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Re: [Qemu-devel] [PATCH v1 0/2] s390x/tcg: LAP support using immediate T
From: |
Cornelia Huck |
Subject: |
Re: [Qemu-devel] [PATCH v1 0/2] s390x/tcg: LAP support using immediate TLB invalidation |
Date: |
Fri, 20 Oct 2017 10:25:25 +0200 |
On Tue, 17 Oct 2017 14:17:06 +0200
Cornelia Huck <address@hidden> wrote:
> On Mon, 16 Oct 2017 22:23:56 +0200
> David Hildenbrand <address@hidden> wrote:
>
> > Details about Low-Address Protection can be found in description of
> > patch 1 and 2. It is basically a subpage protection of the first two
> > pages of every address space (for which it is enabled).
> >
> > We can achieve this by simply directly invalidating the TLB entry and
> > therefore forcing every write accesses onto these two pages into the slow
> > path.
> >
> > With this patch, I can boot Linux just fine (which uses LAP). This also
> > makes all related kvm-unit-tests that we have pass.
> >
> >
> > RFC -> v1:
> > - fix LAP range check (Thomas)
> > - SIGP fix got picked up
> >
> > Based on: https://github.com/cohuck/qemu.git s390-next
> > Available on: https://github.com/dhildenb/qemu.git s390x_lap
> >
> >
> > David Hildenbrand (2):
> > accel/tcg: allow to invalidate a write TLB entry immediately
> > s390x/tcg: low-address protection support
> >
> > accel/tcg/cputlb.c | 5 ++-
> > accel/tcg/softmmu_template.h | 4 +-
> > include/exec/cpu-all.h | 3 ++
> > target/s390x/excp_helper.c | 3 +-
> > target/s390x/mem_helper.c | 8 ----
> > target/s390x/mmu_helper.c | 94
> > +++++++++++++++++++++++++++-----------------
> > 6 files changed, 69 insertions(+), 48 deletions(-)
> >
>
> As the oom was not reproducible (and seems to be only a problem of the
> machine being run with barely enough memory), I'm inclined to queue
> this to s390-next after I got some acks/r-bs for patch 1.
And as I want to send this in my last pull req before softfreeze, I
included it anyway :)
Thanks, applied.
- [Qemu-devel] [PATCH v1 1/2] accel/tcg: allow to invalidate a write TLB entry immediately, (continued)
Re: [Qemu-devel] [PATCH v1 0/2] s390x/tcg: LAP support using immediate TLB invalidation, Cornelia Huck, 2017/10/17
Re: [Qemu-devel] [PATCH v1 0/2] s390x/tcg: LAP support using immediate TLB invalidation, Cornelia Huck, 2017/10/17
- Re: [Qemu-devel] [PATCH v1 0/2] s390x/tcg: LAP support using immediate TLB invalidation,
Cornelia Huck <=