On 10/18/23 2:10 PM, Nathan Lynch wrote:
Haren Myneni writes:
The hypervisor returns migration failure if all VAS windows are not
closed. During pre-migration stage, vas_migration_handler() sets
migration_in_progress flag and closes all windows from the list.
The allocate VAS window routine
On Thu, Oct 12, 2023 at 10:45:02AM +0530, Anup Patel wrote:
> We add SBI debug console extension related defines/enum to the
> asm/sbi.h header.
>
> Signed-off-by: Anup Patel
> ---
> arch/riscv/include/asm/sbi.h | 7 +++
> 1 file changed, 7 insertions(+)
>
> diff --git a/arch/riscv/include/
On Thu, Oct 12, 2023 at 10:45:03AM +0530, Anup Patel wrote:
> We will be implementing SBI DBCN extension for KVM RISC-V so let
> us change the KVM RISC-V SBI specification version to v2.0.
>
> Signed-off-by: Anup Patel
> ---
> arch/riscv/include/asm/kvm_vcpu_sbi.h | 2 +-
> 1 file changed, 1 ins
On Thu, Oct 19, 2023 at 03:38:40PM +1100, Michael Ellerman wrote:
> Srikar Dronamraju writes:
> > If there are shared processor LPARs, underlying Hypervisor can have more
> > virtual cores to handle than actual physical cores.
> >
> > Starting with Power 9, a core has 2 nearly independent thread g
On Thu, Oct 19, 2023 at 03:48:48PM +1100, Michael Ellerman wrote:
> Srikar Dronamraju writes:
> > Like L2-cache info, coregroup information which is used to determine MC
> > sched domains is only present on dedicated LPARs. i.e PowerVM doesn't
> > export coregroup information for shared processor
On Wed, Oct 18, 2023 at 10:07:45PM +0530, Srikar Dronamraju wrote:
> There are some variables that are only updated at boot time.
> So add read_mostly attribute to such variables
You don't have __ro_after_init ?
On Thu, Oct 12, 2023 at 10:45:04AM +0530, Anup Patel wrote:
> Currently, all SBI extensions are enabled by default which is
> problematic for SBI extensions (such as DBCN) which are forwarded
> to the KVM user-space because we might have an older KVM user-space
> which is not aware/ready to handle
On Thu, Oct 12, 2023 at 10:45:05AM +0530, Anup Patel wrote:
> The frozen SBI v2.0 specification defines the SBI debug console
> (DBCN) extension which replaces the legacy SBI v0.1 console
> functions namely sbi_console_getchar() and sbi_console_putchar().
>
> The SBI DBCN extension needs to be emu
On Thu, Oct 12, 2023 at 10:45:06AM +0530, Anup Patel wrote:
> The functions sbi_console_putchar() and sbi_console_getchar() are
> not defined when CONFIG_RISCV_SBI_V01 is disabled so let us add
> inline version of these functions to avoid "#ifdef" on user side.
nit: Here and in the summary I'd pro
On Thu, Oct 12, 2023 at 10:45:07AM +0530, Anup Patel wrote:
> We extend the existing RISC-V SBI earlycon support to use the new
> RISC-V SBI debug console extension.
>
> Signed-off-by: Anup Patel
> ---
> drivers/tty/serial/Kconfig | 2 +-
> drivers/tty/serial/earlycon-riscv-sbi.c |
On Thu, Oct 12, 2023 at 10:45:09AM +0530, Anup Patel wrote:
> Let us enable SBI based earlycon support in defconfigs for both RV32
> and RV64 so that "earlycon=sbi" can be used again.
>
> Signed-off-by: Anup Patel
> ---
> arch/riscv/configs/defconfig | 1 +
> arch/riscv/configs/rv32_defconf
PowerVM Hypervisor dispatches on a whole core basis. In a shared LPAR, a
CPU from a core that is CEDED or preempted may have a larger latency. In
such a scenario, its preferable to choose a different CPU to run.
If one of the CPUs in the core is active, i.e neither CEDED nor
preempted, then consid
PowerVM Hypervisor dispatches on a whole core basis. In a shared LPAR, a
CPU from a core that is CEDED or preempted may have a larger latency. In
such a scenario, its preferable to choose a different CPU to run.
If one of the CPUs in the core is active, i.e neither CEDED nor
preempted, then consid
On Thu, Oct 12, 2023 at 10:45:05AM +0530, Anup Patel wrote:
> The frozen SBI v2.0 specification defines the SBI debug console
> (DBCN) extension which replaces the legacy SBI v0.1 console
> functions namely sbi_console_getchar() and sbi_console_putchar().
>
> The SBI DBCN extension needs to be emu
On Wed, Oct 18, 2023 at 3:58 PM Hans Verkuil wrote:
>
> On 18/10/2023 09:40, Shengjiu Wang wrote:
> > On Wed, Oct 18, 2023 at 3:31 PM Hans Verkuil wrote:
> >>
> >> On 18/10/2023 09:23, Shengjiu Wang wrote:
> >>> On Wed, Oct 18, 2023 at 10:27 AM Shengjiu Wang
> >>> wrote:
>
> On Tue, O
On 19/10/2023 12:44, Shengjiu Wang wrote:
> On Wed, Oct 18, 2023 at 3:58 PM Hans Verkuil wrote:
>>
>> On 18/10/2023 09:40, Shengjiu Wang wrote:
>>> On Wed, Oct 18, 2023 at 3:31 PM Hans Verkuil wrote:
On 18/10/2023 09:23, Shengjiu Wang wrote:
> On Wed, Oct 18, 2023 at 10:27 AM Shengj
On 10/18/23 10:07 PM, Srikar Dronamraju wrote:
> The ability to detect if the system is running in a shared processor
> mode is helpful in few more generic cases not just in
> paravirtualization.
