From: Tom Lendacky <thomas.lendacky@amd.com>
To: 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>,
Joel Becker <jlbec@evilplan.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 12/14] fs/configfs: Add a callback to determine attribute visibility
Date: Tue, 16 Apr 2024 11:01:48 -0500 [thread overview]
Message-ID: <7fc4e7d4-dfa8-b626-76c7-1f8993304a2d@amd.com> (raw)
In-Reply-To: <661e10a01f1d8_4d561294d0@dwillia2-mobl3.amr.corp.intel.com.notmuch>
On 4/16/24 00:46, Dan Williams wrote:
> Tom Lendacky wrote:
>> In order to support dynamic decisions as to whether an attribute should be
>> created, add a callback that returns a bool to indicate whether the
>> attribute should be display. If no callback is registered, the attribute
>
> s/display/displayed/
Will fix.
>
>> is displayed by default.
>>
>> Cc: Joel Becker <jlbec@evilplan.org>
>> Cc: Christoph Hellwig <hch@lst.de>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
>> ---
>> fs/configfs/file.c | 7 +++
>> include/linux/configfs.h | 111 +++++++++++++++++++++++++++------------
>> 2 files changed, 84 insertions(+), 34 deletions(-)
>>
>> diff --git a/fs/configfs/file.c b/fs/configfs/file.c
>> index 0ad32150611e..a976c183756c 100644
>> --- a/fs/configfs/file.c
>> +++ b/fs/configfs/file.c
>> @@ -451,6 +451,9 @@ int configfs_create_file(struct config_item * item, const struct configfs_attrib
>> umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
>> int error = 0;
>>
>> + if (attr->is_visible && !attr->is_visible(item, attr))
>> + return 0;
>> +
>> inode_lock_nested(d_inode(dir), I_MUTEX_NORMAL);
>> error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode,
>> CONFIGFS_ITEM_ATTR, parent_sd->s_frag);
>> @@ -470,9 +473,13 @@ int configfs_create_bin_file(struct config_item *item,
>> {
>> struct dentry *dir = item->ci_dentry;
>> struct configfs_dirent *parent_sd = dir->d_fsdata;
>> + const struct configfs_attribute *attr = &bin_attr->cb_attr;
>> umode_t mode = (bin_attr->cb_attr.ca_mode & S_IALLUGO) | S_IFREG;
>> int error = 0;
>>
>> + if (attr->is_visible && !attr->is_visible(item, attr))
>> + return 0;
>> +
>> inode_lock_nested(dir->d_inode, I_MUTEX_NORMAL);
>> error = configfs_make_dirent(parent_sd, NULL, (void *) bin_attr, mode,
>> CONFIGFS_ITEM_BIN_ATTR, parent_sd->s_frag);
>> diff --git a/include/linux/configfs.h b/include/linux/configfs.h
>> index 2606711adb18..c836d7bc7c9e 100644
>> --- a/include/linux/configfs.h
>> +++ b/include/linux/configfs.h
>> @@ -116,35 +116,57 @@ struct configfs_attribute {
>> const char *ca_name;
>> struct module *ca_owner;
>> umode_t ca_mode;
>> + bool (*is_visible)(const struct config_item *, const struct configfs_attribute *);
>> ssize_t (*show)(struct config_item *, char *);
>> ssize_t (*store)(struct config_item *, const char *, size_t);
>> };
>>
>> -#define CONFIGFS_ATTR(_pfx, _name) \
>> +#define __CONFIGFS_ATTR(_pfx, _name, _vis) \
>> static struct configfs_attribute _pfx##attr_##_name = { \
>> .ca_name = __stringify(_name), \
>> .ca_mode = S_IRUGO | S_IWUSR, \
>> .ca_owner = THIS_MODULE, \
>> + .is_visible = _vis, \
>> .show = _pfx##_name##_show, \
>> .store = _pfx##_name##_store, \
>
> Shouldn't this operation live in configfs_group_operations? That would
> mirror the sysfs organization, and likely saves some memory.
I suppose it can, but then you lose the grouping of attributes within
the same directory, right? A configfs group will result in moving the
entries into a subdirectory, right? If we go with the group level, then
we will be moving the existing TSM extra attributes and the new TSM SVSM
attributes into new, separate sub-directories.
Thanks,
Tom
next prev parent reply other threads:[~2024-04-16 16:02 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 [this message]
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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