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Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests

From "Gabriel L. Somlo" <gsomlo@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests
Date 2017-03-16 21:20 +0100
Message-ID <tlK2m-3uf-11@gated-at.bofh.it> (permalink)
References (5 earlier) <tlHnR-1ze-37@gated-at.bofh.it> <tlHHd-1ID-37@gated-at.bofh.it> <tlItA-2iT-11@gated-at.bofh.it> <tlJfY-2Un-21@gated-at.bofh.it> <tlJfY-2Un-19@gated-at.bofh.it>
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On Thu, Mar 16, 2017 at 09:27:56PM +0200, Michael S. Tsirkin wrote:
> On Thu, Mar 16, 2017 at 03:24:41PM -0400, Gabriel L. Somlo wrote:
> > On Thu, Mar 16, 2017 at 08:29:32PM +0200, Michael S. Tsirkin wrote:
> > > Let's take a step back and try to figure out how is
> > > mwait called. How about dumping code of VCPUs
> > > around mwait?  gdb disa command will do this.
> > 
> > Started guest with '-s', tried to attach from gdb with
> > "target remote localhost:1234", got
> > "remote 'g' packet reply is too long: <lengthy string of numbers>"
> 
> Try
> 
> set arch x86-64:x86-64

'set architecture i386:x86-64:intel' is what worked for me;

Been rooting around for a while, can't find mwait or monitor :(

Guess I'll have to recompile KVM to actually issue an invalid opcode,
so OS X will print a panic message with the exact address :)

Stay tuned...
 
> 
> > Tried typing 'cont' in the qemu monitor, got os x to crash:
> > 
> > panic (cpu 1 caller 0xffffff7f813ff488): pmLock: waited too long, held
> > by 0xffffff7f813eff65
> > 
> > Hmm, maybe that's where it keeps its monitor/mwait idle loop.
> > Restarted the guest, tried this from monitor:
> > 
> > 	dump-guest-memory foobar 0xffffff7f813e0000 0x20000
> > 
> > Got "'dump-guest-memory' has failed: integer is for 32-bit values"
> > 
> > Hmmm... I have no idea what I'm doing anymore at this point... :)
> > 
> > --G
> 
> I think 0xffffff7f813ff488 is a PC.
> 
> -- 
> MST

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[PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-15 22:30 +0100
  Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 00:40 +0100
    Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 00:50 +0100
      Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 14:30 +0100
        Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 15:10 +0100
          Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 17:00 +0100
            Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 17:00 +0100
              Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 17:30 +0100
        Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 15:10 +0100
          Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 16:00 +0100
            Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 16:30 +0100
            Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 16:40 +0100
              Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 17:10 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 17:50 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 18:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 18:50 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 19:40 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 20:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 21:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 22:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-17 03:10 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-17 14:40 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-21 04:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-21 18:10 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Nadav Amit <nadav.amit@gmail.com> - 2017-03-21 18:40 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-21 20:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Gabriel Somlo <gsomlo@gmail.com> - 2017-03-22 00:00 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Nadav Amit <nadav.amit@gmail.com> - 2017-03-22 01:10 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-22 14:40 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-22 15:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-22 15:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 20:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 18:30 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 18:40 +0100
              Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 17:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 17:50 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 18:00 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Gabriel L. Somlo" <gsomlo@gmail.com> - 2017-03-16 18:00 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-16 18:20 +0100
                Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Radim Krčmář <rkrcmar@redhat.com> - 2017-03-16 18:40 +0100
  Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Joerg Roedel <joro@8bytes.org> - 2017-03-21 17:20 +0100
    Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-21 19:50 +0100
  Re: [PATCH v5 untested] kvm: better MWAIT emulation for guests Alexander Graf <agraf@suse.de> - 2017-03-27 15:40 +0200

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