From: Paul Mackerras <paulus@samba.org>
To: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, Anton Blanchard <anton@samba.org>
Subject: Re: [PATCH] powerpc/kvmbook3s_hv: propagate H_SET_MODE to the host
Date: Thu, 26 Sep 2013 08:31:18 +1000 [thread overview]
Message-ID: <20130925223118.GA2844@iris.ozlabs.ibm.com> (raw)
In-Reply-To: <20130925121027.29504.19269.stgit@nimbus>
On Wed, Sep 25, 2013 at 02:10:27PM +0200, Laurent Dufour wrote:
> Follow-up to Anton's H_SET_MODE patch, the host should be taken aware of
> guest endianess change.
>
> The hcall H_SET_MODE is processed in kvm then in the host.
>
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
> arch/powerpc/kvm/book3s_hv.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 998cad3..4a47c74 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -599,6 +599,14 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
> kvmppc_get_gpr(vcpu, 5),
> kvmppc_get_gpr(vcpu, 6),
> kvmppc_get_gpr(vcpu, 7));
> + /*
> + * If the hcall succeeded, we propagate it to the host.
> + * This way, it will be aware of the endianess's change too.
> + * The assumption is made that the hcall will succeed in the
> + * host.
> + */
> + if (ret == H_SUCCESS)
> + return RESUME_HOST;
> break;
The problem with this is that H_SET_MODE isn't just used for setting
endianness; it also does breakpoint setting (DAWR/X and CIABR), which
might happen very frequently, so we don't want them being punted up to
userspace.
Paul.
next prev parent reply other threads:[~2013-09-25 22:31 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-23 2:04 [PATCH 00/39] Second round of 64bit PowerPC little endian patches Anton Blanchard
2013-09-23 2:04 ` [PATCH 01/39] powerpc: Fix endian issues in VMX copy loops Anton Blanchard
2013-09-23 2:04 ` [PATCH 02/39] powerpc: Book 3S MMU little endian support Anton Blanchard
2013-09-23 2:04 ` [PATCH 03/39] powerpc: Fix offset of FPRs in VSX registers in little endian builds Anton Blanchard
2013-09-23 2:04 ` [PATCH 04/39] powerpc: PTRACE_PEEKUSR/PTRACE_POKEUSER of FPR " Anton Blanchard
2013-09-23 2:04 ` [PATCH 05/39] powerpc: Little endian builds double word swap VSX state during context save/restore Anton Blanchard
2013-09-23 2:04 ` [PATCH 06/39] powerpc: Support endian agnostic MMIO Anton Blanchard
2013-09-23 2:04 ` [PATCH 07/39] powerpc: Add little endian support for word-at-a-time functions Anton Blanchard
2013-09-23 2:04 ` [PATCH 08/39] powerpc: Set MSR_LE bit on little endian builds Anton Blanchard
2013-09-23 2:04 ` [PATCH 09/39] powerpc: Reset MSR_LE on signal entry Anton Blanchard
2013-09-23 2:04 ` [PATCH 10/39] powerpc: Include the appropriate endianness header Anton Blanchard
2013-09-23 2:04 ` [PATCH 11/39] powerpc: endian safe trampoline Anton Blanchard
2013-12-28 7:24 ` Olof Johansson
2013-12-28 7:58 ` Benjamin Herrenschmidt
2013-09-23 2:04 ` [PATCH 12/39] powerpc: Remove open coded byte swap macro in alignment handler Anton Blanchard
2013-09-23 2:04 ` [PATCH 13/39] powerpc: Remove hard coded FP offsets " Anton Blanchard
2013-09-23 2:04 ` [PATCH 14/39] powerpc: Alignment handler shouldn't access VSX registers with TS_FPR Anton Blanchard
2013-09-23 2:04 ` [PATCH 15/39] powerpc: Add little endian support to alignment handler Anton Blanchard
2013-09-23 2:04 ` [PATCH 16/39] powerpc: Handle VSX alignment faults in little endian mode Anton Blanchard
2013-09-23 2:04 ` [PATCH 17/39] powerpc: Use generic checksum code in little endian Anton Blanchard
2013-09-23 2:04 ` [PATCH 18/39] powerpc: Use generic memcpy " Anton Blanchard
