From: Aili Yao <yaoaili@kingsoft.com>
To: "HORIGUCHI NAOYA(堀口 直也)" <naoya.horiguchi@nec.com>
Cc: "Luck, Tony" <tony.luck@intel.com>,
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>,
"sunhao2@kingsoft.com" <sunhao2@kingsoft.com>,
<yaoaili@kingsoft.com>
Subject: Re: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned
Date: Tue, 16 Mar 2021 15:54:28 +0800 [thread overview]
Message-ID: <20210316155428.15c665c2@alex-virtual-machine> (raw)
In-Reply-To: <20210316064215.GA23401@hori.linux.bs1.fc.nec.co.jp>
> As you answered in another email, p->mce_vaddr is set only on KERNEL_COPYIN case,
> then if p->mce_vaddr is available also for generic SRAR MCE (I'm assuming that we are
> talking about issues on race between generic SRAR MCE not only for KERNEL_COPYIN case),
> that might be helpful, although it might be hard to implement.
> And I'm afraid that walking page table could find the wrong virtual address if a process
> have multiple entries to the single page. We could send multiple SIGBUSs for such case,
> but maybe that's not an optimal solution.
Yes, agree, I can't find one way to address this multiple entries case, to make sure we get
the exact correct virtual address.
But also I will post a v2 RFC patch for this issue for only discussion purpose!
Thanks!
> ----
> From 147449a97e2ea3420ac3523f13523f5d30a13614 Mon Sep 17 00:00:00 2001
> From: Naoya Horiguchi <naoya.horiguchi@nec.com>
> Date: Tue, 16 Mar 2021 14:22:21 +0900
> Subject: [PATCH] pagemap: expose hwpoison entry
>
> not-signed-off-by-yet: Naoya Horiguchi <naoya.horiguchi@nec.com>
> ---
> fs/proc/task_mmu.c | 6 ++++++
> include/linux/swapops.h | 12 ++++++++++++
> tools/vm/page-types.c | 5 ++++-
> 3 files changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 602e3a52884d..08cea209bae7 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -1300,6 +1300,7 @@ struct pagemapread {
> #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
> #define PM_SOFT_DIRTY BIT_ULL(55)
> #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
> +#define PM_HWPOISON BIT_ULL(60)
> #define PM_FILE BIT_ULL(61)
> #define PM_SWAP BIT_ULL(62)
> #define PM_PRESENT BIT_ULL(63)
> @@ -1385,6 +1386,11 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
> if (is_migration_entry(entry))
> page = migration_entry_to_page(entry);
>
> + if (is_hwpoison_entry(entry)) {
> + page = hwpoison_entry_to_page(entry);
> + flags |= PM_HWPOISON;
> + }
> +
> if (is_device_private_entry(entry))
> page = device_private_entry_to_page(entry);
> }
> diff --git a/include/linux/swapops.h b/include/linux/swapops.h
> index d9b7c9132c2f..1b9dedbd06ab 100644
> --- a/include/linux/swapops.h
> +++ b/include/linux/swapops.h
> @@ -323,6 +323,13 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
> return swp_type(entry) == SWP_HWPOISON;
> }
>
> +static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
> +{
> + struct page *p = pfn_to_page(swp_offset(entry));
> + WARN_ON(!PageHWPoison(p));
> + return p;
> +}
> +
> static inline void num_poisoned_pages_inc(void)
> {
> atomic_long_inc(&num_poisoned_pages);
> @@ -345,6 +352,11 @@ static inline int is_hwpoison_entry(swp_entry_t swp)
> return 0;
> }
>
> +static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
> +{
> + return NULL;
> +}
> +
> static inline void num_poisoned_pages_inc(void)
> {
> }
> diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
> index 0517c744b04e..1160d5a14955 100644
> --- a/tools/vm/page-types.c
> +++ b/tools/vm/page-types.c
> @@ -53,6 +53,7 @@
> #define PM_SWAP_OFFSET(x) (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT)
> #define PM_SOFT_DIRTY (1ULL << 55)
> #define PM_MMAP_EXCLUSIVE (1ULL << 56)
> +#define PM_HWPOISON (1ULL << 60)
> #define PM_FILE (1ULL << 61)
> #define PM_SWAP (1ULL << 62)
> #define PM_PRESENT (1ULL << 63)
> @@ -311,6 +312,8 @@ static unsigned long pagemap_pfn(uint64_t val)
>
> if (val & PM_PRESENT)
> pfn = PM_PFRAME(val);
> + else if (val & PM_HWPOISON)
> + pfn = PM_SWAP_OFFSET(val);
> else
> pfn = 0;
>
> @@ -742,7 +745,7 @@ static void walk_vma(unsigned long index, unsigned long count)
> pfn = pagemap_pfn(buf[i]);
> if (pfn)
> walk_pfn(index + i, pfn, 1, buf[i]);
> - if (buf[i] & PM_SWAP)
> + else if (buf[i] & PM_SWAP)
> walk_swap(index + i, buf[i]);
> }
>
--
Thanks!
Aili Yao
next prev parent reply other threads:[~2021-03-16 7:55 UTC|newest]
Thread overview: 61+ 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
2021-03-10 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
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 [this message]
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 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
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