From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: thuth@redhat.com, cohuck@redhat.com,
Christian Borntraeger <borntraeger@de.ibm.com>,
Alexander Graf <agraf@suse.de>,
Richard Henderson <rth@twiddle.net>
Subject: [Qemu-devel] [PATCH v1 0/6] s390x/tcg: fix some accesses using low address
Date: Tue, 26 Sep 2017 20:33:12 +0200 [thread overview]
Message-ID: <20170926183318.12995-1-david@redhat.com> (raw)
Conny reported that a guest Linux currently spits out:
"The s390-virtio transport is deprecated. Please switch to a modern host
providing virtio-ccw."
This is strange, because we have no legacy virtio transport in QEMU :)
Main problem is, that a page is tested for acccess, and the test does not
fail. All memory access variants like stb_phys() will never fail. On
invalid memory, they simply do nothing.
Linux uses lura for this check. Let's introduce a _real MMU that handles
prefixing and can later be used for things like low address protection.
The other BUG is that a check for invalid memory is wrong. Therefore,
Patch 1 alone makes the guest crash when trying to initialize the
virtio transport. Crazy stuff.
David Hildenbrand (6):
s390x/tcg: fix checking for invalid memory check
s390x/tcg: add MMU for real addresses
s390x/tcg: make lura(g) use the new _real mmu.
s390x/tcg: make stora(g) use the new _real mmu
s390x/tcg: make testblock use the new _real mmu
s390x/tcg: make idte/ipte use the new _real mmu
target/s390x/cpu.h | 4 +++-
target/s390x/excp_helper.c | 29 +++++++++++++++++++----------
target/s390x/internal.h | 2 ++
target/s390x/mem_helper.c | 36 +++++++++++-------------------------
target/s390x/mmu_helper.c | 19 +++++++++++++++++++
target/s390x/translate.c | 4 ----
6 files changed, 54 insertions(+), 40 deletions(-)
--
2.13.5
next reply other threads:[~2017-09-26 18:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-26 18:33 David Hildenbrand [this message]
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 1/6] s390x/tcg: fix checking for invalid memory check David Hildenbrand
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 2/6] s390x/tcg: add MMU for real addresses David Hildenbrand
2017-09-27 12:20 ` David Hildenbrand
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 3/6] s390x/tcg: make lura(g) use the new _real mmu David Hildenbrand
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 4/6] s390x/tcg: make stora(g) " David Hildenbrand
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 5/6] s390x/tcg: make testblock " David Hildenbrand
2017-09-26 18:33 ` [Qemu-devel] [PATCH v1 6/6] s390x/tcg: make idte/ipte " David Hildenbrand
2017-09-26 23:10 ` [Qemu-devel] [PATCH v1 0/6] s390x/tcg: fix some accesses using low address Richard Henderson
2017-09-27 7:38 ` Thomas Huth
2017-09-27 11:49 ` Cornelia Huck
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