From: David Hildenbrand <david@redhat.com>
To: Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Badger <ebadger@gigaio.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Michal Hocko <mhocko@suse.com>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params
Date: Mon, 24 Feb 2020 09:26:10 +0000 [thread overview]
Message-ID: <09de85e5-4e66-2d36-2d1c-65f7d341b7f0@redhat.com> (raw)
In-Reply-To: <20200221182503.28317-7-logang@deltatee.com>
On 21.02.20 19:25, Logan Gunthorpe wrote:
> devm_memremap_pages() is currently used by the PCI P2PDMA code to create
> struct page mappings for IO memory. At present, these mappings are created
> with PAGE_KERNEL which implies setting the PAT bits to be WB. However, on
> x86, an mtrr register will typically override this and force the cache
> type to be UC-. In the case firmware doesn't set this register it is
> effectively WB and will typically result in a machine check exception
> when it's accessed.
>
> Other arches are not currently likely to function correctly seeing they
> don't have any MTRR registers to fall back on.
>
> To solve this, provide a way to specify the pgprot value explicitly to
> arch_add_memory().
>
> Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a simple
> change to pass the pgprot_t down to their respective functions which set
> up the page tables. For x86_32, set the page tables explicitly using
> _set_memory_prot() (seeing they are already mapped). For ia64, s390 and
> sh, reject anything but PAGE_KERNEL settings -- this should be fine,
> for now, seeing these architectures don't support ZONE_DEVICE.
>
> A check in __add_pages() is also added to ensure the pgprot parameter was
> set for all arches.
>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> Acked-by: Michal Hocko <mhocko@suse.com>
[...]
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index c5df1b3dada0..30d6c1b8847e 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -56,9 +56,11 @@ enum {
> /*
> * Extended parameters for memory hotplug:
> * altmap: alternative allocator for memmap array (optional)
> + * pgprot: page protection flags to apply to newly added page tables (required)
s/added/created/?
--
Thanks,
David / dhildenb
WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Eric Badger <ebadger@gigaio.com>, Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v3 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params
Date: Mon, 24 Feb 2020 10:26:10 +0100 [thread overview]
Message-ID: <09de85e5-4e66-2d36-2d1c-65f7d341b7f0@redhat.com> (raw)
In-Reply-To: <20200221182503.28317-7-logang@deltatee.com>
On 21.02.20 19:25, Logan Gunthorpe wrote:
> devm_memremap_pages() is currently used by the PCI P2PDMA code to create
> struct page mappings for IO memory. At present, these mappings are created
> with PAGE_KERNEL which implies setting the PAT bits to be WB. However, on
> x86, an mtrr register will typically override this and force the cache
> type to be UC-. In the case firmware doesn't set this register it is
> effectively WB and will typically result in a machine check exception
> when it's accessed.
>
> Other arches are not currently likely to function correctly seeing they
> don't have any MTRR registers to fall back on.
>
> To solve this, provide a way to specify the pgprot value explicitly to
> arch_add_memory().
>
> Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a simple
> change to pass the pgprot_t down to their respective functions which set
> up the page tables. For x86_32, set the page tables explicitly using
> _set_memory_prot() (seeing they are already mapped). For ia64, s390 and
> sh, reject anything but PAGE_KERNEL settings -- this should be fine,
> for now, seeing these architectures don't support ZONE_DEVICE.
>
> A check in __add_pages() is also added to ensure the pgprot parameter was
> set for all arches.
>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> Acked-by: Michal Hocko <mhocko@suse.com>
[...]
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index c5df1b3dada0..30d6c1b8847e 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -56,9 +56,11 @@ enum {
> /*
> * Extended parameters for memory hotplug:
> * altmap: alternative allocator for memmap array (optional)
> + * pgprot: page protection flags to apply to newly added page tables (required)
s/added/created/?
--
Thanks,
David / dhildenb
WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Badger <ebadger@gigaio.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Michal Hocko <mhocko@suse.com>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params
Date: Mon, 24 Feb 2020 10:26:10 +0100 [thread overview]
Message-ID: <09de85e5-4e66-2d36-2d1c-65f7d341b7f0@redhat.com> (raw)
In-Reply-To: <20200221182503.28317-7-logang@deltatee.com>
On 21.02.20 19:25, Logan Gunthorpe wrote:
> devm_memremap_pages() is currently used by the PCI P2PDMA code to create
> struct page mappings for IO memory. At present, these mappings are created
> with PAGE_KERNEL which implies setting the PAT bits to be WB. However, on
> x86, an mtrr register will typically override this and force the cache
> type to be UC-. In the case firmware doesn't set this register it is
> effectively WB and will typically result in a machine check exception
> when it's accessed.
>
> Other arches are not currently likely to function correctly seeing they
> don't have any MTRR registers to fall back on.
>
> To solve this, provide a way to specify the pgprot value explicitly to
> arch_add_memory().
>
> Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a simple
> change to pass the pgprot_t down to their respective functions which set
> up the page tables. For x86_32, set the page tables explicitly using
> _set_memory_prot() (seeing they are already mapped). For ia64, s390 and
> sh, reject anything but PAGE_KERNEL settings -- this should be fine,
> for now, seeing these architectures don't support ZONE_DEVICE.
>
> A check in __add_pages() is also added to ensure the pgprot parameter was
> set for all arches.
>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> Acked-by: Michal Hocko <mhocko@suse.com>
[...]
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index c5df1b3dada0..30d6c1b8847e 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -56,9 +56,11 @@ enum {
> /*
> * Extended parameters for memory hotplug:
> * altmap: alternative allocator for memmap array (optional)
> + * pgprot: page protection flags to apply to newly added page tables (required)
s/added/created/?
--
Thanks,
David / dhildenb
WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Badger <ebadger@gigaio.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Michal Hocko <mhocko@suse.com>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params
Date: Mon, 24 Feb 2020 10:26:10 +0100 [thread overview]
Message-ID: <09de85e5-4e66-2d36-2d1c-65f7d341b7f0@redhat.com> (raw)
In-Reply-To: <20200221182503.28317-7-logang@deltatee.com>
On 21.02.20 19:25, Logan Gunthorpe wrote:
> devm_memremap_pages() is currently used by the PCI P2PDMA code to create
> struct page mappings for IO memory. At present, these mappings are created
> with PAGE_KERNEL which implies setting the PAT bits to be WB. However, on
> x86, an mtrr register will typically override this and force the cache
> type to be UC-. In the case firmware doesn't set this register it is
> effectively WB and will typically result in a machine check exception
> when it's accessed.
>
> Other arches are not currently likely to function correctly seeing they
> don't have any MTRR registers to fall back on.
>
> To solve this, provide a way to specify the pgprot value explicitly to
> arch_add_memory().
>
> Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a simple
> change to pass the pgprot_t down to their respective functions which set
> up the page tables. For x86_32, set the page tables explicitly using
> _set_memory_prot() (seeing they are already mapped). For ia64, s390 and
> sh, reject anything but PAGE_KERNEL settings -- this should be fine,
> for now, seeing these architectures don't support ZONE_DEVICE.
>
> A check in __add_pages() is also added to ensure the pgprot parameter was
> set for all arches.
>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> Acked-by: Michal Hocko <mhocko@suse.com>
[...]
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index c5df1b3dada0..30d6c1b8847e 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -56,9 +56,11 @@ enum {
> /*
> * Extended parameters for memory hotplug:
> * altmap: alternative allocator for memmap array (optional)
> + * pgprot: page protection flags to apply to newly added page tables (required)
s/added/created/?
--
Thanks,
David / dhildenb
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-02-24 9:26 UTC|newest]
Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-21 18:24 [PATCH v3 0/7] Allow setting caching mode in arch_add_memory() for P2PDMA Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` [PATCH v3 1/7] mm/memory_hotplug: Drop the flags field from struct mhp_restrictions Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-28 21:31 ` Dan Williams
2020-02-28 21:31 ` Dan Williams
2020-02-28 21:31 ` Dan Williams
2020-02-28 21:31 ` Dan Williams
2020-02-28 21:31 ` Dan Williams
2020-02-28 21:31 ` Dan Williams
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-02-21 18:24 ` [PATCH v3 2/7] mm/memory_hotplug: Rename mhp_restrictions to mhp_params Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-24 9:11 ` David Hildenbrand
2020-02-24 9:11 ` David Hildenbrand
2020-02-24 9:11 ` David Hildenbrand
2020-02-24 9:11 ` David Hildenbrand
