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From: Shakeel Butt <shakeelb@google.com>
To: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Linux MM <linux-mm@kvack.org>,
	x86@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
	linux-hardening@vger.kernel.org,
	kernel-hardening@lists.openwall.com,
	Ira Weiny <ira.weiny@intel.com>, Mike Rapoport <rppt@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC 5/9] x86, mm: Use cache of page tables
Date: Thu, 6 May 2021 11:24:18 -0700	[thread overview]
Message-ID: <CALvZod7ieLEObX0y-7X+_zMwaVN5o0P-ZwZVLqCAK5ytQrNs9w@mail.gmail.com> (raw)
In-Reply-To: <20210505003032.489164-6-rick.p.edgecombe@intel.com>

On Tue, May 4, 2021 at 5:36 PM Rick Edgecombe
<rick.p.edgecombe@intel.com> wrote:
>
[...]
> +#ifdef CONFIG_PKS_PG_TABLES
> +struct page *alloc_table(gfp_t gfp)
> +{
> +       struct page *table;
> +
> +       if (!pks_page_en)
> +               return alloc_page(gfp);
> +
> +       table = get_grouped_page(numa_node_id(), &gpc_pks);
> +       if (!table)
> +               return NULL;
> +
> +       if (gfp & __GFP_ZERO)
> +               memset(page_address(table), 0, PAGE_SIZE);
> +
> +       if (memcg_kmem_enabled() &&
> +           gfp & __GFP_ACCOUNT &&
> +           !__memcg_kmem_charge_page(table, gfp, 0)) {
> +               free_table(table);
> +               table = NULL;
> +       }
> +
> +       VM_BUG_ON_PAGE(*(unsigned long *)&table->ptl, table);

table can be NULL due to charge failure.

  parent reply	other threads:[~2021-05-06 18:24 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05  0:30 [PATCH RFC 0/9] PKS write protected " Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 1/9] list: Support getting most recent element in list_lru Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 2/9] list: Support list head not in object for list_lru Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 3/9] x86/mm/cpa: Add grouped page allocations Rick Edgecombe
2021-05-05 12:08   ` Mike Rapoport
2021-05-05 13:09     ` Peter Zijlstra
2021-05-05 18:45       ` Mike Rapoport
2021-05-05 21:57         ` Edgecombe, Rick P
2021-05-09  9:39           ` Mike Rapoport
2021-05-10 19:38             ` Edgecombe, Rick P
2021-05-05  0:30 ` [PATCH RFC 4/9] mm: Explicitly zero page table lock ptr Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 5/9] x86, mm: Use cache of page tables Rick Edgecombe
2021-05-05  8:51   ` Peter Zijlstra
2021-05-05 12:09     ` Mike Rapoport
2021-05-05 13:19       ` Peter Zijlstra
2021-05-05 21:54         ` Edgecombe, Rick P
2021-05-06 17:59       ` Matthew Wilcox
2021-05-06 18:24   ` Shakeel Butt [this message]
2021-05-07 16:27     ` Edgecombe, Rick P
2021-05-05  0:30 ` [PATCH RFC 6/9] x86/mm/cpa: Add set_memory_pks() Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 7/9] x86/mm/cpa: Add perm callbacks to grouped pages Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 8/9] x86, mm: Protect page tables with PKS Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 9/9] x86, cpa: PKS protect direct map page tables Rick Edgecombe
2021-05-05  2:03 ` [PATCH RFC 0/9] PKS write protected " Ira Weiny
2021-05-05  6:25 ` Kees Cook
2021-05-05  8:37   ` Peter Zijlstra
2021-05-05 18:38     ` Kees Cook
2021-05-05 19:51   ` Edgecombe, Rick P
2021-05-06  0:00   ` Ira Weiny
2021-05-05 11:08 ` Vlastimil Babka
2021-05-05 11:56   ` Peter Zijlstra
2021-05-05 19:46     ` Edgecombe, Rick P

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