The idle entry/exit code saves/restores GPRs in the stack "red zone"
(Protected Zone according to PowerPC64 ELF ABI v2). However, the offset
used for the first GPR is incorrect and overwrites the back chain - the
Protected Zone actually starts below the current SP. In practice this is
probably not
Excerpts from Leonardo Bras's message of February 5, 2021 5:01 pm:
> Hey Nick, thanks for reviewing :)
>
> On Fri, 2021-02-05 at 16:28 +1000, Nicholas Piggin wrote:
>> Excerpts from Leonardo Bras's message of February 5, 2021 4:06 pm:
>> > Before guest entry, TBU40 register is changed to reflect g
This fix the bad fault reported by KUAP when io_wqe_worker access userspace.
Bug: Read fault blocked by KUAP!
WARNING: CPU: 1 PID: 101841 at arch/powerpc/mm/fault.c:229
__do_page_fault+0x6b4/0xcd0
NIP [c009e7e4] __do_page_fault+0x6b4/0xcd0
LR [c009e7e0] __do_page_fault+0x6b0/0
Excerpts from Michael Ellerman's message of February 6, 2021 9:38 am:
> Nicholas Piggin writes:
>> Excerpts from Michael Ellerman's message of February 4, 2021 8:15 pm:
>>> Nicholas Piggin writes:
This moves the common NMI entry and exit code into the interrupt handler
wrappers.
>>
Excerpts from Christophe Leroy's message of February 5, 2021 6:09 pm:
>
>
> Le 30/01/2021 à 14:08, Nicholas Piggin a écrit :
>> Signed-off-by: Nicholas Piggin
>> ---
>
>> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
>> index f70d3f6174c8..7ff915aae8ec 100644
>> --- a/a
Excerpts from Christophe Leroy's message of February 5, 2021 6:56 pm:
> For unimplemented instructions or unimplemented SPRs, the 8xx triggers
> a "Software Emulation Exception" (0x1000). That interrupt doesn't set
> reason bits in SRR1 as the "Program Check Exception" does.
>
> Go through emulati
Excerpts from Christophe Leroy's message of February 5, 2021 4:04 pm:
>
>
> Le 05/02/2021 à 03:16, Nicholas Piggin a écrit :
>> Excerpts from Michael Ellerman's message of February 5, 2021 10:22 am:
>>> Nicholas Piggin writes:
Excerpts from Christophe Leroy's message of February 4, 2021 6:0
Nicholas Piggin writes:
> Excerpts from Michael Ellerman's message of February 4, 2021 8:15 pm:
>> Nicholas Piggin writes:
>>> This moves the common NMI entry and exit code into the interrupt handler
>>> wrappers.
>>>
>>> This changes the behaviour of soft-NMI (watchdog) and HMI interrupts, and
>
Nicholas Piggin writes:
> Excerpts from Leonardo Bras's message of February 5, 2021 4:06 pm:
>> Before guest entry, TBU40 register is changed to reflect guest timebase.
>> After exitting guest, the register is reverted to it's original value.
>>
>> If one tries to get the timestamp from host betw
Nicholas Piggin writes:
> Rather than bifurcate the call depending on whether or not HV is
> possible, and have the HV entry test for PR, just make a single
> common point which does the demultiplexing. This makes it simpler
> to add another type of exit handler.
>
> Signed-off-by: Nicholas Piggi
Hello Fabiano,
Thanks for reviewing!
(answers inline)
On Fri, 2021-02-05 at 10:09 -0300, Fabiano Rosas wrote:
> Leonardo Bras writes:
>
> > Before guest entry, TBU40 register is changed to reflect guest timebase.
> > After exitting guest, the register is reverted to it's original value.
> >
>
On 1/6/21 6:59 PM, Nathan Lynch wrote:
> dlpar_configure_connector() has two problems in its handling of
> ibm,configure-connector's return status:
>
> 1. When the status is -2 (busy, call again), we call
>ibm,configure-connector again immediately without checking whether
>to schedule, whi
This fix the bad fault reported by KUAP when io_wqe_worker access userspace.
Bug: Read fault blocked by KUAP!
WARNING: CPU: 1 PID: 101841 at arch/powerpc/mm/fault.c:229
__do_page_fault+0x6b4/0xcd0
NIP [c009e7e4] __do_page_fault+0x6b4/0xcd0
LR [c009e7e0] __do_page_fault+0x6b0/0
On 2/5/21 9:49 AM, Mimi Zohar wrote:
Hi Mimi,
On Fri, 2021-02-05 at 09:39 -0800, Lakshmi Ramasubramanian wrote:
On 2/5/21 2:05 AM, Greg KH wrote:
On Thu, Feb 04, 2021 at 09:49:50AM -0800, Lakshmi Ramasubramanian wrote:
IMA allocates kernel virtual memory to carry forward the measurement
list
On Fri, 2021-02-05 at 09:39 -0800, Lakshmi Ramasubramanian wrote:
> On 2/5/21 2:05 AM, Greg KH wrote:
> > On Thu, Feb 04, 2021 at 09:49:50AM -0800, Lakshmi Ramasubramanian wrote:
> >> IMA allocates kernel virtual memory to carry forward the measurement
> >> list, from the current kernel to the next
[ add Andrew ]
On Thu, Feb 4, 2021 at 6:40 PM Aneesh Kumar K.V
wrote:
>
> Differentiate between hardware not supporting hugepages and user disabling THP
> via 'echo never > /sys/kernel/mm/transparent_hugepage/enabled'
>
> For the devdax namespace, the kernel handles the above via the
> supported_
On 2/5/21 2:05 AM, Greg KH wrote:
On Thu, Feb 04, 2021 at 09:49:50AM -0800, Lakshmi Ramasubramanian wrote:
IMA allocates kernel virtual memory to carry forward the measurement
list, from the current kernel to the next kernel on kexec system call,
in ima_add_kexec_buffer() function. In error cod
These machines don't support running both MMU types at the same time,
so remove the KVM_CAP_PPC_MMU_HASH_V3 capability when the host is
using Radix MMU.
