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32 results

memory_hotplug.c

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    • David Hildenbrand's avatar
      00d6c019
      mm/memory_hotplug: don't access uninitialized memmaps in shrink_pgdat_span() · 00d6c019
      David Hildenbrand authored
      We might use the nid of memmaps that were never initialized.  For
      example, if the memmap was poisoned, we will crash the kernel in
      pfn_to_nid() right now.  Let's use the calculated boundaries of the
      separate zones instead.  This now also avoids having to iterate over a
      whole bunch of subsections again, after shrinking one zone.
      
      Before commit d0dc12e8 ("mm/memory_hotplug: optimize memory
      hotplug"), the memmap was initialized to 0 and the node was set to the
      right value.  After that commit, the node might be garbage.
      
      We'll have to fix shrink_zone_span() next.
      
      Link: http://lkml.kernel.org/r/20191006085646.5768-4-david@redhat.com
      
      
      Fixes: f1dd2cd1 ("mm, memory_hotplug: do not associate hotadded memory to zones until online")	[d0dc12e8]
      Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
      Reported-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
      Cc: Oscar Salvador <osalvador@suse.de>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Wei Yang <richardw.yang@linux.intel.com>
      Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Anshuman Khandual <anshuman.khandual@arm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Christophe Leroy <christophe.leroy@c-s.fr>
      Cc: Damian Tometzki <damian.tometzki@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Halil Pasic <pasic@linux.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Ira Weiny <ira.weiny@intel.com>
      Cc: Jason Gunthorpe <jgg@ziepe.ca>
      Cc: Jun Yao <yaojun8558363@gmail.com>
      Cc: Logan Gunthorpe <logang@deltatee.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
      Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Mike Rapoport <rppt@linux.ibm.com>
      Cc: Pankaj Gupta <pagupta@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Pavel Tatashin <pavel.tatashin@microsoft.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Qian Cai <cai@lca.pw>
      Cc: Rich Felker <dalias@libc.org>
      Cc: Robin Murphy <robin.murphy@arm.com>
      Cc: Steve Capper <steve.capper@arm.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tom Lendacky <thomas.lendacky@amd.com>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Vasily Gorbik <gor@linux.ibm.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Wei Yang <richard.weiyang@gmail.com>
      Cc: Will Deacon <will@kernel.org>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Yu Zhao <yuzhao@google.com>
      Cc: <stable@vger.kernel.org>	[4.13+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      00d6c019
      History
      mm/memory_hotplug: don't access uninitialized memmaps in shrink_pgdat_span()
      David Hildenbrand authored
      We might use the nid of memmaps that were never initialized.  For
      example, if the memmap was poisoned, we will crash the kernel in
      pfn_to_nid() right now.  Let's use the calculated boundaries of the
      separate zones instead.  This now also avoids having to iterate over a
      whole bunch of subsections again, after shrinking one zone.
      
      Before commit d0dc12e8 ("mm/memory_hotplug: optimize memory
      hotplug"), the memmap was initialized to 0 and the node was set to the
      right value.  After that commit, the node might be garbage.
      
      We'll have to fix shrink_zone_span() next.
      
