* [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
@ 2018-12-12 10:56 Miles Chen
2018-12-13 18:13 ` Will Deacon
0 siblings, 1 reply; 4+ messages in thread
From: Miles Chen @ 2018-12-12 10:56 UTC (permalink / raw)
To: Catalin Marinas, Will Deacon, Matthias Brugger
Cc: Miles Chen, linux-mediatek, linux-kernel, linux-arm-kernel,
wsd_upstream
When debug with kaslr, it is sometimes necessary to have PHYS_OFFSET to
perform linear virtual address to physical address translation.
Sometimes we're debugging with only few information such as a kernel log
and a symbol file, print PHYS_OFFSET in dump_kernel_offset() for that case.
Tested by:
echo c > /proc/sysrq-trigger
[ 11.996161] SMP: stopping secondary CPUs
[ 11.996732] Kernel Offset: 0x2522200000 from 0xffffff8008000000
[ 11.996881] PHYS_OFFSET: 0xffffffeb40000000
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Tested-by: Miles Chen <miles.chen@mediatek.com>
---
arch/arm64/kernel/setup.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index f4fc1e0544b7..4b0e1231625c 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -388,6 +388,7 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
offset, KIMAGE_VADDR);
+ pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
} else {
pr_emerg("Kernel Offset: disabled\n");
}
--
2.18.0
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^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
2018-12-12 10:56 [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset() Miles Chen
@ 2018-12-13 18:13 ` Will Deacon
2018-12-13 18:15 ` Ard Biesheuvel
0 siblings, 1 reply; 4+ messages in thread
From: Will Deacon @ 2018-12-13 18:13 UTC (permalink / raw)
To: Miles Chen
Cc: wsd_upstream, ard.biesheuvel, Catalin Marinas, linux-kernel,
linux-mediatek, Matthias Brugger, linux-arm-kernel
[+Ard because I'll basically go with his preference on this one]
On Wed, Dec 12, 2018 at 06:56:49PM +0800, Miles Chen wrote:
> When debug with kaslr, it is sometimes necessary to have PHYS_OFFSET to
> perform linear virtual address to physical address translation.
> Sometimes we're debugging with only few information such as a kernel log
> and a symbol file, print PHYS_OFFSET in dump_kernel_offset() for that case.
>
> Tested by:
> echo c > /proc/sysrq-trigger
> [ 11.996161] SMP: stopping secondary CPUs
> [ 11.996732] Kernel Offset: 0x2522200000 from 0xffffff8008000000
> [ 11.996881] PHYS_OFFSET: 0xffffffeb40000000
>
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> Tested-by: Miles Chen <miles.chen@mediatek.com>
> ---
> arch/arm64/kernel/setup.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index f4fc1e0544b7..4b0e1231625c 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -388,6 +388,7 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
> if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
> pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
> offset, KIMAGE_VADDR);
> + pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
> } else {
> pr_emerg("Kernel Offset: disabled\n");
> }
> --
> 2.18.0
>
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
2018-12-13 18:13 ` Will Deacon
@ 2018-12-13 18:15 ` Ard Biesheuvel
2018-12-14 0:52 ` Miles Chen
0 siblings, 1 reply; 4+ messages in thread
From: Ard Biesheuvel @ 2018-12-13 18:15 UTC (permalink / raw)
To: Will Deacon
Cc: wsd_upstream, Catalin Marinas, Linux Kernel Mailing List,
Miles Chen, moderated list:ARM/Mediatek SoC support,
Matthias Brugger, linux-arm-kernel
On Thu, 13 Dec 2018 at 19:12, Will Deacon <will.deacon@arm.com> wrote:
>
> [+Ard because I'll basically go with his preference on this one]
>
> On Wed, Dec 12, 2018 at 06:56:49PM +0800, Miles Chen wrote:
> > When debug with kaslr, it is sometimes necessary to have PHYS_OFFSET to
> > perform linear virtual address to physical address translation.
> > Sometimes we're debugging with only few information such as a kernel log
> > and a symbol file, print PHYS_OFFSET in dump_kernel_offset() for that case.
> >
> > Tested by:
> > echo c > /proc/sysrq-trigger
> > [ 11.996161] SMP: stopping secondary CPUs
> > [ 11.996732] Kernel Offset: 0x2522200000 from 0xffffff8008000000
> > [ 11.996881] PHYS_OFFSET: 0xffffffeb40000000
> >
> > Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> > Tested-by: Miles Chen <miles.chen@mediatek.com>
Fine with me, but I would like to see an ack from Miles Chen :-)
> > ---
> > arch/arm64/kernel/setup.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> > index f4fc1e0544b7..4b0e1231625c 100644
> > --- a/arch/arm64/kernel/setup.c
> > +++ b/arch/arm64/kernel/setup.c
> > @@ -388,6 +388,7 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
> > if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
> > pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
> > offset, KIMAGE_VADDR);
> > + pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
> > } else {
> > pr_emerg("Kernel Offset: disabled\n");
> > }
> > --
> > 2.18.0
> >
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
2018-12-13 18:15 ` Ard Biesheuvel
@ 2018-12-14 0:52 ` Miles Chen
0 siblings, 0 replies; 4+ messages in thread
From: Miles Chen @ 2018-12-14 0:52 UTC (permalink / raw)
To: Ard Biesheuvel
Cc: wsd_upstream, Catalin Marinas, Will Deacon,
Linux Kernel Mailing List,
moderated list:ARM/Mediatek SoC support, Matthias Brugger,
linux-arm-kernel
On Thu, 2018-12-13 at 19:15 +0100, Ard Biesheuvel wrote:
> On Thu, 13 Dec 2018 at 19:12, Will Deacon <will.deacon@arm.com> wrote:
> >
> > [+Ard because I'll basically go with his preference on this one]
> >
> > On Wed, Dec 12, 2018 at 06:56:49PM +0800, Miles Chen wrote:
> > > When debug with kaslr, it is sometimes necessary to have PHYS_OFFSET to
> > > perform linear virtual address to physical address translation.
> > > Sometimes we're debugging with only few information such as a kernel log
> > > and a symbol file, print PHYS_OFFSET in dump_kernel_offset() for that case.
> > >
> > > Tested by:
> > > echo c > /proc/sysrq-trigger
> > > [ 11.996161] SMP: stopping secondary CPUs
> > > [ 11.996732] Kernel Offset: 0x2522200000 from 0xffffff8008000000
> > > [ 11.996881] PHYS_OFFSET: 0xffffffeb40000000
> > >
> > > Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> > > Tested-by: Miles Chen <miles.chen@mediatek.com>
>
> Fine with me, but I would like to see an ack from Miles Chen :-)
Can I ack my own patch?
Acked-by:Miles Chen <miles.chen@mediatek.com>
>
> > > ---
> > > arch/arm64/kernel/setup.c | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> > > index f4fc1e0544b7..4b0e1231625c 100644
> > > --- a/arch/arm64/kernel/setup.c
> > > +++ b/arch/arm64/kernel/setup.c
> > > @@ -388,6 +388,7 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
> > > if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
> > > pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
> > > offset, KIMAGE_VADDR);
> > > + pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
> > > } else {
> > > pr_emerg("Kernel Offset: disabled\n");
> > > }
> > > --
> > > 2.18.0
> > >
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-12-12 10:56 [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset() Miles Chen
2018-12-13 18:13 ` Will Deacon
2018-12-13 18:15 ` Ard Biesheuvel
2018-12-14 0:52 ` Miles Chen
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