Dear FreeBSD Developers: I used the ZFS Guru LiveCD to install FreeBSD 9 in KVM on a host system with an AMD Thuban processor (K10h). I then proceeded to compile perl and the VM crashed. Linux's dmesg gave me the following hint as to the cause:
[ 3568.234654] KVM: Guest triggered AMD Erratum 383 I also tried installing Gentoo Prefix, a userland package manager like NetBSD pkgsrc, and the VM also crashed with the same message when compiling the first component. AMD has documented this issue, with a workaround for hypervisors and a statement saying that they won't fix it: "If system software performs uncommon methods to change the page size of an active page table that is valid, the CPU core may, under a highly specific and detailed set of conditions, form duplicate TLB entries for a single linear address. The CPU core will machine check if this page is then accessed prior to it being invalidated from the TLB." http://support.amd.com/us/Embedded_TechDocs/41322.pdf Has anyone done anything to workaround this issue? I have a Gentoo Hardened VM running on this machine which has no problem compiling software, so I am sure that some sort of page table workaround is possible. Yours truly, Richard Yao
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