The patch titled
paravirt: helper to disable all IO space
has been added to the -mm tree. Its filename is
paravirt-helper-to-disable-all-io-space.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: paravirt: helper to disable all IO space
From: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
In a virtual environment, device drivers such as legacy IDE will waste quite a
lot of time probing for their devices which will never appear. This helper
function allows a paravirt implementation to lay claim to the whole iomem and
ioport space, thereby disabling all device drivers trying to claim IO
resources.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/paravirt.c | 33 +++++++++++++++++++++++++++++++++
arch/i386/xen/setup.c | 2 ++
include/asm-i386/paravirt.h | 1 +
3 files changed, 36 insertions(+)
diff -puN arch/i386/kernel/paravirt.c~paravirt-helper-to-disable-all-io-space arch/i386/kernel/paravirt.c
--- a/arch/i386/kernel/paravirt.c~paravirt-helper-to-disable-all-io-space
+++ a/arch/i386/kernel/paravirt.c
@@ -228,6 +228,39 @@ static int __init print_banner(void)
}
core_initcall(print_banner);
+static struct resource reserve_ioports = {
+ .start = 0,
+ .end = IO_SPACE_LIMIT,
+ .name = "paravirt-ioport",
+ .flags = IORESOURCE_IO | IORESOURCE_BUSY,
+};
+
+static struct resource reserve_iomem = {
+ .start = 0,
+ .end = -1,
+ .name = "paravirt-iomem",
+ .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
+};
+
+/*
+ * Reserve the whole legacy IO space to prevent any legacy drivers
+ * from wasting time probing for their hardware. This is a fairly
+ * brute-force approach to disabling all non-virtual drivers.
+ *
+ * Note that this must be called very early to have any effect.
+ */
+int paravirt_disable_iospace(void)
+{
+ int ret = 0;
+
+ ret = request_resource(&ioport_resource, &reserve_ioports);
+ if (ret == 0)
+ ret = request_resource(&iomem_resource, &reserve_iomem);
+
+ return ret;
+}
+
+
struct paravirt_ops paravirt_ops = {
.name = "bare hardware",
.paravirt_enabled = 0,
diff -puN arch/i386/xen/setup.c~paravirt-helper-to-disable-all-io-space arch/i386/xen/setup.c
--- a/arch/i386/xen/setup.c~paravirt-helper-to-disable-all-io-space
+++ a/arch/i386/xen/setup.c
@@ -8,12 +8,14 @@
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pm.h>
+#include <linux/ioport.h>
#include <asm/elf.h>
#include <asm/e820.h>
#include <asm/setup.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
+#include <asm/io.h>
#include <xen/interface/physdev.h>
#include <xen/features.h>
diff -puN include/asm-i386/paravirt.h~paravirt-helper-to-disable-all-io-space include/asm-i386/paravirt.h
--- a/include/asm-i386/paravirt.h~paravirt-helper-to-disable-all-io-space
+++ a/include/asm-i386/paravirt.h
@@ -262,6 +262,7 @@ unsigned paravirt_patch_default(u8 type,
unsigned paravirt_patch_insns(void *site, unsigned len,
const char *start, const char *end);
+int paravirt_disable_iospace(void);
/*
* This generates an indirect call based on the operation type number.
_
Patches currently in -mm which might be from jeremy@xxxxxxxxxxxxx are
git-kbuild.patch
add-kstrndup-fix.patch
fix-x86_64-mm-xen-core-xen-implementation.patch
x86-use-elfnoteh-to-generate-vsyscall-notes-fix.patch
paravirt-helper-to-disable-all-io-space.patch
paravirt-helper-to-disable-all-io-space-fix.patch
xen-disable-all-non-virtual-devices.patch
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