On powerPC systems, the Hardware Management Console (HMC) is used
to create and manage logical partitions (LPAR) and both HMC and
LPARs exchange information over Ethernet which can expose security
implications. Hence the current method of communication is not
viable for secure boot configuration.
The partition uses “Hypervisor Pipe OS Enablement Notification”
system parameter token (value = 64) to enable / disable hvpipe in
the hypervisor. Once hvpipe is enabled, the hypervisor notifies
OS if the payload is pending for that partition from any source.
This system parameter token takes 1 byte
The hypervisor signals the OS via a Hypervisor Pipe Event external
interrupt when data is available to be received from the pipe.
Then the OS should call RTAS check-exception and provide the input
Event Mask as defined for the ‘ibm,hvpipe-msg-events’. In response,
check-exception will return an ev
The hypervisor assigns one pipe per partition for all sources and
assigns new pipe after migration. Also the partition ID that is
used by source as its target ID may be changed after the migration.
So disable hvpipe during SUSPEND event with ‘hvpipe enable’ system
parameter value = 0 and enable it
The user space polls on the wait_queue for the payload from the
specific source. The hypervisor interrupts the OS when the pipe
status for the specific source is changed such as payload is
available for the partition or pipe to the source is closed. The
OS retrieves the HVPIPE event message with ch
The hypervisor provides ibm,send-hvpipe-msg and
ibm,receive-hvpipe-msg RTAS calls which can be used by the
partition to communicate through an inband hypervisor channel with
different external sources such as Hardware Management Console
(HMC). The information exchanged, whether it be messages, raw
ibm,receive-hvpipe-msg RTAS call is used to receive data from the
source (Ex: Hardware Management Console) over the hypervisor
pipe. The hypervisor will signal the OS via a Hypervisor Pipe
Event external interrupt when data is available to be received
from the pipe and the event message has the sou
ibm,send-hvpipe-msg RTAS call is used to send data to the source
(Ex: Hardware Management Console) over the hypervisor pipe. The
maximum data length of 4048 bytes is supported with this RTAS call
right now. The user space uses write() to send this payload which
invokes this RTAS. Then the write ret
Define HVPIPE specific macros which are needed to support
ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg RTAS calls
and used to handle HVPIPE message events.
Signed-off-by: Haren Myneni
Reviewed-by: Mahesh Salgaonkar
Reviewed-by: Tyrel Datwyler
Tested-by: Shashank MS
---
arch/powerpc/include/
PowerPC FW introduced HVPIPE RTAS calls such as
ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg for the user space
to exchange information with different sources such as Hardware
Management Consoles (HMC).
HVPIPE_IOC_CREATE_HANDLE is defined to use /dev/papr-hvpipe
interface for ibm,send-hvpipe-msg
On Sat, 2025-09-06 at 08:42 +0200, Christophe Leroy wrote:
> > arch_jump_label_transform() is mainly getting called from
> > __jump_level_update() and it's used for enabling or updating static keys /
> > branch.
> >
> > But static keys can also be used by drivers / module subsystem whose
> > initi
If patch_branch() or patch_instruction() fails while updating a jump
label, we presently fail silently, leading to unpredictable behaviour
later on.
Change arch_jump_label_transform() to panic on a code patching failure,
matching the existing behaviour of arch_static_call_transform().
Reported-by
On 9/4/25 2:15 PM, Christophe Leroy wrote:
>
>
> Le 04/09/2025 à 10:40, Madhavan Srinivasan a écrit :
>>
>>
>> On 9/4/25 1:01 PM, Christophe Leroy wrote:
>>> Hi Erhard,
>>>
>>> Le 04/09/2025 à 00:44, Erhard Furtner a écrit :
Greetings!
In a conversation with Andrew about his pag
This patchset converts all remaining cpufreq users to rely on the
__free(put_cpufreq_policy) annotation for policy references, instead of
calling cpufreq_cpu_put() manually.
