Date: Tue, 9 Feb 2010 13:52:24 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-stable@freebsd.org Cc: Tom McLaughlin <tmclaugh@sdf.lonestar.org>, kib@freebsd.org Subject: Re: Recent MFC to 7 causes crash on VMware ESXi Message-ID: <201002091352.24131.jhb@freebsd.org> In-Reply-To: <201002080949.00877.jhb@freebsd.org> References: <4B6B89E7.8030002@sdf.lonestar.org> <4B6DE364.8030509@sdf.lonestar.org> <201002080949.00877.jhb@freebsd.org>
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On Monday 08 February 2010 9:49:00 am John Baldwin wrote:
> On Saturday 06 February 2010 4:47:16 pm Tom McLaughlin wrote:
> > John Baldwin wrote, On 02/05/2010 08:27 AM:
> > > On Thursday 04 February 2010 10:00:55 pm Tom McLaughlin wrote:
> > >> Hi all, a recent MFC to 7-STABLE has started to cause issues for my VMs
> > >> on VMware ESXi 3.5u4. After loading the mpt driver for the LSI disk
> > >> controller the VM just shuts off. The workaround is to change the disk
> > >> controller to the BusLogic type. Still, it used to work up until last
> > >> week. The change was made around January 26th and based on the commits
> > >> that day I'm guessing it's either r203047 or r203073
> > >>
> > >> I have the same issue with both amd64 and i386 VMs. This affects HEAD
> > >> and 8-STABLE as well and first affected HEAD over the summer. (I just
> > >> worked around it and went about my business at the time. :-/) I've
> > >> attached a dmesg from a kernel before the problem and one from after it
> > >> started.
> > >
> > > What if you set 'hw.clfush_disable=1' from the loader?
> > >
> >
> > Yes, that corrected it on all my VMs. I've talked to people on ESXi 4
> > and they do not see the problem. I have yet to try 3.5u5 to see if this
> > is a non-issue. 3.5 will be supported for awhile longer from VMware.
> > I'm going to try upgrading the box during the week.
>
> I believe folks had to do this on HEAD/8.x as well. Perhaps we can
> automatically disable clflush if we are executing under VMware or Xen:
Tom, were you able to verify that this patch fixes the problem for you
without requiring you to set the hw.clflush_disable tunable?
> Index: amd64/amd64/initcpu.c
> ===================================================================
> --- amd64/amd64/initcpu.c (revision 203430)
> +++ amd64/amd64/initcpu.c (working copy)
> @@ -177,17 +177,16 @@
> if ((cpu_feature & CPUID_CLFSH) != 0)
> cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8;
> /*
> - * XXXKIB: (temporary) hack to work around traps generated when
> - * CLFLUSHing APIC registers window.
> + * XXXKIB: (temporary) hack to work around traps generated
> + * when CLFLUSHing APIC registers window under virtualization
> + * environments.
> */
> TUNABLE_INT_FETCH("hw.clflush_disable", &hw_clflush_disable);
> - if (cpu_vendor_id == CPU_VENDOR_INTEL && !(cpu_feature & CPUID_SS) &&
> - hw_clflush_disable == -1)
> + if (vm_guest != 0 /* VM_GUEST_NO */ && hw_clflush_disable == -1)
> cpu_feature &= ~CPUID_CLFSH;
> /*
> * Allow to disable CLFLUSH feature manually by
> - * hw.clflush_disable tunable. This may help Xen guest on some AMD
> - * CPUs.
> + * hw.clflush_disable tunable.
> */
> if (hw_clflush_disable == 1)
> cpu_feature &= ~CPUID_CLFSH;
> Index: i386/i386/initcpu.c
> ===================================================================
> --- i386/i386/initcpu.c (revision 203430)
> +++ i386/i386/initcpu.c (working copy)
> @@ -724,17 +724,16 @@
> if ((cpu_feature & CPUID_CLFSH) != 0)
> cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8;
> /*
> - * XXXKIB: (temporary) hack to work around traps generated when
> - * CLFLUSHing APIC registers window.
> + * XXXKIB: (temporary) hack to work around traps generated
> + * when CLFLUSHing APIC registers window under virtualization
> + * environments.
> */
> TUNABLE_INT_FETCH("hw.clflush_disable", &hw_clflush_disable);
> - if (cpu_vendor_id == CPU_VENDOR_INTEL && !(cpu_feature & CPUID_SS) &&
> - hw_clflush_disable == -1)
> + if (vm_guest != 0 /* VM_GUEST_NO */ && hw_clflush_disable == -1)
> cpu_feature &= ~CPUID_CLFSH;
> /*
> * Allow to disable CLFLUSH feature manually by
> - * hw.clflush_disable tunable. This may help Xen guest on some AMD
> - * CPUs.
> + * hw.clflush_disable tunable.
> */
> if (hw_clflush_disable == 1)
> cpu_feature &= ~CPUID_CLFSH;
>
> --
> John Baldwin
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>
--
John Baldwin
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