I used the unlikely() macro on the return values of the k.alloc
calls and found that it changes the code generation a bit.
Optimize all return paths of k.alloc calls by improving
branch prediction on return value of k.alloc.
Signed-off-by: Kautuk Consul
---
arch/powerpc/kvm/book3s_hv_nested.c |
On Fri, Apr 07, 2023 at 05:31:47AM -0400, Kautuk Consul wrote:
> I used the unlikely() macro on the return values of the k.alloc
> calls and found that it changes the code generation a bit.
> Optimize all return paths of k.alloc calls by improving
> branch prediction on return value of k.alloc.
Wh
On Fri, Apr 07, 2023, Bagas Sanjaya wrote:
> On Fri, Apr 07, 2023 at 05:31:47AM -0400, Kautuk Consul wrote:
> > I used the unlikely() macro on the return values of the k.alloc
> > calls and found that it changes the code generation a bit.
> > Optimize all return paths of k.alloc calls by improving
On Thu, Apr 6, 2023 at 12:50 PM Bjorn Helgaas wrote:
>
> On Fri, Mar 17, 2023 at 10:51:09AM -0700, Grant Grundler wrote:
> > From: Rajat Khandelwal
> >
> > There are many instances where correctable errors tend to inundate
> > the message buffer. We observe such instances during thunderbolt PCIe
On Fri, Apr 07, 2023 at 11:53:27AM -0700, Grant Grundler wrote:
> On Thu, Apr 6, 2023 at 12:50 PM Bjorn Helgaas wrote:
> > On Fri, Mar 17, 2023 at 10:51:09AM -0700, Grant Grundler wrote:
> > > From: Rajat Khandelwal
> > >
> > > There are many instances where correctable errors tend to inundate
>
On Tue, Apr 4, 2023 at 6:29 PM kernel test robot wrote:
>
> Hi Masahiro,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> master
> head: 76f598ba7d8e2bfb4855b5298caedd5af0c374a8
> commit: 80b6093b55e31c2c40ff082fb32523d4e
On Fri, Apr 07, 2023 at 04:08:43PM -0700, Nick Desaulniers wrote:
> On Tue, Apr 4, 2023 at 6:29 PM kernel test robot wrote:
> >
> > Hi Masahiro,
> >
> > FYI, the error/warning still remains.
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > master
> > head:
On Thu, Apr 06, 2023 at 10:51:30AM -0700, Nathan Chancellor wrote:
> When building with W=1 after commit 80b6093b55e3 ("kbuild: add -Wundef
> to KBUILD_CPPFLAGS for W=1 builds"), the following warning occurs.
>
> In file included from arch/powerpc/kvm/bookehv_interrupts.S:26:
> arch/powerpc/kv
On Mon, Mar 06, 2023, David Matlack wrote:
> David Matlack (4):
> KVM: Refactor stats descriptor generation macros
> KVM: Refactor designated initializer macros for struct _kvm_stats_desc
> KVM: Allow custom names for KVM_STAT()
> KVM: x86: Drop union for pages_{4k,2m,1g} stats
>
> arch/a
[reposting in plain text mode]
On Fri, Apr 7, 2023 at 12:46 PM Bjorn Helgaas wrote:
>
> On Fri, Apr 07, 2023 at 11:53:27AM -0700, Grant Grundler wrote:
> > On Thu, Apr 6, 2023 at 12:50 PM Bjorn Helgaas wrote:
> > > On Fri, Mar 17, 2023 at 10:51:09AM -0700, Grant Grundler wrote:
> > > > From: Ra
[reposting in plain text mode]
On Fri, Apr 7, 2023 at 12:46 PM Bjorn Helgaas wrote:
>
> On Fri, Apr 07, 2023 at 11:53:27AM -0700, Grant Grundler wrote:
> > On Thu, Apr 6, 2023 at 12:50 PM Bjorn Helgaas wrote:
> > > On Fri, Mar 17, 2023 at 10:51:09AM -0700, Grant Grundler wrote:
> > > > From: Raj
A later change moves the non-prom case to run at the virtual address
earlier, which calls for virtual TOC and kernel base. Split these two
calculations for prom and non-prom to make that change simpler.
