Dustin Kirkland <kirkland@xxxxxxxxxxxxx> writes: > On Thu, Jan 22, 2009 at 5:24 PM, Gioacchino Mendola > <gioacchino.mendola@xxxxxxxxx> wrote: >> but I have some problems, >> since guest freezes at boot time >> (at very early stage since it does not print any message on the attached vnc) >> and /var/log/messages sports the following error message: >> >> kvm: 4982: cpu0 unhandled wrmsr: 0xc0010117 data 0 > > We're seeing this same error in Ubuntu's kvm-83 as well, > * https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/325851 > > It seems benign, on this side. No lockups here, that I'm noticing. > > What does this error message mean? Is it something that we should be > concerned about? After some spelunking, it turns out this MSR is defined by AMD's SVM facility. Here's what the manual says: E.4 VM_HSAVE_PA MSR (C001_0117h) The 64-bit read/write VM_SAVE_PA MSR holds the physical address of a block of memory where VMRUN saves host state, and from which #VMEXIT reloads host state. The VMM software is expected to set up this register before issuing the first VMRUN instruction. The host state-save area must be aligned at 4KB; software must not attempt to either read or write it. Writing this MSR causes a #GP if: * any of the low 12 bits of the address written are nonzero, or * the address written is greater than or equal to the maximum supported physical address for this implementation. I've seen the message with both Linux and Windows XP guests. Strange. -- Paul Collins Wellington, New Zealand Dag vijandelijk luchtschip de huismeester is dood -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
