Hyper-V Gen1 guests are getting stuck on boot when 'hv-passthrough' is used. While 'hv-passthrough' is a debug only feature, this significantly limit its usefullness. While debugging the problem, I found that there are two loosely connected issues: - 'hv-passthrough' enables 'hv-syndbg' and this is undesired. - 'hv-syndbg's support by KVM is detected incorrectly when !CONFIG_SYNDBG.
Fix both issues; exclude 'hv-syndbg' from 'hv-passthrough' and don't allow to turn on 'hv-syndbg' for !CONFIG_SYNDBG builds. Vitaly Kuznetsov (2): i386: Fix conditional CONFIG_SYNDBG enablement i386: Exclude 'hv-syndbg' from 'hv-passthrough' docs/system/i386/hyperv.rst | 13 +++++++++---- target/i386/cpu.c | 2 ++ target/i386/kvm/kvm.c | 18 ++++++++++++------ 3 files changed, 23 insertions(+), 10 deletions(-) -- 2.41.0