      Link: http://lkml.kernel.org/r/20191006085646.5768-4-david@redhat.com
      
      
      Fixes: f1dd2cd1 ("mm, memory_hotplug: do not associate hotadded memory to zones until online")	[d0dc12e8]
      Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
      Reported-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
      Cc: Oscar Salvador <osalvador@suse.de>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Wei Yang <richardw.yang@linux.intel.com>
      Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Anshuman Khandual <anshuman.khandual@arm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Christophe Leroy <christophe.leroy@c-s.fr>
      Cc: Damian Tometzki <damian.tometzki@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Halil Pasic <pasic@linux.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Ira Weiny <ira.weiny@intel.com>
      Cc: Jason Gunthorpe <jgg@ziepe.ca>
      Cc: Jun Yao <yaojun8558363@gmail.com>
      Cc: Logan Gunthorpe <logang@deltatee.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
      Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Mike Rapoport <rppt@linux.ibm.com>
      Cc: Pankaj Gupta <pagupta@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Pavel Tatashin <pavel.tatashin@microsoft.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Qian Cai <cai@lca.pw>
      Cc: Rich Felker <dalias@libc.org>
      Cc: Robin Murphy <robin.murphy@arm.com>
      Cc: Steve Capper <steve.capper@arm.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tom Lendacky <thomas.lendacky@amd.com>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Vasily Gorbik <gor@linux.ibm.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Wei Yang <richard.weiyang@gmail.com>
      Cc: Will Deacon <will@kernel.org>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Yu Zhao <yuzhao@google.com>
      Cc: <stable@vger.kernel.org>	[4.13+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    kvm.h 5.71 KiB
    /*
     * Copyright (C) 2012 - Virtual Open Systems and Columbia University
     * Author: Christoffer Dall <c.dall@virtualopensystems.com>
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License, version 2, as
     * published by the Free Software Foundation.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
     */
    
    #ifndef __ARM_KVM_H__
    #define __ARM_KVM_H__
    
    #include <linux/types.h>
    #include <asm/ptrace.h>
    
    #define __KVM_HAVE_GUEST_DEBUG
    #define __KVM_HAVE_IRQ_LINE
    
    #define KVM_REG_SIZE(id)						\
    	(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
    
    /* Valid for svc_regs, abt_regs, und_regs, irq_regs in struct kvm_regs */
    #define KVM_ARM_SVC_sp		svc_regs[0]
    #define KVM_ARM_SVC_lr		svc_regs[1]
    #define KVM_ARM_SVC_spsr	svc_regs[2]
    #define KVM_ARM_ABT_sp		abt_regs[0]
    #define KVM_ARM_ABT_lr		abt_regs[1]
    #define KVM_ARM_ABT_spsr	abt_regs[2]
    #define KVM_ARM_UND_sp		und_regs[0]
    #define KVM_ARM_UND_lr		und_regs[1]
    #define KVM_ARM_UND_spsr	und_regs[2]
    #define KVM_ARM_IRQ_sp		irq_regs[0]
    #define KVM_ARM_IRQ_lr		irq_regs[1]
    #define KVM_ARM_IRQ_spsr	irq_regs[2]
    
    /* Valid only for fiq_regs in struct kvm_regs */
    #define KVM_ARM_FIQ_r8		fiq_regs[0]
    #define KVM_ARM_FIQ_r9		fiq_regs[1]
    #define KVM_ARM_FIQ_r10		fiq_regs[2]
    #define KVM_ARM_FIQ_fp		fiq_regs[3]
    #define KVM_ARM_FIQ_ip		fiq_regs[4]
    #define KVM_ARM_FIQ_sp		fiq_regs[5]
    #define KVM_ARM_FIQ_lr		fiq_regs[6]
    #define KVM_ARM_FIQ_spsr	fiq_regs[7]
    
    struct kvm_regs {
    	struct pt_regs usr_regs;	/* R0_usr - R14_usr, PC, CPSR */
    	unsigned long svc_regs[3];	/* SP_svc, LR_svc, SPSR_svc */
    	unsigned long abt_regs[3];	/* SP_abt, LR_abt, SPSR_abt */
    	unsigned long und_regs[3];	/* SP_und, LR_und, SPSR_und */
    	unsigned long irq_regs[3];	/* SP_irq, LR_irq, SPSR_irq */
    	unsigned long fiq_regs[8];	/* R8_fiq - R14_fiq, SPSR_fiq */
    };
    
    /* Supported Processor Types */
    #define KVM_ARM_TARGET_CORTEX_A15	0
    #define KVM_ARM_TARGET_CORTEX_A7	1
    #define KVM_ARM_NUM_TARGETS		2
    
    /* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */
    #define KVM_ARM_DEVICE_TYPE_SHIFT	0