From: David Hildenbrand <david@redhat.com>
To: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: x86@kernel.org, Jan Kara <jack@suse.cz>,
Catalin Marinas <catalin.marinas@arm.com>,
Yang Shi <shy828301@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Xu <peterx@redhat.com>, Michal Hocko <mhocko@kernel.org>,
linux-mm@kvack.org, Donald Dutile <ddutile@redhat.com>,
Liang Zhang <zhangliang5@huawei.com>,
Borislav Petkov <bp@alien8.de>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>,
Paul Mackerras <paulus@samba.org>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-s390@vger.kernel.org, Vasily Gorbik <gor@linux.ibm.com>,
Rik van Riel <riel@surriel.com>, Hugh Dickins <hughd@google.com>,
Matthew Wilcox <willy@infradead.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
linux-arm-kernel@lists.infradead.org,
Jason Gunthorpe <jgg@nvidia.com>,
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Jann Horn <jannh@google.com>, John Hubbard <jhubbard@nvidia.com>,
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Shakeel Butt <shakeelb@google.com>,
Oleg Nesterov <oleg@redhat.com>,
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Vlastimil Babka <vbabka@suse.cz>,
Oded Gabbay <oded.gabbay@gmail.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Nadav Amit <namit@vmware.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Roman Gushchin <guro@fb.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH v1 5/7] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 15 Mar 2022 17:58:42 +0100 [thread overview]
Message-ID: <8b13b6c0-78d4-48e3-06f0-ec0680d013a9@redhat.com> (raw)
In-Reply-To: <c8229082-e8f1-e605-25c2-0ec9d23efd9e@redhat.com>
>> This would mean that it is not OK to have bit 52 not zero for swap PTEs.
>> But if I read the POP correctly, all bits except for the DAT-protection
>> would be ignored for invalid PTEs, so maybe this comment needs some update
>> (for both bits 52 and also 55).
>>
>> Heiko might also have some more insight.
>
> Indeed, I wonder why we should get a specification exception when the
> PTE is invalid. I'll dig a bit into the PoP.
SA22-7832-12 6-46 ("Translation-Specification Exception") is clearer
"The page-table entry used for the translation is
valid, and bit position 52 does not contain zero."
"The page-table entry used for the translation is
valid, EDAT-1 does not apply, the instruction-exe-
cution-protection facility is not installed, and bit
position 55 does not contain zero. It is model
dependent whether this condition is recognized."
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2022-03-15 17:00 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 14:18 [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 1/7] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 2/7] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 3/7] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 4/7] arm64/pgtable: " David Hildenbrand
2022-03-16 18:27 ` Catalin Marinas
2022-03-17 10:04 ` David Hildenbrand
2022-03-17 17:58 ` Catalin Marinas
2022-03-18 9:59 ` David Hildenbrand
2022-03-18 11:33 ` Catalin Marinas
2022-03-18 14:14 ` David Hildenbrand
2022-03-21 14:38 ` Will Deacon
2022-03-21 14:39 ` Will Deacon
2022-03-21 15:07 ` David Hildenbrand
2022-03-21 17:44 ` Will Deacon
2022-03-21 18:27 ` Catalin Marinas
2022-03-22 9:46 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 5/7] s390/pgtable: " David Hildenbrand
2022-03-15 16:21 ` Gerald Schaefer
2022-03-15 16:37 ` David Hildenbrand
2022-03-15 16:58 ` David Hildenbrand [this message]
2022-03-15 17:12 ` David Hildenbrand
2022-03-15 17:14 ` David Hildenbrand
2022-03-16 10:56 ` Gerald Schaefer
2022-03-16 11:06 ` David Hildenbrand
2022-03-16 13:01 ` Christian Borntraeger
2022-03-16 13:27 ` Gerald Schaefer
2022-03-16 14:00 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 6/7] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 7/7] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-18 23:48 ` [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages Jason Gunthorpe
2022-03-19 11:17 ` David Hildenbrand
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