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From: John Garry <john.garry@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>, <arnd@arndb.de>,
	<akpm@linux-foundation.org>, <xuwei5@hisilicon.com>,
	<lorenzo.pieralisi@arm.com>, <helgaas@kernel.org>,
	<jiaxun.yang@flygoat.com>, <song.bao.hua@hisilicon.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <linux-arch@vger.kernel.org>,
	<linux-mips@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<linuxarm@openeuler.org>, John Garry <john.garry@huawei.com>
Subject: [PATCH RFC 3/4] kernel/resource: Make ioport_resource.start configurable
Date: Sat, 16 Jan 2021 00:58:48 +0800	[thread overview]
Message-ID: <1610729929-188490-4-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1610729929-188490-1-git-send-email-john.garry@huawei.com>

Make IO space base address to be configurable through IO_SPACE_BASE.

This will allow architectures which do not natively support IO ports -
like arm64 - to harden against legacy ISA-based drivers which use
hardcoded addresses to access IO ports.

Any attempts for these drivers to request a resource region will now fail
for architectures with set IO_SPACE_BASE above legacy ISA IO port region
(0xffff).

Signed-off-by: John Garry <john.garry@huawei.com>
---
 kernel/resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 3ae2f56cc79d..d191c4d796c7 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -29,7 +29,7 @@
 
 struct resource ioport_resource = {
 	.name	= "PCI IO",
-	.start	= 0,
+	.start	= IO_SPACE_BASE,
 	.end	= IO_SPACE_LIMIT,
 	.flags	= IORESOURCE_IO,
 };
-- 
2.26.2


WARNING: multiple messages have this Message-ID (diff)
From: John Garry <john.garry@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>, <arnd@arndb.de>,
	<akpm@linux-foundation.org>, <xuwei5@hisilicon.com>,
	<lorenzo.pieralisi@arm.com>, <helgaas@kernel.org>,
	<jiaxun.yang@flygoat.com>,  <song.bao.hua@hisilicon.com>
Cc: linux-arch@vger.kernel.org, linux-pci@vger.kernel.org,
	John Garry <john.garry@huawei.com>,
	linuxarm@openeuler.org, linux-kernel@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC 3/4] kernel/resource: Make ioport_resource.start configurable
Date: Sat, 16 Jan 2021 00:58:48 +0800	[thread overview]
Message-ID: <1610729929-188490-4-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1610729929-188490-1-git-send-email-john.garry@huawei.com>

Make IO space base address to be configurable through IO_SPACE_BASE.

This will allow architectures which do not natively support IO ports -
like arm64 - to harden against legacy ISA-based drivers which use
hardcoded addresses to access IO ports.

Any attempts for these drivers to request a resource region will now fail
for architectures with set IO_SPACE_BASE above legacy ISA IO port region
(0xffff).

Signed-off-by: John Garry <john.garry@huawei.com>
---
 kernel/resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 3ae2f56cc79d..d191c4d796c7 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -29,7 +29,7 @@
 
 struct resource ioport_resource = {
 	.name	= "PCI IO",
-	.start	= 0,
+	.start	= IO_SPACE_BASE,
 	.end	= IO_SPACE_LIMIT,
 	.flags	= IORESOURCE_IO,
 };
-- 
2.26.2


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

  parent reply	other threads:[~2021-01-15 17:05 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15 16:58 [PATCH RFC 0/4] Fix arm64 crash for accessing unmapped IO port regions (reboot) John Garry
2021-01-15 16:58 ` John Garry
2021-01-15 16:58 ` [PATCH RFC 1/4] arm64: io: Introduce IO_SPACE_BASE John Garry
2021-01-15 16:58   ` John Garry
2021-01-15 16:58 ` [PATCH RFC 2/4] asm-generic/io.h: Add IO_SPACE_BASE John Garry
2021-01-15 16:58   ` John Garry
2021-01-15 16:58 ` John Garry [this message]
2021-01-15 16:58   ` [PATCH RFC 3/4] kernel/resource: Make ioport_resource.start configurable John Garry
2021-01-16  0:37   ` kernel test robot
2021-01-15 16:58 ` [PATCH RFC 4/4] logic_pio: Warn on and discard accesses to addresses below IO_SPACE_BASE John Garry
2021-01-15 16:58   ` John Garry
2021-01-15 19:16   ` kernel test robot
2021-01-15 19:43   ` kernel test robot
2021-01-18  1:59 ` [PATCH RFC 0/4] Fix arm64 crash for accessing unmapped IO port regions (reboot) Jiaxun Yang
2021-01-18  1:59   ` Jiaxun Yang
2021-01-18  9:42   ` John Garry
2021-01-18  9:42     ` John Garry
2021-01-26 15:16 ` Arnd Bergmann
2021-01-26 15:16   ` Arnd Bergmann
2021-01-26 17:56   ` John Garry
2021-01-26 17:56     ` John Garry

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