Motivation:
- Reduce the chance of reference counting mistakes
- Make the code more consistent with the latest kernel style
Am Wed, 3 Sep 2025 21:17:32 +0800
schrieb Zihuan Zhang :
> Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
> annotation for policy references. This reduces the risk of reference
> counting mistakes and aligns the code with the latest kernel style.
>
> No functional change in
On Wed, Sep 03, 2025 at 04:37:49PM +0800, Wei Fang wrote:
> Since the generic debugfs interfaces for setting the periodic pulse
> signal loopback have been added to the ptp_clock driver, so covert the
s/covert/convert/
Also, 'since' doesn't go along with 'so'. You can remove either word.
> vendo
Hi Vishal,
On 9/3/25 20:59, Vishal Moola (Oracle) wrote:
free_pages() should be used when we only have a virtual address. We
should call __free_pages() directly on our page instead.
Signed-off-by: Vishal Moola (Oracle)
---
arch/riscv/mm/init.c | 4 ++--
1 file changed, 2 insertions(+), 2 de
On Thu, Sep 04, 2025 at 01:55:43AM +, Wei Fang wrote:
> Vladimir helped explain its purpose in the thread, do you still think
> it is pointless?
Vladimir gave practical examples for the use case, so no objection
from my side. I just wanted to understand how this is useful.
Next time, it woul
On Fri, Sep 5, 2025 at 3:24 PM Zihuan Zhang wrote:
>
> Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
> annotation for policy references. This reduces the risk of reference
> counting mistakes and aligns the code with the latest kernel style.
>
> No functional change intended
On Thu, Sep 04, 2025 at 02:51:14PM +0300, Mike Rapoport wrote:
> On Wed, Sep 03, 2025 at 11:59:17AM -0700, Vishal Moola (Oracle) wrote:
> > free_pages() should be used when we only have a virtual address. We
> > should call __free_pages() directly on our page instead.
> >
> > Signed-off-by: Vishal
Since the generic debugfs interfaces for setting the periodic pulse
signal loopback have been added to the ptp_clock driver, so convert
the vendor-defined debugfs interfaces to the generic interfaces.
Signed-off-by: Wei Fang
Reviewed-by: Vladimir Oltean
Tested-by: Vladimir Oltean
---
MAINTAINE
LLVM generates bpf_addr_space_cast instruction while translating
pointers between native (zero) address space and
__attribute__((address_space(N))). The addr_space=0 is reserved as
bpf_arena address space.
rY = addr_space_cast(rX, 0, 1) is processed by the verifier and
converted to normal 32-bit m
Christophe Leroy writes:
> PAGE_KERNEL_TEXT is an old macro that is used to tell kernel whether
> kernel text has to be mapped read-only or read-write based on build
> time options.
>
> But nowadays, with functionnalities like jump_labels, static links,
> etc ... more only less all kernels need t
The partition uses “Hypervisor Pipe OS Enablement Notification”
system parameter token (value = 64) to enable / disable hvpipe in
the hypervisor. Once hvpipe is enabled, the hypervisor notifies
OS if the payload is pending for that partition from any source.
This system parameter token takes 1 byte
On Thu, Sep 04, 2025 at 01:39:31PM +0530, Hari Bathini wrote:
>
>
> On 29/08/25 10:21 pm, Saket Kumar Bhaskar wrote:
> > For systems having CONFIG_NR_CPUS set to > 1024 in kernel config
> > the selftest fails as arena_spin_lock_irqsave() returns EOPNOTSUPP.
> >
> > The selftest is skipped incase
it/powerpc/linux.git next
patch link:
https://lore.kernel.org/r/20250906155308.705926-5-haren%40linux.ibm.com
patch subject: [PATCH v5 4/9] powerpc/pseries: Send payload with
ibm,send-hvpipe-msg RTAS
config: powerpc64-randconfig-r123-20250907
(https://download.01.org/0day-ci/archive/20250907/20
Hi,
I'm a present maintainer of Linux FireWire subsystem, and recent years
have been working to modernize the subsystem.
