From: Dan Williams <dan.j.williams@intel.com>
To: Tom Lendacky <thomas.lendacky@amd.com>,
Dan Williams <dan.j.williams@intel.com>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<linux-coco@lists.linux.dev>, <svsm-devel@coconut-svsm.dev>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
"Peter Zijlstra" <peterz@infradead.org>,
Michael Roth <michael.roth@amd.com>,
Ashish Kalra <ashish.kalra@amd.com>
Subject: Re: [PATCH v3 10/14] configfs-tsm: Allow the privlevel_floor attribute to be updated
Date: Tue, 16 Apr 2024 08:57:59 -0700 [thread overview]
Message-ID: <661ea007d1844_4d5612948c@dwillia2-mobl3.amr.corp.intel.com.notmuch> (raw)
In-Reply-To: <061802e1-7c95-f1f0-b462-3aca27583d76@amd.com>
Tom Lendacky wrote:
> On 4/15/24 23:55, Dan Williams wrote:
> > 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@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();
> >
> > Why is this not vmpck_id?
>
> Good catch, this probably should be pulled out separately and submitted
> as a Fixes: against the current support. If you think it's important
> enough, I can do that and put this at the beginning of the series. Or I
> can just modify this to use the vmpck_id value. Any preference?
I dunno, you tell me. What breaks if privlevel_floor is mismatched vs
vmpl and/or vmpck_id? If it warrants a "Fixes:" it should probably be
broken out.
However, I *guess* it is just adding some sanity checking precision to
userspace requests and makes some input validation not catch errors when
userspace tries to generate reports from the wrong level, right? I.e.
privlevel_floor may be lower than expected, but userspace should not be
depending on that since the report generation will fail.
next prev parent reply other threads:[~2024-04-16 15:58 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 22:26 [PATCH v3 00/14] Provide SEV-SNP support for running under an SVSM Tom Lendacky
2024-03-25 22:26 ` [PATCH v3 01/14] x86/sev: Rename snp_init() in the boot/compressed/sev.c file Tom Lendacky
2024-04-09 17:09 ` Borislav Petkov
2024-04-09 17:44 ` Tom Lendacky
2024-04-09 17:57 ` Borislav Petkov
2024-04-12 16:19 ` Gupta, Pankaj
2024-03-25 22:26 ` [PATCH v3 02/14] x86/sev: Make the VMPL0 checking function more generic Tom Lendacky
2024-04-12 16:41 ` Gupta, Pankaj
2024-04-17 11:46 ` Borislav Petkov
2024-04-17 20:35 ` Tom Lendacky
2024-04-17 20:50 ` Borislav Petkov
2024-04-18 18:38 ` Tom Lendacky
2024-04-21 7:12 ` Borislav Petkov
2024-03-25 22:26 ` [PATCH v3 03/14] x86/sev: Check for the presence of an SVSM in the SNP Secrets page Tom Lendacky
2024-04-12 17:03 ` Gupta, Pankaj
2024-04-17 20:40 ` Borislav Petkov
2024-04-18 21:17 ` Tom Lendacky
2024-04-22 22:07 ` Borislav Petkov
2024-03-25 22:26 ` [PATCH v3 04/14] x86/sev: Use kernel provided SVSM Calling Areas Tom Lendacky
2024-04-12 16:04 ` Gupta, Pankaj
2024-03-25 22:26 ` [PATCH v3 05/14] x86/sev: Perform PVALIDATE using the SVSM when not at VMPL0 Tom Lendacky
2024-03-25 22:26 ` [PATCH v3 06/14] x86/sev: Use the SVSM to create a vCPU when not in VMPL0 Tom Lendacky
2024-04-12 15:28 ` Gupta, Pankaj
2024-03-25 22:26 ` [PATCH v3 07/14] x86/sev: Provide SVSM discovery support Tom Lendacky
2024-04-15 16:12 ` Gupta, Pankaj
2024-03-25 22:26 ` [PATCH v3 08/14] x86/sev: Provide guest VMPL level to userspace Tom Lendacky
2024-03-25 22:26 ` [PATCH v3 09/14] virt: sev-guest: Choose the VMPCK key based on executing VMPL Tom Lendacky
2024-04-16 4:54 ` Dan Williams
2024-04-16 15:17 ` Tom Lendacky
2024-04-16 15:47 ` Dan Williams
2024-03-25 22:26 ` [PATCH v3 10/14] configfs-tsm: Allow the privlevel_floor attribute to be updated Tom Lendacky
2024-04-16 4:55 ` Dan Williams
2024-04-16 15:23 ` Tom Lendacky
2024-04-16 15:57 ` Dan Williams [this message]
2024-04-16 16:17 ` Tom Lendacky
2024-03-25 22:26 ` [PATCH v3 11/14] x86/sev: Extend the config-fs attestation support for an SVSM Tom Lendacky
2024-04-16 5:37 ` Dan Williams
2024-04-16 15:53 ` Tom Lendacky
2024-04-16 16:19 ` Dan Williams
2024-03-25 22:26 ` [PATCH v3 12/14] fs/configfs: Add a callback to determine attribute visibility Tom Lendacky
2024-04-16 5:46 ` Dan Williams
2024-04-16 16:01 ` Tom Lendacky
2024-04-16 18:25 ` Dan Williams
2024-04-16 19:54 ` Tom Lendacky
2024-04-16 20:03 ` Dan Williams
2024-03-25 22:26 ` [PATCH v3 13/14] x86/sev: Hide SVSM attestation entries if not running under an SVSM Tom Lendacky
2024-04-09 18:12 ` Kuppuswamy Sathyanarayanan
2024-04-12 15:52 ` Tom Lendacky
2024-04-15 19:16 ` Tom Lendacky
2024-04-15 19:48 ` Kuppuswamy Sathyanarayanan
2024-04-15 20:13 ` Tom Lendacky
2024-04-15 21:50 ` Kuppuswamy Sathyanarayanan
2024-04-15 22:03 ` Tom Lendacky
2024-04-16 6:09 ` Dan Williams
2024-04-16 6:08 ` Dan Williams
2024-04-16 6:05 ` Dan Williams
2024-04-16 5:47 ` Dan Williams
2024-04-16 16:07 ` Tom Lendacky
2024-04-16 6:03 ` Dan Williams
2024-04-16 16:10 ` Tom Lendacky
2024-03-25 22:26 ` [PATCH v3 14/14] x86/sev: Allow non-VMPL0 execution when an SVSM is present Tom Lendacky
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