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From: Dan Williams <dan.j.williams@intel.com>
To: Tom Lendacky <thomas.lendacky@amd.com>,
	Kuppuswamy Sathyanarayanan
	<sathyanarayanan.kuppuswamy@linux.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>,
	Dan Williams <dan.j.williams@intel.com>,
	Michael Roth <michael.roth@amd.com>,
	Ashish Kalra <ashish.kalra@amd.com>,
	Joel Becker <jlbec@evilplan.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 13/14] x86/sev: Hide SVSM attestation entries if not running under an SVSM
Date: Mon, 15 Apr 2024 23:05:29 -0700	[thread overview]
Message-ID: <661e15292be3_4d561294d6@dwillia2-mobl3.amr.corp.intel.com.notmuch> (raw)
In-Reply-To: <e286883d-40ef-d749-26a8-7ec6fbd81eae@amd.com>

Tom Lendacky wrote:
> On 4/12/24 10:52, Tom Lendacky wrote:
> > On 4/9/24 13:12, Kuppuswamy Sathyanarayanan wrote:
> >> On 3/25/24 3:26 PM, Tom Lendacky wrote:
> >>> Config-fs provides support to hide individual attribute entries. Using
> >>> this support, base the display of the SVSM related entries on the 
> >>> presence
> >>> of an SVSM.
> >>>
> >>> Cc: Joel Becker <jlbec@evilplan.org>
> >>> Cc: Christoph Hellwig <hch@lst.de>
> >>> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> >>> ---
> >>>   arch/x86/coco/core.c        |  4 ++++
> >>>   drivers/virt/coco/tsm.c     | 14 ++++++++++----
> >>>   include/linux/cc_platform.h |  8 ++++++++
> >>>   3 files changed, 22 insertions(+), 4 deletions(-)
> >>>
> 
> >>
> >> Any comment about the following query? I think introducing a CC flag 
> >> for this use
> >> case is over kill.
> >>
> >> https://lore.kernel.org/lkml/6b90b223-46e0-4e6d-a17c-5caf72e3c949@linux.intel.com/
> > 
> > If you don't think TDX will be able to make use of the SVSM attribute I 
> > can look at adding a callback. But I was waiting to see if anyone else 
> > had comments, for or against, before re-doing it all.
> > 
> 
> What about something like this (applied on top of patch 13):
> 
> diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
> index efa0f648f754..d07be9d05cd0 100644
> --- a/arch/x86/coco/core.c
> +++ b/arch/x86/coco/core.c
> @@ -12,7 +12,6 @@
>   
>   #include <asm/coco.h>
>   #include <asm/processor.h>
> -#include <asm/sev.h>
>   
>   enum cc_vendor cc_vendor __ro_after_init = CC_VENDOR_NONE;
>   u64 cc_mask __ro_after_init;
> @@ -79,9 +78,6 @@ static bool noinstr amd_cc_platform_has(enum cc_attr attr)
>   	case CC_ATTR_GUEST_STATE_ENCRYPT:
>   		return sev_status & MSR_AMD64_SEV_ES_ENABLED;
>   
> -	case CC_ATTR_GUEST_SVSM_PRESENT:
> -		return snp_get_vmpl();
> -
>   	/*
>   	 * With SEV, the rep string I/O instructions need to be unrolled
>   	 * but SEV-ES supports them through the #VC handler.
> diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
> index 0d2c9926a97c..68c881a50026 100644
> --- a/drivers/virt/coco/sev-guest/sev-guest.c
> +++ b/drivers/virt/coco/sev-guest/sev-guest.c
> @@ -1036,6 +1036,17 @@ static int sev_report_new(struct tsm_report *report, void *data)
>   	return 0;
>   }
>   
> +static bool sev_tsm_visibility(enum tsm_type type)
> +{
> +	/* Check for SVSM-related attributes */
> +	switch (type) {
> +	case TSM_TYPE_SERVICE_PROVIDER:
> +		return snp_get_vmpl();
> +	default:
> +		return false;
> +	}
> +}
> +
>   static struct tsm_ops sev_tsm_ops = {
>   	.name = KBUILD_MODNAME,
>   	.report_new = sev_report_new,
> @@ -1126,7 +1137,8 @@ static int __init sev_guest_probe(struct platform_device *pdev)
>   	/* 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);
> +	ret = tsm_register(&sev_tsm_ops, snp_dev, &tsm_report_extra_type,
> +			   sev_tsm_visibility);

I would have expected this in tsm_ops, but yes I think a callback lets
this fixup the ugly "extra" attributes situation as well.

  parent reply	other threads:[~2024-04-16  6:05 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
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 [this message]
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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