On Fri, Sep 05, 2025 at 14:43:24PM -0300, Jason Gunthorpe wrote:
> There is only one user I found of alloc_pages:
>
> drivers/firewire/ohci.c:ctx->pages[i] = dm
On 8/30/25 11:33 AM, Haren Myneni wrote:
> The hypervisor signals the OS via a Hypervisor Pipe Event external
> interrupt when data is available to be received from the pipe.
> Then the OS should call RTAS check-exception and provide the input
> Event Mask as defined for the ‘ibm,hvpipe-msg-eve
Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
annotation for policy references. This reduces the risk of reference
counting mistakes and aligns the code with the latest kernel style.
No functional change intended.
Signed-off-by: Zihuan Zhang
Reviewed-by: Jonathan Cameron
PowerPC FW introduced HVPIPE RTAS calls such as
ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg for the user space
to exchange information with different sources such as Hardware
Management Consoles (HMC).
HVPIPE_IOC_CREATE_HANDLE is defined to use /dev/papr-hvpipe
interface for ibm,send-hvpipe-msg
Le 04/09/2025 à 11:57, Andrew Donnellan a écrit :
On Thu, 2025-09-04 at 14:33 +0530, Madhavan Srinivasan wrote:
I am using qemu with -M mac99 and it boots
Hardware name: PowerMac3,1 7400 0xc0209 PowerMac
printk: legacy bootconsole [udbg0] enabled
-
On Wed, Sep 03, 2025 at 11:59:14AM -0700, Vishal Moola (Oracle) wrote:
> free_pages() is supposed to be called when we only have a virtual address.
> __free_pages() is supposed to be called when we have a page.
>
> There are a number of callers that use page_address() to get a page's
> virtual add
On Wed, 3 Sep 2025 21:17:26 +0800
Zihuan Zhang wrote:
> Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
> annotation for policy references. This reduces the risk of reference
> counting mistakes and aligns the code with the latest kernel style.
>
> No functional change inte
The existing code for emitting bpf atomic instruction sequences for
atomic operations such as XCHG, CMPXCHG, ADD, AND, OR, and XOR has been
refactored into a reusable function, bpf_jit_emit_ppc_atomic_op().
It also computes the jump offset and tracks the instruction index for jited
LDARX/LWARX to b
On Fri, Sep 05, 2025 at 06:20:51PM +0200, Marek Szyprowski wrote:
> On 29.08.2025 15:16, Jason Gunthorpe wrote:
> > On Tue, Aug 19, 2025 at 08:36:44PM +0300, Leon Romanovsky wrote:
> >
> >> This series does the core code and modern flows. A followup series
> >> will give the same treatment to the l
cc-13
i386buildonly-randconfig-001-20250906clang-20
i386buildonly-randconfig-001-20250907clang-20
i386buildonly-randconfig-002-20250906gcc-11
i386buildonly-randconfig-002-20250907clang-20
i386buildonly-randconfig-003-20250906gcc-13
i386
On Wed, Sep 03, 2025 at 11:59:21AM -0700, Vishal Moola (Oracle) wrote:
> free_pages() should be used when we only have a virtual address. We
> should call __free_pages() directly on our page instead.
>
> Signed-off-by: Vishal Moola (Oracle)
Acked-by: Michael S. Tsirkin
> ---
> drivers/virtio/
On 22/04/25 08:06, Ben Collins wrote:
Certain versions of kexec don't even work without kernel-end being
added to the device-tree. Add it even if crash-kernel is disabled.
Signed-off-by: Ben Collins
Cc: Madhavan Srinivasan
Cc: Michael Ellerman
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-ke
it/powerpc/linux.git next
patch link:
https://lore.kernel.org/r/20250906155308.705926-4-haren%40linux.ibm.com
patch subject: [PATCH v5 3/9] powerpc/pseries: Add papr-hvpipe char driver for
HVPIPE interfaces
config: powerpc64-randconfig-r123-20250907
(https://download.01.org/0day-ci/archiv
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