x86/sev: Add SVSM vTPM probe/send_command functions

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Add two new functions to probe and send commands to the SVSM vTPM. They
leverage the two calls defined by the AMD SVSM specification [1] for the vTPM
protocol: SVSM_VTPM_QUERY and SVSM_VTPM_CMD.

Expose snp_svsm_vtpm_send_command() to be used by a TPM driver.

  [1] "Secure VM Service Module for SEV-SNP Guests"
      Publication # 58019 Revision: 1.00

  [ bp: Some doc touchups. ]

Co-developed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Co-developed-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20250403100943.120738-2-sgarzare@redhat.com

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Stefano Garzarella 2025-04-03 12:09:39 +02:00 • committed by Borislav Petkov (AMD)

parent 0af2f6be1b

commit 770de678bc

2 changed files with 65 additions and 0 deletions

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58

arch/x86/coco/sev/core.c

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7

arch/x86/include/asm/sev.h

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