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From: "Luck, Tony" <tony.luck@intel.com>
To: "HORIGUCHI NAOYA(堀口　直也)" <naoya.horiguchi@nec.com>,
	"Aili Yao" <yaoaili@kingsoft.com>
Cc: Oscar Salvador <osalvador@suse.de>,
	"david@redhat.com" <david@redhat.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"bp@alien8.de" <bp@alien8.de>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"yangfeng1@kingsoft.com" <yangfeng1@kingsoft.com>
Subject: RE: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned
Date: Thu, 11 Mar 2021 17:05:53 +0000	[thread overview]
Message-ID: <db80e98d2b264e988596d0d7d7c8a776@intel.com> (raw)
In-Reply-To: <20210311085529.GA22268@hori.linux.bs1.fc.nec.co.jp>

> I guess that p->mce_vaddr stores the virtual address of the error here.
> If so, sending SIGBUS with the address looks enough as we do now, so why
> do you walk page table to find the error virtual address?

p->mce_vaddr only has the virtual address for the COPYIN case. In that code
path we decode the kernel instruction that hit the fault in order to find the virtual
address. That's easy because:

1) The kernel RIP is known to be good (can't page fault etc. on kernel address).
2) There are only a half dozen instructions used by the kernel for get_user() or
     copy_from_user().

When the machine check happens during user execution accessing poison data
we only have the physical address (from MCi_ADDR).

-Tony

  parent reply	other threads:[~2021-03-11 17:06 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-24  7:16 [PATCH] mm,hwpoison: return -EBUSY when page already poisoned Aili Yao
2021-02-24 10:10 ` David Hildenbrand
2021-02-24 10:31 ` Oscar Salvador
2021-02-25  3:43   ` Aili Yao
2021-02-25 11:28     ` HORIGUCHI NAOYA(堀口　直也)
2021-02-25 11:39       ` Oscar Salvador
2021-02-25 12:38         ` HORIGUCHI NAOYA(堀口　直也)
2021-02-25 18:15           ` Luck, Tony
2021-02-26  2:19             ` HORIGUCHI NAOYA(堀口　直也)
2021-02-26  2:59               ` Aili Yao
2021-03-03  3:39                 ` Luck, Tony
2021-03-03  3:57                   ` Aili Yao
2021-03-03  8:39                     ` Aili Yao
2021-03-03 15:41                       ` Luck, Tony
2021-03-04  2:16                         ` Aili Yao
2021-03-04  4:19                           ` Aili Yao
2021-03-04  6:45                             ` Aili Yao
2021-03-04 23:57                               ` Luck, Tony
2021-03-05  1:30                                 ` Aili Yao
2021-03-05  1:36                                   ` Aili Yao
2021-03-05 22:11                                     ` Luck, Tony
2021-03-08  6:45                                       ` HORIGUCHI NAOYA(堀口　直也)
2021-03-08 18:54                                         ` Luck, Tony
2021-03-08 22:38                                           ` HORIGUCHI NAOYA(堀口　直也)
2021-03-08 22:55                                             ` [PATCH] mm/memory-failure: Use a mutex to avoid memory_failure() races Luck, Tony
2021-03-08 23:42                                               ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09  2:04                                               ` Aili Yao
2021-03-09  6:04                                                 ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09  6:35                                                   ` [PATCH v2] mm,hwpoison: return -EBUSY when page already poisoned Aili Yao
2021-03-09  8:28                                                     ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09 20:01                                                       ` Luck, Tony
2021-03-10  8:05                                                         ` HORIGUCHI NAOYA(堀口　直也)
2021-03-13  1:55                                                         ` Jue Wang
2021-03-13  1:55                                                           ` Jue Wang
2021-03-10  8:01                                                       ` Aili Yao
2021-03-31 11:25                                                     ` [PATCH v3] mm,hwpoison: return -EHWPOISON " Aili Yao
2021-04-01 15:33                                                       ` Luck, Tony
2021-04-02  1:18                                                         ` Aili Yao
2021-04-02 15:11                                                           ` Luck, Tony
2021-04-05 13:50                                                             ` HORIGUCHI NAOYA(堀口　直也)
2021-04-06  1:04                                                               ` Aili Yao
2021-03-09  6:38                                                   ` [PATCH] mm/memory-failure: Use a mutex to avoid memory_failure() races Aili Yao
2021-03-05 15:55                                   ` [PATCH] mm,hwpoison: return -EBUSY when page already poisoned Luck, Tony
2021-03-10  6:10                                     ` Aili Yao
2021-03-11  8:55                                       ` HORIGUCHI NAOYA(堀口　直也)
2021-03-11 11:23                                         ` Aili Yao
2021-03-11 17:05                                         ` Luck, Tony [this message]
2021-03-12  5:55                                           ` Aili Yao
2021-03-12 16:29                                             ` Luck, Tony
2021-03-12 23:48                                               ` Luck, Tony
2021-03-16  6:42                                                 ` HORIGUCHI NAOYA(堀口　直也)
2021-03-16  7:54                                                   ` Aili Yao
2021-03-17  0:29                                                 ` Luck, Tony
2021-03-17  9:07                                                   ` Aili Yao
2021-03-17  7:48                                         ` Aili Yao
2021-03-17  8:23                                           ` Aili Yao
2021-02-26  3:26               ` Tony Luck
2021-02-26  3:26                 ` Tony Luck
2021-02-26  2:52         ` Aili Yao
2021-02-26 17:58           ` Luck, Tony
2021-03-02  4:32             ` Aili Yao
2021-03-31 10:56         ` Aili Yao
2021-03-31 10:58           ` David Hildenbrand
2021-03-01 23:21 Jue Wang

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