Signed-off-by: Fabiano Rosas
---
arch/powerpc/include/asm/kvm_ppc.h | 1 +
arch/powerpc/kvm/book3s_hv.c | 10 ++
arch/powerpc/kv
On Fri, Feb 05, 2021 at 07:19:36PM +0530, Aneesh Kumar K.V wrote:
> Zorro Lang writes:
>
>
>
> > ...
> > [ 530.180466] run fstests generic/617 at 2021-02-05 03:41:10
> > [ 530.707969] [ cut here ]
> > [ 530.708006] kernel BUG at arch/powerpc/include/asm/book3s/64/
On Fri, Feb 5, 2021 at 7:28 AM Bjorn Helgaas wrote:
>
> [+cc Alex]
>
> On Thu, Jan 28, 2021 at 12:09:37PM +0800, Kai-Heng Feng wrote:
> > On Thu, Jan 28, 2021 at 4:51 AM Bjorn Helgaas wrote:
> > > On Thu, Jan 28, 2021 at 01:31:00AM +0800, Kai-Heng Feng wrote:
> > > > Commit 50310600ebda ("iommu/v
Zorro Lang writes:
> ...
> [ 530.180466] run fstests generic/617 at 2021-02-05 03:41:10
> [ 530.707969] [ cut here ]
> [ 530.708006] kernel BUG at arch/powerpc/include/asm/book3s/64/kup.h:207!
> [ 530.708013] Oops: Exception in kernel mode, sig: 5 [#1]
> [ 530.7
Nathan Lynch writes:
> dlpar_configure_connector() has two problems in its handling of
> ibm,configure-connector's return status:
>
> 1. When the status is -2 (busy, call again), we call
>ibm,configure-connector again immediately without checking whether
>to schedule, which can result in m
Leonardo Bras writes:
> Before guest entry, TBU40 register is changed to reflect guest timebase.
> After exitting guest, the register is reverted to it's original value.
>
> If one tries to get the timestamp from host between those changes, it
> will present an incorrect value.
>
> An example wou
On Thu, Feb 04, 2021 at 09:49:51AM -0800, Lakshmi Ramasubramanian wrote:
> IMA allocates kernel virtual memory to carry forward the measurement
> list, from the current kernel to the next kernel on kexec system call,
> in ima_add_kexec_buffer() function. This buffer is not freed before
> completin
On Thu, Feb 04, 2021 at 09:49:50AM -0800, Lakshmi Ramasubramanian wrote:
> IMA allocates kernel virtual memory to carry forward the measurement
> list, from the current kernel to the next kernel on kexec system call,
> in ima_add_kexec_buffer() function. In error code paths this memory
> is not fr
On Fri, Feb 05, 2021 at 08:34:26AM +0530, Aneesh Kumar K.V wrote:
> This fix the bad fault reported by KUAP when io_wqe_worker access userspace.
>
> Bug: Read fault blocked by KUAP!
> WARNING: CPU: 1 PID: 101841 at arch/powerpc/mm/fault.c:229
> __do_page_fault+0x6b4/0xcd0
> NIP [c009e7
Hi Anshuman,
On 2/5/21 4:10 AM, Anshuman Khandual wrote:
> early_memtest() does not get called from all architectures. Hence enabling
> CONFIG_MEMTEST and providing a valid memtest=[1..N] kernel command line
> option might not trigger the memory pattern tests as would be expected in
> normal circu
While sampling for marked events, currently we record the sample only
if the SIAR valid bit of Sampled Instruction Event Register (SIER) is
set. SIAR_VALID bit is used for fetching the instruction address from
Sampled Instruction Address Register(SIAR). But there are some usecases,
where the user i
For unimplemented instructions or unimplemented SPRs, the 8xx triggers
a "Software Emulation Exception" (0x1000). That interrupt doesn't set
reason bits in SRR1 as the "Program Check Exception" does.
Go through emulation_assist_interrupt() to set REASON_ILLEGAL.
Fixes: fbbcc3bb139e ("powerpc/8xx:
On 05.02.21 03:39, Aneesh Kumar K.V wrote:
Differentiate between hardware not supporting hugepages and user disabling THP
via 'echo never > /sys/kernel/mm/transparent_hugepage/enabled'
For the devdax namespace, the kernel handles the above via the
supported_alignment attribute and failing to ini
On 05/02/21 12:51 pm, Christophe Leroy wrote:
> Please provide some description of the change.
>
> And please clarify the patch subject, because as far as I can see, the return
> is already checked allthough the check seams wrong.
This was my first patch. I will try to provide better description
Le 30/01/2021 à 14:08, Nicholas Piggin a écrit :
Signed-off-by: Nicholas Piggin
---
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index f70d3f6174c8..7ff915aae8ec 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1462,7 +1474,7 @@ st
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