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| author | Alexander Popov <alex.popov@linux.com> | 2019-01-21 15:48:40 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-06 19:43:04 +0100 |
| commit | 43473a6f6734e83ff5d458bedfe2e88b51d161e9 (patch) | |
| tree | df5a879d6ef49b28e243eac3b32d94f1140cefd9 /tools/perf/scripts/python | |
| parent | 74d609f091fee1af788f5e47f9e761364b1fad54 (diff) | |
KVM: x86: Fix single-step debugging
commit 5cc244a20b86090c087073c124284381cdf47234 upstream.
The single-step debugging of KVM guests on x86 is broken: if we run
gdb 'stepi' command at the breakpoint when the guest interrupts are
enabled, RIP always jumps to native_apic_mem_write(). Then other
nasty effects follow.
Long investigation showed that on Jun 7, 2017 the
commit c8401dda2f0a00cd25c0 ("KVM: x86: fix singlestepping over syscall")
introduced the kvm_run.debug corruption: kvm_vcpu_do_singlestep() can
be called without X86_EFLAGS_TF set.
Let's fix it. Please consider that for -stable.
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Cc: stable@vger.kernel.org
Fixes: c8401dda2f0a00cd25c0 ("KVM: x86: fix singlestepping over syscall")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions