From: Thomas Gleixner <tglx@linutronix.de>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirsky <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@intel.com>,
Borislav Petkov <bpetkov@suse.de>,
Greg KH <gregkh@linuxfoundation.org>,
keescook@google.com, hughd@google.com,
Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Rik van Riel <riel@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
David Laight <David.Laight@aculab.com>,
Eduardo Valentin <eduval@amazon.com>,
aliguori@amazon.com, Will Deacon <will.deacon@arm.com>,
Vlastimil Babka <vbabka@suse.cz>,
daniel.gruss@iaik.tugraz.at, Ingo Molnar <mingo@kernel.org>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [patch V181 35/54] x86/entry: Align entry text section to PMD boundary
Date: Fri, 18 May 2018 12:38:39 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1805181232280.2172@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20180517155806.77k4zw5n3q6ia4yq@treble>
On Thu, 17 May 2018, Josh Poimboeuf wrote:
> On Wed, Dec 20, 2017 at 10:35:38PM +0100, Thomas Gleixner wrote:
> > From: Thomas Gleixner <tglx@linutronix.de>
> >
> > The (irq)entry text must be visible in the user space page tables. To allow
> > simple PMD based sharing, make the entry text PMD aligned.
> >
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > Signed-off-by: Ingo Molnar <mingo@kernel.org>
>
> With my config, this patch adds 2.5M (+~25%) to the kernel text size.
> Is there a more granular way to achieve this?
We could make it PTE granular with some effort, but that would make the
whole PTI handling more complex. So not sure, if that's worth it.
Thanks,
tglx
next prev parent reply other threads:[~2018-05-18 10:38 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-20 21:35 [patch V181 00/54] x86/pti: Final XMAS release Thomas Gleixner
2017-12-20 21:35 ` [patch V181 01/54] x86/Kconfig: Limit NR_CPUS on 32bit to a sane amount Thomas Gleixner
2017-12-20 21:35 ` [patch V181 02/54] x86/mm/dump_pagetables: Check PAGE_PRESENT for real Thomas Gleixner
2017-12-20 21:35 ` [patch V181 03/54] x86/mm/dump_pagetables: Make the address hints correct and readable Thomas Gleixner
2017-12-20 21:35 ` [patch V181 04/54] x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy Thomas Gleixner
2017-12-20 21:35 ` [patch V181 05/54] x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode Thomas Gleixner
2017-12-20 21:35 ` [patch V181 06/54] arch: Allow arch_dup_mmap() to fail Thomas Gleixner
2017-12-20 21:35 ` [patch V181 07/54] x86/ldt: Rework locking Thomas Gleixner
2017-12-20 21:35 ` [patch V181 08/54] x86/ldt: Prevent ldt inheritance on exec Thomas Gleixner
2017-12-20 21:35 ` [patch V181 09/54] x86/mm/64: Improve the memory map documentation Thomas Gleixner
2017-12-20 21:35 ` [patch V181 10/54] x86/doc: Remove obvious weirdness Thomas Gleixner
2017-12-20 21:35 ` [patch V181 11/54] x86/entry: Remove SYSENTER_stack naming Thomas Gleixner
2017-12-20 21:35 ` [patch V181 12/54] x86/uv: Use the right tlbflush API Thomas Gleixner
2017-12-20 21:35 ` [patch V181 13/54] x86/microcode: Dont abuse the tlbflush interface Thomas Gleixner
2017-12-20 21:35 ` [patch V181 14/54] x86/mm: Use __flush_tlb_one() for kernel memory Thomas Gleixner
2017-12-20 21:35 ` [patch V181 15/54] x86/mm: Remove superfluous barriers Thomas Gleixner
2017-12-20 21:35 ` [patch V181 16/54] x86/mm: Clarify which functions are supposed to flush what Thomas Gleixner
2017-12-20 21:35 ` [patch V181 17/54] x86/mm: Move the CR3 construction functions to tlbflush.h Thomas Gleixner
2017-12-20 21:35 ` [patch V181 18/54] x86/mm: Remove hard-coded ASID limit checks Thomas Gleixner
2017-12-20 21:35 ` [patch V181 19/54] x86/mm: Put MMU to hardware ASID translation in one place Thomas Gleixner
2017-12-20 21:35 ` [patch V181 20/54] x86/mm: Create asm/invpcid.h Thomas Gleixner
2017-12-20 21:35 ` [patch V181 21/54] x86/cpu_entry_area: Move it to a separate unit Thomas Gleixner
