On 2015-11-10 13:22, Paolo Bonzini wrote: > Yes, these can happen. The issue is that benign exceptions are > delivered serially, but two of them (#DB and #AC) can also happen > during exception delivery itself. The subsequent infinite stream > of exceptions causes the processor to never exit guest mode. > > Paolo > > Eric Northup (1): > KVM: x86: work around infinite loop in microcode when #AC is delivered > > Paolo Bonzini (2): > KVM: svm: unconditionally intercept #DB > KVM: x86: rename update_db_bp_intercept to update_bp_intercept > > arch/x86/include/asm/kvm_host.h | 2 +- > arch/x86/include/uapi/asm/svm.h | 1 + > arch/x86/kvm/svm.c | 22 +++++++++++----------- > arch/x86/kvm/vmx.c | 7 +++++-- > arch/x86/kvm/x86.c | 2 +- > 5 files changed, 19 insertions(+), 15 deletions(-) > So this affects both Intel and AMD CPUs equally? Nice cross-vendor "compatibility". And it can only be triggered via #AC and #DB, or also other exceptions (that KVM already happens to intercept)? You may guess why I'm asking... Is any of the issues already documented in a vendor errata? Thanks, Jan -- Siemens AG, Corporate Technology, CT RTC ITP SES-DE Corporate Competence Center Embedded Linux -- 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
