From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH AUTOSEL 4.9 09/42] powerpc/pseries: Don't fail hash page table insert for bolted mapping
Date: Wed, 11 Dec 2019 10:34:37 -0500 [thread overview]
Message-ID: <20191211153510.23861-9-sashal@kernel.org> (raw)
In-Reply-To: <20191211153510.23861-1-sashal@kernel.org>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
[ Upstream commit 75838a3290cd4ebbd1f567f310ba04b6ef017ce4 ]
If the hypervisor returned H_PTEG_FULL for H_ENTER hcall, retry a hash page table
insert by removing a random entry from the group.
After some runtime, it is very well possible to find all the 8 hash page table
entry slot in the hpte group used for mapping. Don't fail a bolted entry insert
in that case. With Storage class memory a user can find this error easily since
a namespace enable/disable is equivalent to memory add/remove.
This results in failures as reported below:
$ ndctl create-namespace -r region1 -t pmem -m devdax -a 65536 -s 100M
libndctl: ndctl_dax_enable: dax1.3: failed to enable
Error: namespace1.2: failed to enable
failed to create namespace: No such device or address
In kernel log we find the details as below:
Unable to create mapping for hot added memory 0xc000042006000000..0xc00004200d000000: -1
dax_pmem: probe of dax1.3 failed with error -14
This indicates that we failed to create a bolted hash table entry for direct-map
address backing the namespace.
We also observe failures such that not all namespaces will be enabled with
ndctl enable-namespace all command.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191024093542.29777-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/mm/hash_utils_64.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index bd666287c5eda..de1d8cdd29915 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -289,7 +289,14 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
ret = mmu_hash_ops.hpte_insert(hpteg, vpn, paddr, tprot,
HPTE_V_BOLTED, psize, psize,
ssize);
-
+ if (ret == -1) {
+ /* Try to remove a non bolted entry */
+ ret = mmu_hash_ops.hpte_remove(hpteg);
+ if (ret != -1)
+ ret = mmu_hash_ops.hpte_insert(hpteg, vpn, paddr, tprot,
+ HPTE_V_BOLTED, psize, psize,
+ ssize);
+ }
if (ret < 0)
break;
--
2.20.1
next prev parent reply other threads:[~2019-12-11 17:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191211153510.23861-1-sashal@kernel.org>
2019-12-11 15:34 ` [PATCH AUTOSEL 4.9 08/42] powerpc/pseries: Mark accumulate_stolen_time() as notrace Sasha Levin
2019-12-11 15:34 ` Sasha Levin [this message]
2019-12-11 15:34 ` [PATCH AUTOSEL 4.9 12/42] powerpc/security/book3s64: Report L1TF status in sysfs Sasha Levin
2019-12-11 15:34 ` [PATCH AUTOSEL 4.9 13/42] powerpc/book3s64/hash: Add cond_resched to avoid soft lockup warning Sasha Levin
2019-12-11 15:34 ` [PATCH AUTOSEL 4.9 24/42] powerpc/pseries/cmm: Implement release() function for sysfs device Sasha Levin
2019-12-11 15:34 ` [PATCH AUTOSEL 4.9 25/42] powerpc/security: Fix wrong message when RFI Flush is disable Sasha Levin
2019-12-11 15:35 ` [PATCH AUTOSEL 4.9 39/42] libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h Sasha Levin
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