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From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "rppt@kernel.org" <rppt@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"keescook@chromium.org" <keescook@chromium.org>,
	"Weiny, Ira" <ira.weiny@intel.com>,
	"linux-hardening@vger.kernel.org"
	<linux-hardening@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"vbabka@suse.cz" <vbabka@suse.cz>,
	"x86@kernel.org" <x86@kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"Williams, Dan J" <dan.j.williams@intel.com>,
	"Lutomirski, Andy" <luto@kernel.org>,
	"kernel-hardening@lists.openwall.com" 
	<kernel-hardening@lists.openwall.com>,
	"Hansen, Dave" <dave.hansen@intel.com>,
	"shakeelb@google.com" <shakeelb@google.com>
Subject: Re: [RFC PATCH v2 11/19] mm/sparsemem: Use alloc_table() for table allocations
Date: Tue, 31 Aug 2021 18:25:23 +0000	[thread overview]
Message-ID: <f77f3312a1b17b8f8de2ccf0f40f9f19f4a9f151.camel@intel.com> (raw)
In-Reply-To: <YS3uhdT88XFvP9n3@kernel.org>

On Tue, 2021-08-31 at 11:55 +0300, Mike Rapoport wrote:
> On Mon, Aug 30, 2021 at 04:59:19PM -0700, Rick Edgecombe wrote:
<trim> 
> > -static void * __meminit vmemmap_alloc_block_zero(unsigned long
> > size, int node)
> > +static void * __meminit vmemmap_alloc_table(int node)
> >  {
> > -	void *p = vmemmap_alloc_block(size, node);
> > +	void *p;
> > +	if (slab_is_available()) {
> > +		struct page *page = alloc_table_node(GFP_KERNEL |
> > __GFP_ZERO, node);
> 
> This change removes __GFP_RETRY_MAYFAIL|__GFP_NOWARN from the
> original gfp
> vmemmap_alloc_block() used.
Oh, yea good point. Hmm, I guess grouped pages could be aware of that
flag too. Would be a small addition, but it starts to grow
unfortunately.

> Not sure __GFP_RETRY_MAYFAIL is really needed in
> vmemmap_alloc_block_zero()
> at the first place, though.
Looks like due to a real issue:
055e4fd96e95b0eee0d92fd54a26be7f0d3bcad0

I think it should not affect PKS tables for now, so maybe I can make
separate logic instead. I'll look into it. Thanks.
> 
> More broadly, maybe it makes sense to split boot time and memory
> hotplug
> paths and use pxd_alloc() for the latter.
> 
> > +
> > +		if (!page)
> > +			return NULL;
> > +		return page_address(page);
> > +	}
> >  
> > +	p = __earlyonly_bootmem_alloc(node, PAGE_SIZE, PAGE_SIZE,
> > __pa(MAX_DMA_ADDRESS));
> 
> Opportunistically rename to __earlyonly_memblock_alloc()? ;-)
> 
Heh, I can. Just grepping, there are several other instances of
foo_bootmem() only calling foo_memblock() pattern scattered about. Or
maybe I'm missing the distinction.

<trim>

  reply	other threads:[~2021-08-31 18:25 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-30 23:59 [RFC PATCH v2 00/19] PKS write protected page tables Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 01/19] list: Support getting most recent element in list_lru Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 02/19] list: Support list head not in object for list_lru Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 03/19] x86/mm/cpa: Add grouped page allocations Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 04/19] mm: Explicitly zero page table lock ptr Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 05/19] x86, mm: Use cache of page tables Rick Edgecombe
2021-08-31  8:40   ` Mike Rapoport
2021-08-31 19:09     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 06/19] x86/mm/cpa: Add perm callbacks to grouped pages Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 07/19] x86/cpufeatures: Add feature for pks tables Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 08/19] x86/mm/cpa: Add get_grouped_page_atomic() Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 09/19] x86/mm: Support GFP_ATOMIC in alloc_table_node() Rick Edgecombe
2021-08-31  8:32   ` Mike Rapoport
2021-08-30 23:59 ` [RFC PATCH v2 10/19] x86/mm: Use alloc_table() for fill_pte(), etc Rick Edgecombe
2021-08-31  8:47   ` Mike Rapoport
2021-08-31 18:48     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 11/19] mm/sparsemem: Use alloc_table() for table allocations Rick Edgecombe
2021-08-31  8:55   ` Mike Rapoport
2021-08-31 18:25     ` Edgecombe, Rick P [this message]
2021-09-01  7:22       ` Mike Rapoport
2021-09-02 13:56         ` Vlastimil Babka
2021-08-30 23:59 ` [RFC PATCH v2 12/19] x86/mm: Use free_table in unmap path Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 13/19] mm/debug_vm_page_table: Use setters instead of WRITE_ONCE Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 14/19] x86/efi: Toggle table protections when copying Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 15/19] x86/mm/cpa: Add set_memory_pks() Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 16/19] x86/mm: Protect page tables with PKS Rick Edgecombe
2021-08-31  8:56   ` Mike Rapoport
2021-08-31 17:55     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 17/19] x86/mm/cpa: PKS protect direct map page tables Rick Edgecombe
2021-08-31 10:14   ` Mike Rapoport
2021-08-31 17:58     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 18/19] x86/mm: Add PKS table soft mode Rick Edgecombe
2021-08-31  3:49   ` Randy Dunlap
2021-08-31 17:55     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 19/19] x86/mm: Add PKS table debug checking Rick Edgecombe

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