linux-kernel - Re: [PATCH v3 10/14] configfs-tsm: Allow the privlevel

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Date: Mon, 15 Apr 2024 21:55:41 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Tom Lendacky <thomas.lendacky@....com>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, <linux-coco@...ts.linux.dev>, <svsm-devel@...onut-svsm.dev>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, Dan Williams <dan.j.williams@...el.com>,
	Michael Roth <michael.roth@....com>, Ashish Kalra <ashish.kalra@....com>
Subject: Re: [PATCH v3 10/14] configfs-tsm: Allow the privlevel_floor
 attribute to be updated

Tom Lendacky wrote:
> 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@....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();

Why is this not vmpck_id?