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(-)
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2.13.5