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    Subject[PATCH v3 10/14] configfs-tsm: Allow the privlevel_floor attribute to be updated
    Date
    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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