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Date: Thu, 24 Jan 2019 11:41:22 +0300
From: Alexander Popov <>
To: Paolo Bonzini <>, Radim Krcmar <>,
 Thomas Gleixner <>, Ingo Molnar <>,
 Borislav Petkov <>, Nadav Amit <>,
 Andy Lutomirski <>, Stefan Hajnoczi <>,
 H Peter Anvin <>,,,,
Cc: Greg KH <>
Subject: Re: [PATCH v2] KVM: x86: Fix single-step debugging

On 21.01.2019 15:48, Alexander Popov wrote:
> 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.

Hello everyone!

Just a friendly ping about this fix.
Looking forward to the feedback.

Best regards,

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