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
next prev parent reply other threads:[~2021-01-15 17:05 UTC|newest]
Thread overview: 9+ 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 ` [PATCH RFC 1/4] arm64: io: Introduce IO_SPACE_BASE 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 [this message]
2021-01-15 16:58 ` [PATCH RFC 4/4] logic_pio: Warn on and discard accesses to addresses below IO_SPACE_BASE John Garry
2021-01-18 1:59 ` [PATCH RFC 0/4] Fix arm64 crash for accessing unmapped IO port regions (reboot) Jiaxun Yang
2021-01-18 9:42 ` John Garry
2021-01-26 15:16 ` Arnd Bergmann
2021-01-26 17:56 ` John Garry
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