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From: Andy Lutomirski <luto@amacapital.net>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Tycho Andersen <tycho@tycho.ws>,
	Andy Lutomirski <luto@kernel.org>,
	Khalid Aziz <khalid.aziz@oracle.com>,
	Juerg Haefliger <juergh@gmail.com>,
	jsteckli@amazon.de, Andi Kleen <ak@linux.intel.com>,
	liran.alon@oracle.com, Kees Cook <keescook@google.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	deepa.srinivasan@oracle.com, chris hyser <chris.hyser@oracle.com>,
	Tyler Hicks <tyhicks@canonical.com>,
	"Woodhouse, David" <dwmw@amazon.co.uk>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Jon Masters <jcm@redhat.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	kanth.ghatraju@oracle.com,
	Joao Martins <joao.m.martins@oracle.com>,
	Jim Mattson <jmattson@google.com>,
	pradeep.vincent@oracle.com, John Haxby <john.haxby@oracle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Christoph Hellwig <hch@lst.de>,
	steven.sistare@oracle.com, Laura Abbott <labbott@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Aaron Lu <aaron.lu@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	alexander.h.duyck@linux.intel.com,
	Amir Goldstein <amir73il@gmail.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	aneesh.kumar@linux.ibm.com, anthony.yznaga@oracle.com,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>,
	arunks@codeaurora.org, Ben Hutchings <ben@decadent.org.uk>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	brgl@bgdev.pl, Catalin Marinas <catalin.marinas@arm.com>,
	Jonathan Corbet <corbet@lwn.net>,
	cpandya@codeaurora.org, Daniel Vetter <daniel.vetter@ffwll.ch>,
	Dan Williams <dan.j.williams@intel.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Roman Gushchin <guro@fb.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	James Morse <james.morse@arm.com>, Jann Horn <jannh@google.com>,
	Juergen Gross <jgross@suse.com>, Jiri Kosina <jkosina@suse.cz>,
	James Morris <jmorris@namei.org>, Joe Perches <joe@perches.com>,
	Souptick Joarder <jrdr.linux@gmail.com>,
	Joerg Roedel <jroedel@suse.de>,
	Keith Busch <keith.busch@intel.com>,
	Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
	Logan Gunthorpe <logang@deltatee.com>,
	marco.antonio.780@gmail.com, Mark Rutland <mark.rutland@arm.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Michal Hocko <mhocko@suse.com>, Michal Hocko <mhocko@suse.cz>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Ingo Molnar <mingo@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	osalvador@suse.de,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	pavel.tatashin@microsoft.com,
	Randy Dunlap <rdunlap@infradead.org>,
	richard.weiyang@gmail.com, "Serge E. Hallyn" <serge@hallyn.com>,
	iommu@lists.linux-foundation.org, X86 ML <x86@kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	LSM List <linux-security-module@vger.kernel.org>,
	Khalid Aziz <khalid@gonehiking.org>
Subject: Re: [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault
Date: Thu, 4 Apr 2019 11:11:26 -0600	[thread overview]
Message-ID: <8876301F-C720-4DFD-8D01-F9C526E21A10@amacapital.net> (raw)
In-Reply-To: <alpine.DEB.2.21.1904041822320.1802@nanos.tec.linutronix.de>


> On Apr 4, 2019, at 10:28 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> 
>> On Thu, 4 Apr 2019, Tycho Andersen wrote:
>>    leaq    -PTREGS_SIZE(%rax), %rsp
>>    UNWIND_HINT_FUNC sp_offset=PTREGS_SIZE
>> 
>> +    /*
>> +     * If we oopsed in an interrupt handler, interrupts may be off. Let's turn
>> +     * them back on before going back to "normal" code.
>> +     */
>> +    sti
> 
> That breaks the paravirt muck and tracing/lockdep.
> 
> ENABLE_INTERRUPTS() is what you want plus TRACE_IRQ_ON to keep the tracer
> and lockdep happy.
> 
> 

I’m sure we’ll find some other thing we forgot to reset eventually, so let’s do this in C.  Change the call do_exit to call __finish_rewind_stack_do_exit and add the latter as a C function that does local_irq_enable() and do_exit().

WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
	Khalid Aziz <khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
	steven.sistare-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
	Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
	Tycho Andersen <tycho-E0fblnxP3wo@public.gmane.org>,
	Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	aneesh.kumar-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org,
	James Morris <jmorris-gx6/JNMH7DfYtjvyW6yDsg@public.gmane.org>,
	anthony.yznaga-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
	Nicholas Piggin <npiggin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Greg KH
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	Randy Dunlap <rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Souptick Joarder
	<jrdr.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Jiri Kosina <jkosina-AlSwsSmVLrQ@public.gmane.org>,
	Joe Perches <joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>,
	arunks-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	"Woodhouse, David" <dwmw-vV1OtcyAfmbQXOPxS62xeg@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	"open list:DOCUMENTATION"
	<linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Keith Busch <keith.busch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Joao Martins
	<joao.m.martins-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
	"H. Peter Anvin" <hp>
Subject: Re: [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault
Date: Thu, 4 Apr 2019 11:11:26 -0600	[thread overview]
Message-ID: <8876301F-C720-4DFD-8D01-F9C526E21A10@amacapital.net> (raw)
In-Reply-To: <alpine.DEB.2.21.1904041822320.1802-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>


> On Apr 4, 2019, at 10:28 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> 
>> On Thu, 4 Apr 2019, Tycho Andersen wrote:
>>    leaq    -PTREGS_SIZE(%rax), %rsp
>>    UNWIND_HINT_FUNC sp_offset=PTREGS_SIZE
>> 
>> +    /*
>> +     * If we oopsed in an interrupt handler, interrupts may be off. Let's turn
>> +     * them back on before going back to "normal" code.
>> +     */
>> +    sti
> 
> That breaks the paravirt muck and tracing/lockdep.
> 
> ENABLE_INTERRUPTS() is what you want plus TRACE_IRQ_ON to keep the tracer
> and lockdep happy.
> 
> 

I’m sure we’ll find some other thing we forgot to reset eventually, so let’s do this in C.  Change the call do_exit to call __finish_rewind_stack_do_exit and add the latter as a C function that does local_irq_enable() and do_exit().
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  reply	other threads:[~2019-04-04 17:56 UTC|newest]

