From 2c07ded06427dd3339278487a1413d5e478f05f9 Mon Sep 17 00:00:00 2001 From: Brijesh Singh Date: Mon, 4 Jan 2021 09:17:49 -0600 Subject: KVM/SVM: add support for SEV attestation command The SEV FW version >= 0.23 added a new command that can be used to query the attestation report containing the SHA-256 digest of the guest memory encrypted through the KVM_SEV_LAUNCH_UPDATE_{DATA, VMSA} commands and sign the report with the Platform Endorsement Key (PEK). See the SEV FW API spec section 6.8 for more details. Note there already exist a command (KVM_SEV_LAUNCH_MEASURE) that can be used to get the SHA-256 digest. The main difference between the KVM_SEV_LAUNCH_MEASURE and KVM_SEV_ATTESTATION_REPORT is that the latter can be called while the guest is running and the measurement value is signed with PEK. Cc: James Bottomley Cc: Tom Lendacky Cc: David Rientjes Cc: Paolo Bonzini Cc: Sean Christopherson Cc: Borislav Petkov Cc: John Allen Cc: Herbert Xu Cc: linux-crypto@vger.kernel.org Reviewed-by: Tom Lendacky Acked-by: David Rientjes Tested-by: James Bottomley Signed-off-by: Brijesh Singh Message-Id: <20210104151749.30248-1-brijesh.singh@amd.com> Signed-off-by: Paolo Bonzini --- drivers/crypto/ccp/sev-dev.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/crypto/ccp') diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 476113e12489..cb9b4c4e371e 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -128,6 +128,7 @@ static int sev_cmd_buffer_len(int cmd) case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret); case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware); case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id); + case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report); default: return 0; } -- cgit v1.2.3