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| author | Vitaly Kuznetsov <[email protected]> | 2024-09-20 15:44:22 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2024-10-20 16:10:27 +0000 |
| commit | 9a400068a1586bc4f10ee8b0443527de27d8834c (patch) | |
| tree | c5bda3c08283a5786f48b7fc7092aef58e6e98ab /drivers/fpga | |
| parent | KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory (diff) | |
| download | kernel-9a400068a1586bc4f10ee8b0443527de27d8834c.tar.gz kernel-9a400068a1586bc4f10ee8b0443527de27d8834c.zip | |
KVM: selftests: x86: Avoid using SSE/AVX instructions
Some distros switched gcc to '-march=x86-64-v3' by default and while it's
hard to find a CPU which doesn't support it today, many KVM selftests fail
with
==== Test Assertion Failure ====
lib/x86_64/processor.c:570: Unhandled exception in guest
pid=72747 tid=72747 errno=4 - Interrupted system call
Unhandled exception '0x6' at guest RIP '0x4104f7'
The failure is easy to reproduce elsewhere with
$ make clean && CFLAGS='-march=x86-64-v3' make -j && ./x86_64/kvm_pv_test
The root cause of the problem seems to be that with '-march=x86-64-v3' GCC
uses AVX* instructions (VMOVQ in the example above) and without prior
XSETBV() in the guest this results in #UD. It is certainly possible to add
it there, e.g. the following saves the day as well:
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'drivers/fpga')
0 files changed, 0 insertions, 0 deletions