* [PATCH v2] arm64: SSBS/DIT: print SSBS and DIT bit when printing PSTATE
@ 2021-07-21 2:43 Shaokun Zhang
2021-07-21 8:31 ` Vladimir Murzin
0 siblings, 1 reply; 3+ messages in thread
From: Shaokun Zhang @ 2021-07-21 2:43 UTC (permalink / raw)
To: linux-arm-kernel
Cc: Lingyan Huang, Vladimir Murzin, Catalin Marinas, Will Deacon,
Shaokun Zhang
From: Lingyan Huang <huanglingyan2@huawei.com>
The current code to print PSTATE when generating backtraces does not
include SSBS bit and DIT bit, so add this information.
Cc: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Lingyan Huang <huanglingyan2@huawei.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
---
ChangeLog:
v1-->v2:
1. Address Vladimir's comment on update compat_user_mode
arch/arm64/kernel/process.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index c8989b999250..3da2ad00fa0c 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -163,7 +163,7 @@ static void print_pstate(struct pt_regs *regs)
u64 pstate = regs->pstate;
if (compat_user_mode(regs)) {
- printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c)\n",
+ printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c %cPAN %cDIT %cSSBS)\n",
pstate,
pstate & PSR_AA32_N_BIT ? 'N' : 'n',
pstate & PSR_AA32_Z_BIT ? 'Z' : 'z',
@@ -174,12 +174,15 @@ static void print_pstate(struct pt_regs *regs)
pstate & PSR_AA32_E_BIT ? "BE" : "LE",
pstate & PSR_AA32_A_BIT ? 'A' : 'a',
pstate & PSR_AA32_I_BIT ? 'I' : 'i',
- pstate & PSR_AA32_F_BIT ? 'F' : 'f');
+ pstate & PSR_AA32_F_BIT ? 'F' : 'f',
+ pstate & PSR_AA32_PAN_BIT ? '+' : '-',
+ pstate & PSR_AA32_DIT_BIT ? '+' : '-',
+ pstate & PSR_AA32_SSBS_BIT ? '+' : '-');
} else {
const char *btype_str = btypes[(pstate & PSR_BTYPE_MASK) >>
PSR_BTYPE_SHIFT];
- printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO %cTCO BTYPE=%s)\n",
+ printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO %cTCO %cDIT %cSSBS BTYPE=%s)\n",
pstate,
pstate & PSR_N_BIT ? 'N' : 'n',
pstate & PSR_Z_BIT ? 'Z' : 'z',
@@ -192,6 +195,8 @@ static void print_pstate(struct pt_regs *regs)
pstate & PSR_PAN_BIT ? '+' : '-',
pstate & PSR_UAO_BIT ? '+' : '-',
pstate & PSR_TCO_BIT ? '+' : '-',
+ pstate & PSR_DIT_BIT ? '+' : '-',
+ pstate & PSR_SSBS_BIT ? '+' : '-',
btype_str);
}
}
--
2.7.4
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^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v2] arm64: SSBS/DIT: print SSBS and DIT bit when printing PSTATE
2021-07-21 2:43 [PATCH v2] arm64: SSBS/DIT: print SSBS and DIT bit when printing PSTATE Shaokun Zhang
@ 2021-07-21 8:31 ` Vladimir Murzin
2021-07-21 10:25 ` Will Deacon
0 siblings, 1 reply; 3+ messages in thread
From: Vladimir Murzin @ 2021-07-21 8:31 UTC (permalink / raw)
To: Shaokun Zhang, linux-arm-kernel
Cc: Lingyan Huang, Catalin Marinas, Will Deacon
On 7/21/21 3:43 AM, Shaokun Zhang wrote:
> From: Lingyan Huang <huanglingyan2@huawei.com>
>
> The current code to print PSTATE when generating backtraces does not
> include SSBS bit and DIT bit, so add this information.
>
> Cc: Vladimir Murzin <vladimir.murzin@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Signed-off-by: Lingyan Huang <huanglingyan2@huawei.com>
> Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
> ---
> ChangeLog:
> v1-->v2:
> 1. Address Vladimir's comment on update compat_user_mode
>
> arch/arm64/kernel/process.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index c8989b999250..3da2ad00fa0c 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -163,7 +163,7 @@ static void print_pstate(struct pt_regs *regs)
> u64 pstate = regs->pstate;
>
> if (compat_user_mode(regs)) {
> - printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c)\n",
> + printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c %cPAN %cDIT %cSSBS)\n",
> pstate,
> pstate & PSR_AA32_N_BIT ? 'N' : 'n',
> pstate & PSR_AA32_Z_BIT ? 'Z' : 'z',
> @@ -174,12 +174,15 @@ static void print_pstate(struct pt_regs *regs)
> pstate & PSR_AA32_E_BIT ? "BE" : "LE",
> pstate & PSR_AA32_A_BIT ? 'A' : 'a',
> pstate & PSR_AA32_I_BIT ? 'I' : 'i',
> - pstate & PSR_AA32_F_BIT ? 'F' : 'f');
> + pstate & PSR_AA32_F_BIT ? 'F' : 'f',
> + pstate & PSR_AA32_PAN_BIT ? '+' : '-',
Hmm, commit message doesn't mention PAN bit... but I leave it to maintainers.
