On 08/31/2010 07:33 PM, Jes Sorensen wrote:
On 08/31/10 18:28, Avi Kivity wrote:
On 08/31/2010 03:17 PM, Jes.Sorensen@xxxxxxxxxx wrote:
From: Jes Sorensen<Jes.Sorensen@xxxxxxxxxx>
We regularly see bug reports over this one, however it is a write to
a read-only register which some operating systems (including Linux)
tend to write to once in a while.
Ignore the writes since they do no harm.
Does Linux write it with wrmsr_safe()? If not, I don't see how it
works. If it does, then we shouldn't ignore the write, instead issue
the #GP as usual, but be silent about it.
To be honest, I am having a hard time determining where the write
happens. I looked at this with Gleb and the rip obtained by
kvm_read_rip(vcpu) in the code doesn't indicate anything that resembles
a wrmsr().
It was either a
560 outb(0xfe, 0x64); /* pulse reset low */
or
49 asm volatile("sti; hlt": : :"memory");
which makes no sense to me,
Just grep for the msr name in a guest kernel source that's known to
trigger the message.
but given it's x86, I am not sure if it
could have come from the BIOS or something during reboot?
The bios is the same for all kernels (and is unlikely to mess with
performance counter msrs anyway).
--
error compiling committee.c: too many arguments to function
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