Messages in this thread Patch in this message | | | From | Tom Lendacky <> | Subject | [PATCH v3 10/14] configfs-tsm: Allow the privlevel_floor attribute to be updated | Date | Mon, 25 Mar 2024 17:26:29 -0500 |
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With the introduction of an SVSM, Linux will be running at a non-zero VMPL. Any request for an attestation report at a higher priviledge VMPL than what Linux is currently running will result in an error. Allow for the privlevel_floor attribute to be updated dynamically so that the attribute may be set dynamically.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- drivers/virt/coco/sev-guest/sev-guest.c | 5 ++++- include/linux/tsm.h | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c index 1ff897913bf4..bba6531cb606 100644 --- a/drivers/virt/coco/sev-guest/sev-guest.c +++ b/drivers/virt/coco/sev-guest/sev-guest.c @@ -885,7 +885,7 @@ static int sev_report_new(struct tsm_report *report, void *data) return 0; } -static const struct tsm_ops sev_tsm_ops = { +static struct tsm_ops sev_tsm_ops = { .name = KBUILD_MODNAME, .report_new = sev_report_new, }; @@ -972,6 +972,9 @@ static int __init sev_guest_probe(struct platform_device *pdev) snp_dev->input.resp_gpa = __pa(snp_dev->response); snp_dev->input.data_gpa = __pa(snp_dev->certs_data); + /* Set the privlevel_floor attribute based on the current VMPL */ + sev_tsm_ops.privlevel_floor = snp_get_vmpl(); + ret = tsm_register(&sev_tsm_ops, snp_dev, &tsm_report_extra_type); if (ret) goto e_free_cert_data; diff --git a/include/linux/tsm.h b/include/linux/tsm.h index de8324a2223c..50c5769657d8 100644 --- a/include/linux/tsm.h +++ b/include/linux/tsm.h @@ -54,7 +54,7 @@ struct tsm_report { */ struct tsm_ops { const char *name; - const unsigned int privlevel_floor; + unsigned int privlevel_floor; int (*report_new)(struct tsm_report *report, void *data); }; -- 2.43.2
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