2013-09-23 2:04 ` [PATCH 19/39] powerpc: uname should return ppc64le/ppcle on little endian builds Anton Blanchard
2013-09-23 2:04 ` [PATCH 20/39] powerpc: Little endian fixes for platforms/powernv/opal.c Anton Blanchard
2013-09-23 2:04 ` [PATCH 21/39] powerpc: Little endian fix for arch/powerpc/platforms/powernv/pci.c Anton Blanchard
2013-09-23 2:04 ` [PATCH 22/39] powerpc: Little endian fix for arch/powerpc/platforms/powernv/pci-p5ioc2.c Anton Blanchard
2013-09-23 2:04 ` [PATCH 23/39] powerpc: Little endian sparse clean up for arch/powerpc/platforms/powernv/pci-ioda.c Anton Blanchard
2013-09-23 2:04 ` [PATCH 24/39] powerpc/powernv: Fix endian issues in OPAL RTC driver Anton Blanchard
2013-09-23 2:04 ` [PATCH 25/39] powerpc/powernv: Fix endian issues in OPAL ICS backend Anton Blanchard
2013-09-23 2:05 ` [PATCH 26/39] powerpc/powernv: Make OPAL NVRAM device tree accesses endian safe Anton Blanchard
2013-09-23 2:05 ` [PATCH 27/39] powerpc/powernv: Fix endian issues in powernv PCI code Anton Blanchard
2013-09-23 2:05 ` [PATCH 28/39] powerpc/powernv: Fix endian issues in OPAL console and udbg backend Anton Blanchard
2013-09-23 2:05 ` [PATCH 29/39] powerpc/powernv: Fix OPAL entry and exit in little endian mode Anton Blanchard
2013-09-23 2:05 ` [PATCH 30/39] powerpc/powernv: Don't register exception handlers " Anton Blanchard
2013-09-23 2:05 ` [PATCH 31/39] powerpc/powernv: More little endian issues in OPAL RTC driver Anton Blanchard
2013-09-23 2:05 ` [PATCH 32/39] powerpc/powernv: Fix some PCI sparse errors and one LE bug Anton Blanchard
2013-09-23 2:05 ` [PATCH 33/39] powerpc/hvsi: Fix endian issues in HVSI driver Anton Blanchard
2013-09-23 2:05 ` [PATCH 34/39] tty/hvc_opal: powerpc: Make OPAL HVC device tree accesses endian safe Anton Blanchard
2013-09-23 2:05 ` [PATCH 35/39] KVM: PPC: Disable KVM on little endian builds Anton Blanchard
2013-09-23 2:05 ` [PATCH 36/39] powerpc/kvm/book3s_hv: Add little endian guest support Anton Blanchard
2013-09-25 12:10 ` [PATCH] powerpc/kvmbook3s_hv: propagate H_SET_MODE to the host Laurent Dufour
2013-09-25 12:27 ` Greg Kurz
2013-09-25 22:31 ` Paul Mackerras [this message]
2013-09-27 8:14 ` Laurent Dufour
2013-09-27 13:59 ` [PATCH V2] powerpc/kvm/book3s_hv: propagate H_SET_MODE_RESOURCE_LE " Laurent Dufour
2013-09-27 14:45 ` Greg Kurz
2013-10-03 14:29 ` [RFC] QEMU/KVM PowerPC: virtio and guest endianness Greg Kurz
2013-10-04 11:43 ` Alexander Graf
2013-10-04 11:43 ` [Qemu-devel] " Alexander Graf
2013-10-04 13:43 ` [Qemu-ppc] " Greg Kurz
2013-10-04 13:43 ` [Qemu-devel] " Greg Kurz
2013-10-04 11:53 ` Paul Mackerras
2013-10-04 11:54 ` [Qemu-ppc] " Alexander Graf
2013-10-04 14:08 ` Greg Kurz
2013-10-04 14:08 ` [Qemu-devel] " Greg Kurz
2013-10-04 14:19 ` Alexander Graf
2013-10-04 14:19 ` [Qemu-devel] " Alexander Graf
2013-10-07 15:23 ` [Qemu-devel] [PATCH 0/2] virtio: guest endianness support Greg Kurz
2013-10-07 15:23 ` [Qemu-devel] [PATCH 1/2] linux-headers: POWER8 partial update Greg Kurz
2013-10-07 15:23 ` [Qemu-devel] [PATCH 2/2] virtio: refresh registers at reset time Greg Kurz
2013-10-15 1:49 ` Rusty Russell
2013-09-30 18:40 ` [PATCH 36/39] powerpc/kvm/book3s_hv: Add little endian guest support Alexander Graf
2013-09-23 2:05 ` [PATCH 37/39] powerpc: Add ability to build little endian kernels Anton Blanchard
2013-09-23 2:05 ` [PATCH 38/39] powerpc: Don't set HAVE_EFFICIENT_UNALIGNED_ACCESS on little endian builds Anton Blanchard
2013-09-23 2:05 ` [PATCH 39/39] powerpc: Work around little endian gcc bug Anton Blanchard
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