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s390x/tcg: properly implement the TOD

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Right now, each CPU has its own TOD. Especially, the TOD will differ
based on creation time of a CPU - e.g. when hotplugging a CPU the times
will differ quite a lot, resulting in stall warnings in the guest.

Let's use a single TOD by implementing our new TOD device. Prepare it
for TOD-clock epoch extension.

Most importantly, whenever we set the TOD, we have to update the CKC
timer.

Introduce "tcg_s390x.h" just like "kvm_s390x.h" for tcg specific
function declarations that should not go into cpu.h.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180627134410.4901-6-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-06-27 15:44:06 +02:00 • committed by Cornelia Huck
parent f777b20544
commit 7de3b1cdc6
8 changed files with 109 additions and 34 deletions
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target/s390x/cpu.h
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@ -130,7 +130,6 @@ struct CPUS390XState {
uint64_t cpuid;
#endif
uint64_t tod_offset;
QEMUTimer *tod_timer;
QEMUTimer *cpu_timer;