Signed: Nicholas Piggin
---
arch/powerpc/kernel/head_64.S | 28 +++-
This won't see a lot of real use until POWER10 is the oldest supported
CPU for distros, but being as we're quite a unique user of toolchain I'd
like to start ironing things out earlier rather than later. I'm making a
list of observations here, https://github.com/linuxppc/issues/issues/455
and will
This mostly consolidates the Book3E and Book3S behaviour in boot WRT
executing from the physical or virtual address.
Book3E sets up kernel virtual linear map in start_initialization_book3e
and runs from the virtual linear alias after that. This change makes
Book3S begin to execute from the virtual
Add an option to build kernel and module with prefixed instructions if
the CPU and toolchain support it.
This is not related to kernel support for userspace execution of
prefixed instructions.
Building with prefixed instructions breaks some extended inline asm
memory addressing, for example it wi
This macro is to be used in assembly where C functions are called.
pcrel addressing mode requires branches to functions with a
localentry value of 1 to have either a trailing nop or @notoc.
This macro permits the latter without changing callers.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/in
PC-Relative or PCREL addressing is an extension to the ELF ABI which
uses Power ISA v3.1 PC-relative instructions to calculate addresses,
rather than the traditional TOC scheme.
Add an option to build vmlinux using pcrel addressing. Modules continue
to use TOC addressing.
- TOC address helpers an
Build modules using PCREL addressing when CONFIG_PPC_KERNEL_PCREL=y.
- The module loader must handle several new relocation types:
* R_PPC64_REL24_NOTOC is a function call handled like R_PPC_REL24, but
does not restore r2 upon return. The external function call stub is
changed to use pc
Nicholas Piggin writes:
> Use the preferred form of branch-and-link for finding the current
> address so objtool doesn't think it is an unannotated intra-function
> call.
We don't run objtool on this code in mainline AFAIK. Because BOOTAS
doesn't call it.
Did you actually see a warning, or are y
This series adds initial KVM selftests support for powerpc
(64-bit, BookS, radix MMU).
Since v1:
- Update MAINTAINERS KVM PPC entry to include kvm selftests.
- Fixes and cleanups from Sean's review including new patch 1.
- Add 4K guest page support requiring new patch 2.
Thanks,
Nick
Nicholas Pi
virt_arch_pgd_alloc all do the same test and set of pgd_created. Move
this into common code.
Signed-off-by: Nicholas Piggin
---
tools/testing/selftests/kvm/include/kvm_util_base.h | 5 +
tools/testing/selftests/kvm/lib/aarch64/processor.c | 4
tools/testing/selftests/kvm/lib/riscv/proce
powerpc will require this to allocate MMU tables in guest memory that
are aligned and larger than the base page size.
Signed-off-by: Nicholas Piggin
---
.../selftests/kvm/include/kvm_util_base.h | 2 +
tools/testing/selftests/kvm/lib/kvm_util.c| 44 ---
2 files changed,
Implement KVM selftests support for powerpc (Book3S-64).
ucalls are implemented with an unsuppored PAPR hcall number which causes
KVM to exit to userspace.
For now virtual memory is only implemented for the radix MMU, and only
the base page size is supported.
Guest interrupts are taken in real-m
Add tests that exercise very basic functions of the kvm selftests
framework, guest creation, ucalls, hcalls, copying data between guest
and host, interrupts and page faults.
These don't stress KVM so much as being useful when developing support
for powerpc.
Acked-by: Michael Ellerman (powerpc)
S
Michael is maintaining KVM PPC with the powerpc tree at the moment,
just doesn't necessarily have time to be across all of KVM. But I
think that's okay, from mechanics of how patches flow upstream he is
maintainer. And it probably makes a bit more sense to people who need
to look at the MAINTAINERS
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