35 ` Michael Roth
[not found] ` <YfmmBykN2s0HsiAJ@zn.tnic>
2022-02-02 0:52 ` Michael Roth
[not found] ` <YfogFFOoHvCV+/2Y@zn.tnic>
2022-02-02 17:28 ` Michael Roth
2022-01-28 17:17 ` [PATCH v9 06/43] x86/sev: " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 07/43] x86/mm: Extend cc_attr to include AMD SEV-SNP Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 08/43] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 09/43] x86/sev: Save the negotiated GHCB version Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 10/43] x86/sev: Check SEV-SNP features support Brijesh Singh
[not found] ` <YfmRBUtoWNb9BkuL@zn.tnic>
2022-02-02 14:28 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 11/43] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 12/43] x86/sev: Check the vmpl level Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 13/43] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 14/43] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 15/43] x86/sev: " Brijesh Singh
[not found] ` <YfpeSErxB9KHOd7m@zn.tnic>
2022-02-02 14:29 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 16/43] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 17/43] x86/kernel: Make the .bss..decrypted section shared in RMP table Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 18/43] x86/kernel: Validate ROM memory before accessing when SEV-SNP is active Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 19/43] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 20/43] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 21/43] x86/head/64: Re-enable stack protection Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 22/43] x86/sev: Move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 23/43] KVM: x86: Move lookup of indexed CPUID leafs " Brijesh Singh
[not found] ` <Yfvx0Rq8Tydyr/RO@zn.tnic>
2022-02-03 16:44 ` Michael Roth
2022-01-28 17:17 ` [PATCH v9 24/43] x86/compressed/acpi: Move EFI detection " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 25/43] x86/compressed/acpi: Move EFI system table lookup " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 26/43] x86/compressed/acpi: Move EFI config " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 27/43] x86/compressed/acpi: Move EFI vendor " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 28/43] x86/compressed/acpi: Move EFI kexec handling into common code Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 29/43] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
[not found] ` <Yf1Sn4AdPgIzpih9@zn.tnic>
2022-02-04 17:41 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 30/43] KVM: SEV: Add documentation for SEV-SNP CPUID Enforcement Brijesh Singh
2022-02-07 23:48 ` Sean Christopherson
2022-02-08 14:54 ` Michael Roth
2022-02-08 15:11 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 31/43] x86/compressed/64: Add support for SEV-SNP CPUID table in #VC handlers Brijesh Singh
[not found] ` <Yf5XScto3mDXnl9u@zn.tnic>
2022-02-05 15:42 ` Michael Roth
2022-02-05 16:22 ` Michael Roth
[not found] ` <Yf/PN8rBy3m5seU9@zn.tnic>
2022-02-07 15:37 ` Michael Roth
2022-01-28 17:17 ` [PATCH v9 32/43] x86/boot: Add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 33/43] x86/compressed: Add SEV-SNP feature detection/setup Brijesh Singh
[not found] ` <Yf/6NhnS50UDv4xV@zn.tnic>
2022-02-08 13:50 ` Michael Roth
2022-02-08 15:02 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 34/43] x86/compressed: Use firmware-validated CPUID leaves for SEV-SNP guests Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 35/43] x86/compressed: Export and rename add_identity_map() Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 36/43] x86/compressed/64: Add identity mapping for Confidential Computing blob Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 37/43] x86/sev: Add SEV-SNP feature detection/setup Brijesh Singh
[not found] ` <YgAjq3mSudt+G+6Y@zn.tnic>
2022-02-08 5:25 ` Michael Roth
2022-01-28 17:17 ` [PATCH v9 38/43] x86/sev: Use firmware-validated CPUID for SEV-SNP guests Brijesh Singh
2022-02-05 17:19 ` Michael Roth
[not found] ` <Yf/tQPqbP97lrVpg@zn.tnic>
2022-02-07 17:00 ` Michael Roth
2022-01-28 17:18 ` [PATCH v9 39/43] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2022-02-01 20:17 ` Peter Gonda
2022-03-03 14:53 ` Brijesh Singh
2022-01-28 17:18 ` [PATCH v9 40/43] x86/sev: Register SEV-SNP guest request platform device Brijesh Singh
2022-02-01 20:21 ` Peter Gonda [this message]
2022-02-02 16:27 ` Brijesh Singh
2022-01-28 17:18 ` [PATCH v9 41/43] virt: Add SEV-SNP guest driver Brijesh Singh
2022-02-01 20:33 ` Peter Gonda
2022-02-06 22:39 ` Borislav Petkov
2022-02-07 14:41 ` Brijesh Singh
2022-01-28 17:18 ` [PATCH v9 42/43] virt: sevguest: Add support to derive key Brijesh Singh
2022-02-01 20:39 ` Peter Gonda
2022-02-02 22:31 ` Brijesh Singh
[not found] ` <YgDduR0mrptX5arB@zn.tnic>
2022-02-07 16:23 ` Brijesh Singh
2022-02-07 19:09 ` Dov Murik
2022-02-07 20:08 ` Brijesh Singh
2022-02-08 7:56 ` Dov Murik
2022-02-08 10:51 ` Borislav Petkov
2022-02-08 14:14 ` Brijesh Singh
2022-01-28 17:18 ` [PATCH v9 43/43] virt: sevguest: Add support to get extended report Brijesh Singh
2022-02-01 20:43 ` Peter Gonda
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