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v0.5.1
https://github.com/torvalds/linux
Revision 204c91eff798a78498cc7cbf1bc76892badfa96d authored by Paolo Bonzini on 20 May 2019, 11:31:02 UTC, committed by Paolo Bonzini on 24 May 2019, 19:27:10 UTC
The guest_code of sync_regs_test is assuming that the compiler will not
touch %r11 outside the asm that increments it, which is a bit brittle.
Instead, we can increment a variable and use a dummy asm to ensure the
increment is not optimized away.  However, we also need to use a
callee-save register or the compiler will insert a save/restore around
the vmexit, breaking the whole idea behind the test.

(Yes, "if it ain't broken...", but I would like the test to be clean
before it is copied into the upcoming s390 selftests).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 12e9612
History
Tip revision: 204c91eff798a78498cc7cbf1bc76892badfa96d authored by Paolo Bonzini on 20 May 2019, 11:31:02 UTC
KVM: selftests: do not blindly clobber registers in guest asm
Tip revision: 204c91e
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