Thread overview: 202+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-03 17:34 [RFC PATCH v9 00/13] Add support for eXclusive Page Frame Ownership Khalid Aziz
2019-04-03 17:34 ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 01/13] mm: add MAP_HUGETLB support to vm_mmap Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04  0:12   ` Andy Lutomirski
2019-04-04  0:12     ` Andy Lutomirski
2019-04-04  1:42     ` Tycho Andersen
2019-04-04  1:42       ` Tycho Andersen
2019-04-04  4:12       ` Andy Lutomirski
2019-04-04  4:12         ` Andy Lutomirski
2019-04-04 15:47         ` Tycho Andersen
2019-04-04 15:47           ` Tycho Andersen
2019-04-04 16:23           ` Sebastian Andrzej Siewior
2019-04-04 16:28           ` Thomas Gleixner
2019-04-04 16:28             ` Thomas Gleixner
2019-04-04 17:11             ` Andy Lutomirski [this message]
2019-04-04 17:11               ` Andy Lutomirski
2019-04-03 17:34 ` [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04  7:21   ` Peter Zijlstra
2019-04-04  7:21     ` Peter Zijlstra
2019-04-04  9:25     ` Peter Zijlstra
2019-04-04  9:25       ` Peter Zijlstra
2019-04-04 14:48     ` Tycho Andersen
2019-04-04 14:48       ` Tycho Andersen
2019-04-04  7:43   ` Peter Zijlstra
2019-04-04  7:43     ` Peter Zijlstra
2019-04-04 15:15     ` Khalid Aziz
2019-04-04 15:15       ` Khalid Aziz
2019-04-04 17:01       ` Peter Zijlstra
2019-04-04 17:01         ` Peter Zijlstra
2019-04-17 16:15   ` Ingo Molnar
2019-04-17 16:15     ` Ingo Molnar
2019-04-17 16:15     ` Ingo Molnar
2019-04-17 16:15     ` Ingo Molnar
2019-04-17 16:49     ` Khalid Aziz
2019-04-17 16:49       ` Khalid Aziz
2019-04-17 16:49       ` Khalid Aziz
2019-04-17 16:49       ` Khalid Aziz
2019-04-17 17:09       ` Ingo Molnar
2019-04-17 17:09         ` Ingo Molnar
2019-04-17 17:09         ` Ingo Molnar
2019-04-17 17:09         ` Ingo Molnar
2019-04-17 17:19         ` Nadav Amit
2019-04-17 17:19           ` Nadav Amit
2019-04-17 17:19           ` Nadav Amit
2019-04-17 17:19           ` Nadav Amit
2019-04-17 17:26           ` Ingo Molnar
2019-04-17 17:26             ` Ingo Molnar
2019-04-17 17:26             ` Ingo Molnar
2019-04-17 17:26             ` Ingo Molnar
2019-04-17 17:44             ` Nadav Amit
2019-04-17 17:44               ` Nadav Amit
2019-04-17 17:44               ` Nadav Amit
2019-04-17 17:44               ` Nadav Amit
2019-04-17 21:19               ` Thomas Gleixner
2019-04-17 21:19                 ` Thomas Gleixner
2019-04-17 21:19                 ` Thomas Gleixner
2019-04-17 21:19                 ` Thomas Gleixner
2019-04-17 21:19                 ` Thomas Gleixner
2019-04-17 23:18                 ` Linus Torvalds
2019-04-17 23:18                   ` Linus Torvalds
2019-04-17 23:18                   ` Linus Torvalds
2019-04-17 23:42                   ` Thomas Gleixner
2019-04-17 23:42                     ` Thomas Gleixner
2019-04-17 23:42                     ` Thomas Gleixner
2019-04-17 23:42                     ` Thomas Gleixner
2019-04-17 23:42                     ` Thomas Gleixner
2019-04-17 23:52                     ` Linus Torvalds
2019-04-17 23:52                       ` Linus Torvalds
2019-04-17 23:52                       ` Linus Torvalds
2019-04-17 23:52                       ` Linus Torvalds
2019-04-17 23:52                       ` Linus Torvalds
2019-04-18  4:41                       ` Andy Lutomirski
2019-04-18  4:41                         ` Andy Lutomirski
2019-04-18  4:41                         ` Andy Lutomirski
2019-04-18  4:41                         ` Andy Lutomirski
2019-04-18  4:41                         ` Andy Lutomirski
2019-04-18  5:41                         ` Kees Cook
2019-04-18  5:41                           ` Kees Cook
2019-04-18  5:41                           ` Kees Cook via iommu
2019-04-18  5:41                           ` Kees Cook
2019-04-18  5:41                           ` Kees Cook
2019-04-18 14:34                           ` Khalid Aziz
2019-04-18 14:34                             ` Khalid Aziz
2019-04-18 14:34                             ` Khalid Aziz
2019-04-18 14:34                             ` Khalid Aziz
2019-04-22 19:30                             ` Khalid Aziz
2019-04-22 19:30                               ` Khalid Aziz
2019-04-22 19:30                               ` Khalid Aziz
2019-04-22 19:30                               ` Khalid Aziz
2019-04-22 22:23                             ` Kees Cook
2019-04-22 22:23                               ` Kees Cook
2019-04-22 22:23                               ` Kees Cook via iommu
2019-04-22 22:23                               ` Kees Cook via iommu
2019-04-22 22:23                               ` Kees Cook
2019-04-18  6:14                       ` Thomas Gleixner
2019-04-18  6:14                         ` Thomas Gleixner
2019-04-18  6:14                         ` Thomas Gleixner
2019-04-18  6:14                         ` Thomas Gleixner
