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From: Tong Tiangen <tongtiangen@huawei.com>
To: Mark Rutland <mark.rutland@arm.com>,
	James Morse <james.morse@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Robin Murphy <robin.murphy@arm.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>, <x86@kernel.org>,
	"H . Peter Anvin" <hpa@zytor.com>
Cc: <linuxppc-dev@lists.ozlabs.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Xie XiuQi <xiexiuqi@huawei.com>, Guohanjun <guohanjun@huawei.com>,
	Tong Tiangen <tongtiangen@huawei.com>
Subject: [PATCH -next v7 3/4] arm64: add uaccess to machine check safe
Date: Fri, 12 Aug 2022 07:05:56 +0000	[thread overview]
Message-ID: <20220812070557.1028499-4-tongtiangen@huawei.com> (raw)
In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com>

If user access fail due to hardware memory error, only the relevant
processes are affected, so killing the user process and isolate the
error page with hardware memory errors is a more reasonable choice
than kernel panic.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
---
 arch/arm64/mm/extable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 478e639f8680..28ec35e3d210 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -85,10 +85,10 @@ bool fixup_exception_mc(struct pt_regs *regs)
 	if (!ex)
 		return false;
 
-	/*
-	 * This is not complete, More Machine check safe extable type can
-	 * be processed here.
-	 */
+	switch (ex->type) {
+	case EX_TYPE_UACCESS_ERR_ZERO:
+		return ex_handler_uaccess_err_zero(ex, regs);
+	}
 
 	return false;
 }
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Tong Tiangen <tongtiangen@huawei.com>
To: Mark Rutland <mark.rutland@arm.com>,
	James Morse <james.morse@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Robin Murphy <robin.murphy@arm.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>, <x86@kernel.org>,
	"H . Peter Anvin" <hpa@zytor.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>,
	Xie XiuQi <xiexiuqi@huawei.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Tong Tiangen <tongtiangen@huawei.com>,
	Guohanjun <guohanjun@huawei.com>,
	linuxppc-dev@lists.ozlabs.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH -next v7 3/4] arm64: add uaccess to machine check safe
Date: Fri, 12 Aug 2022 07:05:56 +0000	[thread overview]
Message-ID: <20220812070557.1028499-4-tongtiangen@huawei.com> (raw)
In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com>

If user access fail due to hardware memory error, only the relevant
processes are affected, so killing the user process and isolate the
error page with hardware memory errors is a more reasonable choice
than kernel panic.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
---
 arch/arm64/mm/extable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 478e639f8680..28ec35e3d210 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -85,10 +85,10 @@ bool fixup_exception_mc(struct pt_regs *regs)
 	if (!ex)
 		return false;
 
-	/*
-	 * This is not complete, More Machine check safe extable type can
-	 * be processed here.
-	 */
+	switch (ex->type) {
+	case EX_TYPE_UACCESS_ERR_ZERO:
+		return ex_handler_uaccess_err_zero(ex, regs);
+	}
 
 	return false;
 }
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Tong Tiangen <tongtiangen@huawei.com>
To: Mark Rutland <mark.rutland@arm.com>,
	James Morse <james.morse@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Robin Murphy <robin.murphy@arm.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>, <x86@kernel.org>,
	"H . Peter Anvin" <hpa@zytor.com>
Cc: <linuxppc-dev@lists.ozlabs.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Xie XiuQi <xiexiuqi@huawei.com>, Guohanjun <guohanjun@huawei.com>,
	Tong Tiangen <tongtiangen@huawei.com>
Subject: [PATCH -next v7 3/4] arm64: add uaccess to machine check safe
Date: Fri, 12 Aug 2022 07:05:56 +0000	[thread overview]
Message-ID: <20220812070557.1028499-4-tongtiangen@huawei.com> (raw)
In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com>

If user access fail due to hardware memory error, only the relevant
processes are affected, so killing the user process and isolate the
error page with hardware memory errors is a more reasonable choice
than kernel panic.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
---
 arch/arm64/mm/extable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 478e639f8680..28ec35e3d210 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -85,10 +85,10 @@ bool fixup_exception_mc(struct pt_regs *regs)
 	if (!ex)
 		return false;
 
-	/*
-	 * This is not complete, More Machine check safe extable type can
-	 * be processed here.
-	 */
+	switch (ex->type) {
+	case EX_TYPE_UACCESS_ERR_ZERO:
+		return ex_handler_uaccess_err_zero(ex, regs);
+	}
 
 	return false;
 }
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-08-12  7:06 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-12  7:05 [PATCH -next v7 0/4]arm64: add machine check safe support Tong Tiangen
2022-08-12  7:05 ` Tong Tiangen
2022-08-12  7:05 ` Tong Tiangen
2022-08-12  7:05 ` [PATCH -next v7 1/4] uaccess: add generic fallback version of copy_mc_to_user() Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05 ` [PATCH -next v7 2/4] arm64: add support for machine check error safe Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05 ` Tong Tiangen [this message]
2022-08-12  7:05   ` [PATCH -next v7 3/4] arm64: add uaccess to machine check safe Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05 ` [PATCH -next v7 4/4] arm64: add cow " Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-12  7:05   ` Tong Tiangen
2022-08-24  6:44 ` [PATCH -next v7 0/4]arm64: add machine check safe support Tong Tiangen
2022-08-24  6:44   ` Tong Tiangen
2022-08-24  6:44   ` Tong Tiangen

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