From: "Huang\, Ying" <ying.huang@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>, Bob Liu <liubo95@huawei.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
Alex Williamson <alex.williamson@redhat.com>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>,
Rik van Riel <riel@redhat.com>, Michal Hocko <mhocko@suse.com>,
Dave Jiang <dave.jiang@intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org,
Vegard Nossum <vegard.nossum@oracle.com>,
Andy Lutomirski <luto@kernel.org>,
Matthew Wilcox <willy@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Kees Coo k <keescook@chromium.org>,
"xieyisheng (A)" <xieyisheng1@huawei.com>
Subject: Re: [PATCH 1/2] mm: Add kernel MMU notifier to manage IOTLB/DEVTLB
Date: Thu, 14 Dec 2017 14:43:27 +0800 [thread overview]
Message-ID: <87efnxn71s.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <4466eac3-c4f5-47e4-e568-912a560240c1@intel.com> (Dave Hansen's message of "Wed, 13 Dec 2017 22:28:37 -0800")
Hi, Dave,
Dave Hansen <dave.hansen@intel.com> writes:
> On 12/13/2017 07:38 PM, Lu Baolu wrote:
>> 2. When vmalloc/vfree interfaces are called, the page mappings
>> for kernel memory might get changed. And current code calls
>> flush_tlb_kernel_range() to flush CPU TLBs only. The IOTLB or
>> DevTLB will be stale compared to that on the cpu for kernel
>> mappings.
>
> What's the plan to deal with all of the ways other than vmalloc() that
> the kernel changes the page tables?
The kernel MMU notifier is called in flush_tlb_kernel_range(). So IOMMU
will be notified for TLB flushing caused by all ways that the kernel
changes the page tables including vmalloc, kmap, etc.
Best Regards,
Huang, Ying
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next prev parent reply other threads:[~2017-12-14 6:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 1:02 [PATCH 0/2] Kernel MMU notifier for IOTLB/DEVTLB management Lu Baolu
[not found] ` <1513213366-22594-1-git-send-email-baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-12-14 1:02 ` [PATCH 1/2] mm: Add kernel MMU notifier to manage IOTLB/DEVTLB Lu Baolu
[not found] ` <1513213366-22594-2-git-send-email-baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-12-14 3:10 ` Bob Liu
2017-12-14 3:38 ` Lu Baolu
[not found] ` <5A31F232.90901-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-12-14 6:07 ` Bob Liu
[not found] ` <e7462b54-9d3a-abfd-8df2-2db3780de78d-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-12-15 3:08 ` Raj, Ashok
2017-12-14 6:28 ` Dave Hansen
2017-12-14 6:43 ` Huang, Ying [this message]
2017-12-14 1:02 ` [PATCH 2/2] iommu/vt-d: Register " Lu Baolu
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