2019-04-18  6:14                         ` Thomas Gleixner
2019-04-17 17:33         ` Khalid Aziz
2019-04-17 17:33           ` Khalid Aziz
2019-04-17 17:33           ` Khalid Aziz
2019-04-17 17:33           ` Khalid Aziz
2019-04-17 19:49           ` Andy Lutomirski
2019-04-17 19:49             ` Andy Lutomirski
2019-04-17 19:49             ` Andy Lutomirski
2019-04-17 19:49             ` Andy Lutomirski
2019-04-17 19:49             ` Andy Lutomirski
2019-04-17 19:52             ` Tycho Andersen
2019-04-17 19:52               ` Tycho Andersen
2019-04-17 19:52               ` Tycho Andersen
2019-04-17 19:52               ` Tycho Andersen
2019-04-17 20:12             ` Khalid Aziz
2019-04-17 20:12               ` Khalid Aziz
2019-04-17 20:12               ` Khalid Aziz
2019-04-17 20:12               ` Khalid Aziz
2019-05-01 14:49       ` Waiman Long
2019-05-01 14:49         ` Waiman Long
2019-05-01 14:49         ` Waiman Long
2019-05-01 14:49         ` Waiman Long
2019-05-01 15:18         ` Khalid Aziz
2019-05-01 15:18           ` Khalid Aziz
2019-05-01 15:18           ` Khalid Aziz
2019-05-01 15:18           ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 04/13] xpfo, x86: Add support for XPFO for x86-64 Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04  7:52   ` Peter Zijlstra
2019-04-04  7:52     ` Peter Zijlstra
2019-04-04 15:40     ` Khalid Aziz
2019-04-04 15:40       ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 05/13] mm: add a user_virt_to_phys symbol Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 06/13] lkdtm: Add test for XPFO Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 07/13] arm64/mm: Add support " Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 08/13] swiotlb: Map the buffer if it was unmapped by XPFO Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 09/13] xpfo: add primitives for mapping underlying memory Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 10/13] arm64/mm, xpfo: temporarily map dcache regions Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 11/13] xpfo, mm: optimize spinlock usage in xpfo_kunmap Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04  7:56   ` Peter Zijlstra
2019-04-04  7:56     ` Peter Zijlstra
2019-04-04 16:06     ` Khalid Aziz
2019-04-04 16:06       ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 12/13] xpfo, mm: Defer TLB flushes for non-current CPUs (x86 only) Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04  4:10   ` Andy Lutomirski
2019-04-04  4:10     ` Andy Lutomirski
     [not found]     ` <CALCETrXMXxnWqN94d83UvGWhkD1BNWiwvH2vsUth1w0T3=0ywQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-04 22:55       ` Khalid Aziz
2019-04-05  7:17         ` Thomas Gleixner
2019-04-05  7:17           ` Thomas Gleixner
2019-04-05 14:44           ` Dave Hansen
2019-04-05 14:44             ` Dave Hansen
2019-04-05 15:24             ` Andy Lutomirski
2019-04-05 15:24               ` Andy Lutomirski
2019-04-05 15:24               ` Andy Lutomirski
2019-04-05 15:56               ` Tycho Andersen
2019-04-05 15:56                 ` Tycho Andersen
2019-04-05 15:56                 ` Tycho Andersen
2019-04-05 16:32                 ` Andy Lutomirski
2019-04-05 16:32                   ` Andy Lutomirski
2019-04-05 16:32                   ` Andy Lutomirski
2019-04-05 15:56               ` Khalid Aziz
2019-04-05 15:56                 ` Khalid Aziz
2019-04-05 15:56                 ` Khalid Aziz
2019-04-05 16:01               ` Dave Hansen
2019-04-05 16:01                 ` Dave Hansen
2019-04-05 16:01                 ` Dave Hansen
2019-04-05 16:27                 ` Andy Lutomirski
2019-04-05 16:27                   ` Andy Lutomirski
2019-04-05 16:27                   ` Andy Lutomirski
2019-04-05 16:41                   ` Peter Zijlstra
2019-04-05 16:41                     ` Peter Zijlstra
2019-04-05 16:41                     ` Peter Zijlstra
2019-04-05 17:35                   ` Khalid Aziz
2019-04-05 17:35                     ` Khalid Aziz
2019-04-05 17:35                     ` Khalid Aziz
2019-04-05 15:44             ` Khalid Aziz
2019-04-05 15:44               ` Khalid Aziz
2019-04-05 15:44               ` Khalid Aziz
2019-04-05 15:24         ` Andy Lutomirski
2019-04-05 15:24           ` Andy Lutomirski
2019-04-05 15:24           ` Andy Lutomirski
2019-04-04  8:18   ` Peter Zijlstra
2019-04-04  8:18     ` Peter Zijlstra
2019-04-03 17:34 ` [RFC PATCH v9 13/13] xpfo, mm: Optimize XPFO TLB flushes by batching them together Khalid Aziz
2019-04-03 17:34   ` Khalid Aziz
2019-04-04 16:44 ` [RFC PATCH v9 00/13] Add support for eXclusive Page Frame Ownership Nadav Amit
2019-04-04 16:44   ` Nadav Amit
2019-04-04 17:18   ` Khalid Aziz
2019-04-04 17:18     ` Khalid Aziz
2019-04-06  6:40 ` Jon Masters
2019-04-06  6:40   ` Jon Masters
2019-04-06  6:40   ` Jon Masters

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