kernel/linux.git/include/linux/psp-sev.h, branch v6.18.21

crypto: ccp - Add support to enable CipherTextHiding on SNP_INIT_EX

2025-08-16T09:20:23+00:00

To enable ciphertext hiding, it must be specified in the SNP_INIT_EX command as part of SNP initialization. Modify the sev_platform_init_args structure, which is used as input to sev_platform_init(), to include a field that, when non-zero, indicates that ciphertext hiding should be enabled and specifies the maximum ASID that can be used for an SEV-SNP guest. Reviewed-by: Tom Lendacky Signed-off-by: Ashish Kalra Reviewed-by: Kim Phillips Signed-off-by: Herbert Xu

crypto: ccp - Introduce new API interface to indicate SEV-SNP Ciphertext hiding feature

2025-08-16T09:20:23+00:00

Implement an API that checks the overall feature support for SEV-SNP ciphertext hiding. This API verifies both the support of the SEV firmware for the feature and its enablement in the platform's BIOS. Reviewed-by: Tom Lendacky Signed-off-by: Ashish Kalra Reviewed-by: Kim Phillips Signed-off-by: Herbert Xu

crypto: ccp - Add support for SNP_FEATURE_INFO command

2025-08-16T09:20:23+00:00

The FEATURE_INFO command provides hypervisors with a programmatic means to learn about the supported features of the currently loaded firmware. This command mimics the CPUID instruction relative to sub-leaf input and the four unsigned integer output values. To obtain information regarding the features present in the currently loaded SEV firmware, use the SNP_FEATURE_INFO command. Cache the SNP platform status and feature information from CPUID 0x8000_0024 in the sev_device structure. If SNP is enabled, utilize this cached SNP platform status for the API major, minor and build version. Reviewed-by: Tom Lendacky Signed-off-by: Ashish Kalra Reviewed-by: Kim Phillips Signed-off-by: Herbert Xu

KVM: SVM: Add missing member in SNP_LAUNCH_START command structure

2025-06-25T14:27:27+00:00

The sev_data_snp_launch_start structure should include a 4-byte desired_tsc_khz field before the gosvw field, which was missed in the initial implementation. As a result, the structure is 4 bytes shorter than expected by the firmware, causing the gosvw field to start 4 bytes early. Fix this by adding the missing 4-byte member for the desired TSC frequency. Fixes: 3a45dc2b419e ("crypto: ccp: Define the SEV-SNP commands") Cc: stable@vger.kernel.org Suggested-by: Tom Lendacky Reviewed-by: Tom Lendacky Tested-by: Vaishali Thakkar Signed-off-by: Nikunj A Dadhania Link: https://lore.kernel.org/r/20250408093213.57962-3-nikunj@amd.com Signed-off-by: Sean Christopherson

crypto: ccp - Add new SEV/SNP platform shutdown API

2025-04-07T05:22:26+00:00

Add new API interface to do SEV/SNP platform shutdown when KVM module is unloaded. Reviewed-by: Dionna Glaze Reviewed-by: Tom Lendacky Signed-off-by: Ashish Kalra Signed-off-by: Herbert Xu

crypto: ccp: Add external API interface for PSP module initialization

2025-02-14T23:39:19+00:00

KVM is dependent on the PSP SEV driver and PSP SEV driver needs to be loaded before KVM module. In case of module loading any dependent modules are automatically loaded but in case of built-in modules there is no inherent mechanism available to specify dependencies between modules and ensure that any dependent modules are loaded implicitly. Add a new external API interface for PSP module initialization which allows PSP SEV driver to be loaded explicitly if KVM is built-in. Signed-off-by: Sean Christopherson Co-developed-by: Ashish Kalra Signed-off-by: Ashish Kalra Reviewed-by: Tom Lendacky Message-ID: <15279ca0cad56a07cf12834ec544310f85ff5edc.1739226950.git.ashish.kalra@amd.com> Signed-off-by: Paolo Bonzini

KVM: SEV: Add KVM_SEV_SNP_LAUNCH_FINISH command

2024-05-12T08:09:30+00:00

Add a KVM_SEV_SNP_LAUNCH_FINISH command to finalize the cryptographic launch digest which stores the measurement of the guest at launch time. Also extend the existing SNP firmware data structures to support disabling the use of Versioned Chip Endorsement Keys (VCEK) by guests as part of this command. While finalizing the launch flow, the code also issues the LAUNCH_UPDATE SNP firmware commands to encrypt/measure the initial VMSA pages for each configured vCPU, which requires setting the RMP entries for those pages to private, so also add handling to clean up the RMP entries for these pages whening freeing vCPUs during shutdown. Signed-off-by: Brijesh Singh Co-developed-by: Michael Roth Signed-off-by: Michael Roth Signed-off-by: Harald Hoyer Signed-off-by: Ashish Kalra Message-ID: <20240501085210.2213060-8-michael.roth@amd.com> Signed-off-by: Paolo Bonzini

crypto: ccp: Add the SNP_COMMIT command

2024-01-29T19:34:19+00:00

The SNP_COMMIT command is used to commit the currently installed version of the SEV firmware. Once committed, the firmware cannot be replaced with a previous firmware version (cannot be rolled back). This command will also update the reported TCB to match that of the currently installed firmware. [ mdr: Note the reported TCB update in the documentation/commit. ] Signed-off-by: Tom Lendacky Signed-off-by: Michael Roth Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20240126041126.1927228-25-michael.roth@amd.com

crypto: ccp: Handle the legacy TMR allocation when SNP is enabled

2024-01-29T19:34:18+00:00

The behavior and requirement for the SEV-legacy command is altered when the SNP firmware is in the INIT state. See SEV-SNP firmware ABI specification for more details. Allocate the Trusted Memory Region (TMR) as a 2MB-sized/aligned region when SNP is enabled to satisfy new requirements for SNP. Continue allocating a 1MB-sized region for !SNP configuration. [ bp: Carve out TMR allocation into a helper. ] Signed-off-by: Brijesh Singh Co-developed-by: Ashish Kalra Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20240126041126.1927228-17-michael.roth@amd.com

crypto: ccp: Provide an API to issue SEV and SNP commands

2024-01-29T19:34:18+00:00

Export sev_do_cmd() as a generic API for the hypervisor to issue commands to manage an SEV or an SNP guest. The commands for SEV and SNP are defined in the SEV and SEV-SNP firmware specifications. Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20240126041126.1927228-15-michael.roth@amd.com