From: Jane Chu <jane.chu@oracle.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "david@fromorbit.com" <david@fromorbit.com>,
"djwong@kernel.org" <djwong@kernel.org>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"vishal.l.verma@intel.com" <vishal.l.verma@intel.com>,
"dave.jiang@intel.com" <dave.jiang@intel.com>,
"agk@redhat.com" <agk@redhat.com>,
"snitzer@redhat.com" <snitzer@redhat.com>,
"dm-devel@redhat.com" <dm-devel@redhat.com>,
"ira.weiny@intel.com" <ira.weiny@intel.com>,
"willy@infradead.org" <willy@infradead.org>,
"vgoyal@redhat.com" <vgoyal@redhat.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"nvdimm@lists.linux.dev" <nvdimm@lists.linux.dev>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>
Subject: Re: [PATCH v5 1/7] mce: fix set_mce_nospec to always unmap the whole page
Date: Wed, 2 Feb 2022 21:20:36 +0000 [thread overview]
Message-ID: <d0fecaaa-8613-92d2-716d-9d462dbd3888@oracle.com> (raw)
In-Reply-To: <YfqFWjFcdJSwjRaU@infradead.org>
On 2/2/2022 5:21 AM, Christoph Hellwig wrote:
>> +static inline int set_mce_nospec(unsigned long pfn)
>> {
>> unsigned long decoy_addr;
>> int rc;
>> @@ -117,10 +113,7 @@ static inline int set_mce_nospec(unsigned long pfn, bool unmap)
>> */
>> decoy_addr = (pfn << PAGE_SHIFT) + (PAGE_OFFSET ^ BIT(63));
>>
>> - if (unmap)
>> - rc = set_memory_np(decoy_addr, 1);
>> - else
>> - rc = set_memory_uc(decoy_addr, 1);
>> + rc = set_memory_np(decoy_addr, 1);
>> if (rc)
>> pr_warn("Could not invalidate pfn=0x%lx from 1:1 map\n", pfn);
>> return rc;
>> @@ -130,7 +123,7 @@ static inline int set_mce_nospec(unsigned long pfn, bool unmap)
>> /* Restore full speculative operation to the pfn. */
>> static inline int clear_mce_nospec(unsigned long pfn)
>> {
>> - return set_memory_wb((unsigned long) pfn_to_kaddr(pfn), 1);
>> + return _set_memory_present((unsigned long) pfn_to_kaddr(pfn), 1);
>> }
>
> Wouldn't it make more sense to move these helpers out of line rather
> than exporting _set_memory_present?
Do you mean to move
return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_PRESENT), 0);
into clear_mce_nospec() for the x86 arch and get rid of _set_memory_present?
If so, sure I'll do that.
>
>> /*
>> - * _set_memory_prot is an internal helper for callers that have been passed
>> + * __set_memory_prot is an internal helper for callers that have been passed
>
> This looks unrelated to the patch.
My bad, will remove the remnant.
thanks!
-jane
next prev parent reply other threads:[~2022-02-02 21:20 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 21:31 [PATCH v5 0/7] DAX poison recovery Jane Chu
2022-01-28 21:31 ` [PATCH v5 1/7] mce: fix set_mce_nospec to always unmap the whole page Jane Chu
2022-02-02 13:21 ` Christoph Hellwig
2022-02-02 21:20 ` Jane Chu [this message]
2022-02-02 23:07 ` Jane Chu
2022-02-03 13:42 ` Christoph Hellwig
2022-02-04 5:23 ` Dan Williams
2022-02-06 8:30 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 2/7] dax: introduce dax device flag DAXDEV_RECOVERY Jane Chu
2022-02-02 13:23 ` Christoph Hellwig
2022-02-02 21:27 ` Jane Chu
2022-02-03 13:43 ` Christoph Hellwig
2022-02-04 5:17 ` Dan Williams
2022-02-04 5:32 ` Dan Williams
2022-02-06 8:29 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 3/7] dm: make dm aware of target's DAXDEV_RECOVERY capability Jane Chu
2022-02-04 5:34 ` Dan Williams
2022-02-06 8:27 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 4/7] dax: add dax_recovery_write to dax_op and dm target type Jane Chu
2022-02-02 13:34 ` Christoph Hellwig
2022-02-02 22:03 ` Jane Chu
2022-02-04 6:03 ` Dan Williams
2022-02-06 8:25 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 5/7] pmem: add pmem_recovery_write() dax op Jane Chu
2022-02-02 13:43 ` Christoph Hellwig
2022-02-02 22:13 ` Jane Chu
2022-02-04 6:21 ` Dan Williams
2022-02-06 8:08 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 6/7] dax: add recovery_write to dax_iomap_iter in failure path Jane Chu
2022-02-02 13:44 ` Christoph Hellwig
2022-02-02 22:18 ` Jane Chu
2022-01-28 21:31 ` [PATCH v5 7/7] pmem: fix pmem_do_write() avoid writing to 'np' page Jane Chu
2022-02-02 13:28 ` Christoph Hellwig
2022-02-02 21:31 ` Jane Chu
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