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Re: [Qemu-devel] [PATCH 0/7] target-ppc: endian fixes for KVM and gdbstu
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] [PATCH 0/7] target-ppc: endian fixes for KVM and gdbstub |
Date: |
Mon, 4 Jan 2016 10:17:21 +0100 |
On Fri, 18 Dec 2015 11:18:16 +0100
Greg Kurz <address@hidden> wrote:
> Hi,
>
> This series is a sequel to Anton's tentative at bringing VSX support in
> our gdbstub:
>
> http://patchwork.ozlabs.org/patch/453758/
>
> Indeed, FP, SPE and Altivec registers need to be copied to memory with
> the appropriate ordering, like we already do for core registers. This
> series reuses the maybe_bswap_register() helper to do the job, since
> it already handles the user mode case where the target endianness is
> known at build time and don't need byteswap. This is covered by
> patches 2 to 6.
>
> I also found more serious issues that probably break more than gdbstub.
>
> First one is a bug in KVM, that completely breaks the KVM_GET_ONE_REG
> and KVM_SET_ONE_REG ioctls for Altivec registers. I've already sent a
> patch:
>
> http://patchwork.ozlabs.org/patch/557568/
>
> Second one is a bug in QEMU that breaks synchronisation with KVM for FP,
> Altivec and VSX registers on little-endian hosts. I pushed the fix to
> patch 1 since it is needed for the gdbstub fixes to actually work, but it
> could even be handled separately.
>
> And finally, patch 7 is Anton's + the byteswapping for little-endian
> guests.
> Happy new year !
> Cheers.
>
Ping ?
> ---
>
> Anton Blanchard (1):
> target-ppc: gdbstub: Add VSX support
>
> Greg Kurz (6):
> target-ppc: kvm: fix floating point registers sync on little-endian
> hosts
> target-ppc: rename and export maybe_bswap_register()
> target-ppc: gdbstub: fix float registers for little-endian guests
> target-ppc: gdbstub: introduce avr_need_swap()
> target-ppc: gdbstub: fix altivec registers for little-endian guests
> target-ppc: gdbstub: fix spe registers for little-endian guests
>
>
> configure | 6 ++-
> gdb-xml/power-vsx.xml | 44 +++++++++++++++++++++++
> target-ppc/cpu.h | 1 +
> target-ppc/gdbstub.c | 10 +++--
> target-ppc/kvm.c | 12 ++++++
> target-ppc/translate_init.c | 84
> +++++++++++++++++++++++++++++++++++--------
> 6 files changed, 134 insertions(+), 23 deletions(-)
> create mode 100644 gdb-xml/power-vsx.xml
>
>
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