> + pstate & PSR_AA32_DIT_BIT ? '+' : '-',
> + pstate & PSR_AA32_SSBS_BIT ? '+' : '-');
> } else {
> const char *btype_str = btypes[(pstate & PSR_BTYPE_MASK) >>
> PSR_BTYPE_SHIFT];
>
> - printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO %cTCO BTYPE=%s)\n",
> + printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO %cTCO %cDIT %cSSBS BTYPE=%s)\n",
> pstate,
> pstate & PSR_N_BIT ? 'N' : 'n',
> pstate & PSR_Z_BIT ? 'Z' : 'z',
> @@ -192,6 +195,8 @@ static void print_pstate(struct pt_regs *regs)
> pstate & PSR_PAN_BIT ? '+' : '-',
> pstate & PSR_UAO_BIT ? '+' : '-',
> pstate & PSR_TCO_BIT ? '+' : '-',
> + pstate & PSR_DIT_BIT ? '+' : '-',
> + pstate & PSR_SSBS_BIT ? '+' : '-',
> btype_str);
> }
> }
>
FWIW,
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] arm64: SSBS/DIT: print SSBS and DIT bit when printing PSTATE
2021-07-21 8:31 ` Vladimir Murzin
@ 2021-07-21 10:25 ` Will Deacon
0 siblings, 0 replies; 3+ messages in thread
From: Will Deacon @ 2021-07-21 10:25 UTC (permalink / raw)
To: Vladimir Murzin
Cc: Shaokun Zhang, linux-arm-kernel, Lingyan Huang, Catalin Marinas
On Wed, Jul 21, 2021 at 09:31:18AM +0100, Vladimir Murzin wrote:
> On 7/21/21 3:43 AM, Shaokun Zhang wrote:
> > From: Lingyan Huang <huanglingyan2@huawei.com>
> >
> > The current code to print PSTATE when generating backtraces does not
> > include SSBS bit and DIT bit, so add this information.
> >
> > Cc: Vladimir Murzin <vladimir.murzin@arm.com>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Will Deacon <will@kernel.org>
> > Signed-off-by: Lingyan Huang <huanglingyan2@huawei.com>
> > Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
> > ---
> > ChangeLog:
> > v1-->v2:
> > 1. Address Vladimir's comment on update compat_user_mode
> >
> > arch/arm64/kernel/process.c | 11 ++++++++---
> > 1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> > index c8989b999250..3da2ad00fa0c 100644
> > --- a/arch/arm64/kernel/process.c
> > +++ b/arch/arm64/kernel/process.c
> > @@ -163,7 +163,7 @@ static void print_pstate(struct pt_regs *regs)
> > u64 pstate = regs->pstate;
> >
> > if (compat_user_mode(regs)) {
> > - printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c)\n",
> > + printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c %cPAN %cDIT %cSSBS)\n",
> > pstate,
> > pstate & PSR_AA32_N_BIT ? 'N' : 'n',
> > pstate & PSR_AA32_Z_BIT ? 'Z' : 'z',
> > @@ -174,12 +174,15 @@ static void print_pstate(struct pt_regs *regs)
> > pstate & PSR_AA32_E_BIT ? "BE" : "LE",
> > pstate & PSR_AA32_A_BIT ? 'A' : 'a',
> > pstate & PSR_AA32_I_BIT ? 'I' : 'i',
> > - pstate & PSR_AA32_F_BIT ? 'F' : 'f');
> > + pstate & PSR_AA32_F_BIT ? 'F' : 'f',
> > + pstate & PSR_AA32_PAN_BIT ? '+' : '-',
>
> Hmm, commit message doesn't mention PAN bit... but I leave it to maintainers.
Agreed, I don't see the rationale for exposing PAN for 32-bit userspace
tasks. Please drop this part for v3.
Will
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-07-21 2:43 [PATCH v2] arm64: SSBS/DIT: print SSBS and DIT bit when printing PSTATE Shaokun Zhang
2021-07-21 8:31 ` Vladimir Murzin
2021-07-21 10:25 ` Will Deacon
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