On 2015.09.02 at 17:17 +0800, Xiao Guangrong wrote: > > > > No. PAT is of course enabled and booting is successful sometimes even > > with the BUG() in allback_mtrr_type(). I suspect a setup (timing) issue. > > Thanks for your confirmation. > > > > > markus@x4 linux % cat .config | grep X86_PAT > > CONFIG_X86_PAT=y > > markus@x4 linux % dmesg | grep PAT > > [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT > > Strange, BP processor has already set WC to PAT1, however KVM does not read it out > from PAT MSR on its local CPU. > > Hmm... PAT default values do not include WC, it seems initing PAT on SP has not > finished after module_init()? > > Could please apply this diff and test it again? (Your patch was malformed.) [ 2.138098] kvm: Nested Virtualization enabled [ 2.138153] kvm: Nested Paging enabled [ 2.138204] KVM PAT: 0x7040600070406. [ 2.138255] mtrr2protval[0]:18. [ 2.138306] mtrr2protval[1]:ff. [ 2.138356] mtrr2protval[2]:0. [ 2.138408] mtrr2protval[3]:0. [ 2.138459] mtrr2protval[4]:8. [ 2.138510] mtrr2protval[5]:ff. [ 2.138561] mtrr2protval[6]:0. [ 2.138612] mtrr2protval[7]:10. [ 2.138662] BUG in fallback_mtrr_type, mtrr = 1. -- Markus -- 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