2020-02-29 20:44 ` Dan Williams
2020-02-29 20:44 ` Dan Williams
2020-02-29 20:44 ` Dan Williams
2020-02-29 20:44 ` Dan Williams
2020-02-29 20:44 ` Dan Williams
2020-02-29 20:44 ` Dan Williams
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-03-03 9:50 ` Michal Hocko
2020-02-21 18:24 ` [PATCH v3 3/7] x86/mm: Thread pgprot_t through init_memory_mapping() Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-21 18:24 ` Logan Gunthorpe
2020-02-29 22:37 ` Dan Williams
2020-02-29 22:37 ` Dan Williams
2020-02-29 22:37 ` Dan Williams
2020-02-29 22:37 ` Dan Williams
2020-02-29 22:37 ` Dan Williams
2020-02-29 22:37 ` Dan Williams
2020-03-03 9:52 ` Michal Hocko
2020-03-03 9:52 ` Michal Hocko
2020-03-03 9:52 ` Michal Hocko
2020-03-03 9:52 ` Michal Hocko
2020-03-03 9:52 ` Michal Hocko
2020-02-21 18:25 ` [PATCH v3 4/7] x86/mm: Introduce _set_memory_prot() Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-29 22:33 ` Dan Williams
2020-02-29 22:33 ` Dan Williams
2020-02-29 22:33 ` Dan Williams
2020-02-29 22:33 ` Dan Williams
2020-02-29 22:33 ` Dan Williams
2020-02-29 22:33 ` Dan Williams
2020-03-02 18:46 ` Logan Gunthorpe
2020-03-02 18:46 ` Logan Gunthorpe
2020-03-02 18:46 ` Logan Gunthorpe
2020-03-02 18:46 ` Logan Gunthorpe
2020-03-02 18:46 ` Logan Gunthorpe
2020-02-21 18:25 ` [PATCH v3 5/7] powerpc/mm: Thread pgprot_t through create_section_mapping() Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` [PATCH v3 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-24 9:26 ` David Hildenbrand [this message]
2020-02-24 9:26 ` David Hildenbrand
2020-02-24 9:26 ` David Hildenbrand
2020-02-24 9:26 ` David Hildenbrand
2020-02-29 22:44 ` Dan Williams
2020-02-29 22:44 ` Dan Williams
2020-02-29 22:44 ` Dan Williams
2020-02-29 22:44 ` Dan Williams
2020-02-29 22:44 ` Dan Williams
2020-02-29 22:44 ` Dan Williams
2020-03-02 18:55 ` Logan Gunthorpe
2020-03-02 18:55 ` Logan Gunthorpe
2020-03-02 18:55 ` Logan Gunthorpe
2020-03-02 18:55 ` Logan Gunthorpe
2020-03-02 18:55 ` Logan Gunthorpe
2020-03-02 20:26 ` Dan Williams
2020-03-02 20:26 ` Dan Williams
2020-03-02 20:26 ` Dan Williams
2020-03-02 20:26 ` Dan Williams
2020-03-02 20:26 ` Dan Williams
2020-03-02 20:26 ` Dan Williams
2020-02-21 18:25 ` [PATCH v3 7/7] mm/memremap: Set caching mode for PCI P2PDMA memory to WC Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-21 18:25 ` Logan Gunthorpe
2020-02-29 22:47 ` Dan Williams
2020-02-29 22:47 ` Dan Williams
2020-02-29 22:47 ` Dan Williams
2020-02-29 22:47 ` Dan Williams
2020-02-29 22:47 ` Dan Williams
2020-02-29 22:47 ` Dan Williams
2020-03-02 21:20 ` Logan Gunthorpe
2020-03-02 21:20 ` Logan Gunthorpe
2020-03-02 21:20 ` Logan Gunthorpe
2020-03-02 21:20 ` Logan Gunthorpe
2020-03-02 21:20 ` Logan Gunthorpe
2020-02-27 17:17 ` [PATCH v3 0/7] Allow setting caching mode in arch_add_memory() for P2PDMA Jason Gunthorpe
2020-02-27 17:17 ` Jason Gunthorpe
2020-02-27 17:17 ` Jason Gunthorpe
2020-02-27 17:17 ` Jason Gunthorpe
2020-02-27 17:17 ` Jason Gunthorpe
2020-02-27 17:21 ` Logan Gunthorpe
2020-02-27 17:21 ` Logan Gunthorpe
2020-02-27 17:21 ` Logan Gunthorpe
2020-02-27 17:21 ` Logan Gunthorpe
2020-02-27 17:21 ` Logan Gunthorpe
2020-02-27 17:43 ` Jason Gunthorpe
2020-02-27 17:43 ` Jason Gunthorpe
2020-02-27 17:43 ` Jason Gunthorpe
2020-02-27 17:43 ` Jason Gunthorpe
2020-02-27 17:43 ` Jason Gunthorpe
2020-02-27 17:54 ` Logan Gunthorpe
2020-02-27 17:54 ` Logan Gunthorpe
2020-02-27 17:54 ` Logan Gunthorpe
2020-02-27 17:54 ` Logan Gunthorpe
2020-02-27 17:54 ` Logan Gunthorpe
2020-02-27 17:55 ` Dan Williams
2020-02-27 17:55 ` Dan Williams
2020-02-27 17:55 ` Dan Williams
2020-02-27 17:55 ` Dan Williams
2020-02-27 17:55 ` Dan Williams
2020-02-27 17:55 ` Dan Williams
2020-02-27 18:03 ` Jason Gunthorpe
2020-02-27 18:03 ` Jason Gunthorpe
2020-02-27 18:03 ` Jason Gunthorpe
2020-02-27 18:03 ` Jason Gunthorpe
2020-02-27 18:03 ` Jason Gunthorpe
2020-02-27 18:08 ` Dan Williams
2020-02-27 18:08 ` Dan Williams
2020-02-27 18:08 ` Dan Williams
2020-02-27 18:08 ` Dan Williams
2020-02-27 18:08 ` Dan Williams
2020-02-27 18:08 ` Dan Williams
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