path: root/arch/x86/entry/entry_64.S
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authorAndy Lutomirski <luto@kernel.org>2019-07-01 20:43:19 -0700
committerThomas Gleixner <tglx@linutronix.de>2019-07-02 08:45:20 +0200
commit9402eaf4c11f0b892eda7b2bcb4654ab34ce34f9 (patch)
tree5b392bddeac59062107c2e2adacaf80fc514bc66 /arch/x86/entry/entry_64.S
parentfd329f276ecaad7a371d6f91b9bbea031d0c3440 (diff)
selftests/x86: Test SYSCALL and SYSENTER manually with TF set
Make sure that both variants of the nasty TF-in-compat-syscall are exercised regardless of what vendor's CPU is running the tests. Also change the intentional signal after SYSCALL to use ud2, which is a lot more comprehensible. This crashes the kernel due to an FSGSBASE bug right now. This test *also* detects a bug in KVM when run on an Intel host. KVM people, feel free to use it to help debug. There's a bunch of code in this test to warn instead of going into an infinite looping when the bug gets triggered. Reported-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: "BaeChang Seok" <chang.seok.bae@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: kvm@vger.kernel.org Cc: "Bae, Chang Seok" <chang.seok.bae@intel.com> Link: https://lkml.kernel.org/r/5f5de10441ab2e3005538b4c33be9b1965d1bb63.1562035429.git.luto@kernel.org
Diffstat (limited to 'arch/x86/entry/entry_64.S')
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