2017-12-20 22:29 ` Thomas Gleixner
2017-12-20 21:35 ` [patch V181 22/54] x86/cpu_entry_area: Move it out of fixmap Thomas Gleixner
2017-12-22 2:46 ` [V181,22/54] " Andrei Vagin
2017-12-22 13:05 ` Thomas Gleixner
2017-12-20 21:35 ` [patch V181 23/54] init: Invoke init_espfix_bsp() from mm_init() Thomas Gleixner
2017-12-20 21:35 ` [patch V181 24/54] x86/cpufeatures: Add X86_BUG_CPU_INSECURE Thomas Gleixner
2017-12-20 21:35 ` [patch V181 25/54] x86/mm/pti: Disable global pages if PAGE_TABLE_ISOLATION=y Thomas Gleixner
2017-12-20 21:35 ` [patch V181 26/54] x86/mm/pti: Prepare the x86/entry assembly code for entry/exit CR3 switching Thomas Gleixner
2017-12-20 21:35 ` [patch V181 27/54] x86/mm/pti: Add infrastructure for page table isolation Thomas Gleixner
2017-12-20 21:35 ` [patch V181 28/54] x86/mm/pti: Add mapping helper functions Thomas Gleixner
2017-12-20 21:35 ` [patch V181 29/54] x86/mm/pti: Allow NX poison to be set in p4d/pgd Thomas Gleixner
2017-12-20 21:35 ` [patch V181 30/54] x86/mm/pti: Allocate a separate user PGD Thomas Gleixner
2017-12-20 21:35 ` [patch V181 31/54] x86/mm/pti: Populate " Thomas Gleixner
2017-12-20 21:35 ` [patch V181 32/54] x86/mm/pti: Add functions to clone kernel PMDs Thomas Gleixner
2017-12-20 21:35 ` [patch V181 33/54] x86/mm/pti: Force entry through trampoline when PTI active Thomas Gleixner
2017-12-20 21:35 ` [patch V181 34/54] x86/mm/pti: Share cpu_entry_area with user space page tables Thomas Gleixner
2017-12-20 21:35 ` [patch V181 35/54] x86/entry: Align entry text section to PMD boundary Thomas Gleixner
2018-05-17 15:58 ` Josh Poimboeuf
2018-05-18 10:38 ` Thomas Gleixner [this message]
2017-12-20 21:35 ` [patch V181 36/54] x86/mm/pti: Share entry text PMD Thomas Gleixner
2017-12-20 21:35 ` [patch V181 37/54] x86/mm/pti: Map ESPFIX into user space Thomas Gleixner
2017-12-20 21:35 ` [patch V181 38/54] x86/cpu_entry_area: Add debugstore entries to cpu_entry_area Thomas Gleixner
2017-12-20 21:35 ` [patch V181 39/54] x86/events/intel/ds: Map debug buffers in cpu_entry_area Thomas Gleixner
2017-12-20 21:35 ` [patch V181 40/54] x86/mm/64: Make a full PGD-entry size hole in the memory map Thomas Gleixner
2017-12-20 21:35 ` [patch V181 41/54] x86/pti: Put the LDT in its own PGD if PTI is on Thomas Gleixner
2017-12-20 21:35 ` [patch V181 42/54] x86/pti: Map the vsyscall page if needed Thomas Gleixner
2017-12-20 21:35 ` [patch V181 43/54] x86/mm: Allow flushing for future ASID switches Thomas Gleixner
2017-12-20 21:35 ` [patch V181 44/54] x86/mm: Abstract switching CR3 Thomas Gleixner
2017-12-20 21:35 ` [patch V181 45/54] x86/mm: Use/Fix PCID to optimize user/kernel switches Thomas Gleixner
2017-12-20 21:35 ` [patch V181 46/54] x86/mm: Optimize RESTORE_CR3 Thomas Gleixner
2017-12-20 21:35 ` [patch V181 47/54] x86/mm: Use INVPCID for __native_flush_tlb_single() Thomas Gleixner
2017-12-20 21:35 ` [patch V181 48/54] x86/mm: Clarify the whole ASID/kernel PCID/user PCID naming Thomas Gleixner
2017-12-20 21:35 ` [patch V181 49/54] x86/dumpstack: Indicate in Oops whether pti is configured and enabled Thomas Gleixner
2017-12-20 22:03 ` Jiri Kosina
2017-12-20 21:35 ` [patch V181 50/54] x86/mm/pti: Add Kconfig Thomas Gleixner
2017-12-20 21:35 ` [patch V181 51/54] x86/mm/dump_pagetables: Add page table directory Thomas Gleixner
2017-12-20 21:35 ` [patch V181 52/54] x86/mm/dump_pagetables: Check user space page table for WX pages Thomas Gleixner
2017-12-20 21:35 ` [patch V181 53/54] x86/mm/dump_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-12-20 21:35 ` [patch V181 54/54] x86/ldt: Make the LDT mapping RO Thomas Gleixner
2017-12-20 23:48 ` [patch V181 00/54] x86/pti: Final XMAS release Thomas Gleixner
2017-12-21 12:57 ` Kirill A. Shutemov
2017-12-21 16:26 ` Kirill A. Shutemov
2017-12-21 18:39 ` Thomas Gleixner
2017-12-21 15:57 ` Boris Ostrovsky
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