> For example: At boot time, different scheduler/ topology flags may be
> set based on the processor
allnoconfig gcc
arc allyesconfig gcc
arc defconfig gcc
arc randconfig-001-20231018 gcc
arc randconfig-001-20231019 gcc
arm
Peter Zijlstra writes:
> On Thu, Oct 19, 2023 at 03:38:40PM +1100, Michael Ellerman wrote:
>> Srikar Dronamraju writes:
>> > If there are shared processor LPARs, underlying Hypervisor can have more
>> > virtual cores to handle than actual physical cores.
>> >
>> > Starting with Power 9, a core ha
allnoconfig gcc
arc allyesconfig gcc
arc defconfig gcc
arc randconfig-001-20231018 gcc
arc randconfig-001-20231019 gcc
arm
Kuan-Wei Chiu writes:
> On Thu, Oct 19, 2023 at 12:41:45PM +1100, Michael Ellerman wrote:
>> Kuan-Wei Chiu writes:
>> > This patch improves the performance of event alternative lookup by
>> > replacing the previous linear search with a more efficient binary
>> > search. This change reduces the ti
* Peter Zijlstra [2023-10-19 09:48:28]:
> On Thu, Oct 19, 2023 at 03:38:40PM +1100, Michael Ellerman wrote:
> > Srikar Dronamraju writes:
> > > If there are shared processor LPARs, underlying Hypervisor can have more
> > > virtual cores to handle than actual physical cores.
> > >
> > > Starting
* Peter Zijlstra [2023-10-19 09:51:27]:
> On Wed, Oct 18, 2023 at 10:07:45PM +0530, Srikar Dronamraju wrote:
> > There are some variables that are only updated at boot time.
> > So add read_mostly attribute to such variables
>
> You don't have __ro_after_init ?
Michael also responded with the s
* Michael Ellerman [2023-10-19 15:41:40]:
> Srikar Dronamraju writes:
> > The ability to detect if the system is running in a shared processor
> > mode is helpful in few more generic cases not just in
> > paravirtualization.
> > For example: At boot time, different scheduler/ topology flags may
* Michael Ellerman [2023-10-19 15:48:48]:
> Srikar Dronamraju writes:
> > Like L2-cache info, coregroup information which is used to determine MC
> > sched domains is only present on dedicated LPARs. i.e PowerVM doesn't
> > export coregroup information for shared processor LPARs. Hence disable
>
* Peter Zijlstra [2023-10-19 09:50:46]:
> On Thu, Oct 19, 2023 at 03:48:48PM +1100, Michael Ellerman wrote:
> > Srikar Dronamraju writes:
> > > Like L2-cache info, coregroup information which is used to determine MC
> > > sched domains is only present on dedicated LPARs. i.e PowerVM doesn't
> >
On Thu, Oct 19, 2023 at 04:07:35AM +0800, kernel test robot wrote:
> arch/s390/include/asm/ctlreg.h:129:9: warning: array subscript 0 is outside
> array bounds of 'struct ctlreg[0]' [-Warray-bounds=]
> arch/s390/include/asm/ctlreg.h:80:9: warning: array subscript 0 is outside
> array bounds of 's
On 10/18/23 10:07 PM, Srikar Dronamraju wrote:
> If there are shared processor LPARs, underlying Hypervisor can have more
> virtual cores to handle than actual physical cores.
>
> Starting with Power 9, a core has 2 nearly independent thread groups.
> On a shared processors LPARs, it helps to p
The VAS open window call prints error message and returns -EBUSY
after the migration suspend event initiated and until the resume
event completed on the destination system. It can cause the log
buffer filled with these error messages if the user space issues
continuous open window calls. Similar c
On Thu, Oct 19, 2023 at 05:32:05PM +0200, Heiko Carstens wrote:
> On Thu, Oct 19, 2023 at 04:07:35AM +0800, kernel test robot wrote:
> > arch/s390/include/asm/ctlreg.h:129:9: warning: array subscript 0 is outside
> > array bounds of 'struct ctlreg[0]' [-Warray-bounds=]
> > arch/s390/include/asm/ct
The hypervisor returns migration failure if all VAS windows are not
closed. During pre-migration stage, vas_migration_handler() sets
migration_in_progress flag and closes all windows from the list.
The allocate VAS window routine checks the migration flag, setup
the window and then add it to the li
On Thu, Oct 19, 2023 at 1:27 PM Andrew Jones wrote:
>
> On Thu, Oct 12, 2023 at 10:45:04AM +0530, Anup Patel wrote:
> > Currently, all SBI extensions are enabled by default which is
> > problematic for SBI extensions (such as DBCN) which are forwarded
> > to the KVM user-space because we might hav
* Shrikanth Hegde [2023-10-19 21:26:56]:
>
>
> On 10/18/23 10:07 PM, Srikar Dronamraju wrote:
> > If there are shared processor LPARs, underlying Hypervisor can have more
> > virtual cores to handle than actual physical cores.
> >
> > Starting with Power 9, a core has 2 nearly independent thre
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