On Wed, 15 Jul 2020 14:28:19 -0400 Peter Xu <[email protected]> wrote:
> On Wed, Jul 15, 2020 at 07:45:13PM +0200, Igor Mammedov wrote: > > While testing ACPI cpu hotplug changes I stumbled on BSOD in case > > QEMU is configured with 256 CPUs, Windows Server 2012R2x64 fails to boot > > with bugcheck 5C > > > > > > qemu-system-x86_64 -m 4G -smp 2,sockets=64,cores=4,maxcpus=256 -M > > q35,kernel-irqchip=split -enable-kvm -device > > intel-iommu,intremap=on,eim=on ws2012r2x64DCchk.qcow2 > > > > Looking at stacktrace, it seems that is fails when trying to initialize > > iommu > > > > hal_interrupt_remapping_setup_failure_nt!initbootprocessor > > > > Any idea what to try to figure out what QEMU is missing wrt intremap? > > > > PS: > > WS2016 boots eventually, but CPU hotplug doesn't work, symptoms > > (unconfirmed yet) like SCI isn't being delivered. > > With RHEL76 the same config works fine. > > Igor, > > Could you try this again but with vtd tracepoints enabled? > > -trace enable="vtd_*" > > I think we don't need to capture all the trace outputs, but only until when > the > HAL error message triggered should work. here is all it outputs. [email protected]:vtd_context_cache_reset [email protected]:vtd_switch_address_space Device 00:00.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:01.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:02.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.2 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.3 switching address space (iommu enabled=0) [email protected]:vtd_context_cache_reset [email protected]:vtd_switch_address_space Device 00:00.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:01.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:02.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.0 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.2 switching address space (iommu enabled=0) [email protected]:vtd_switch_address_space Device 00:1f.3 switching address space (iommu enabled=0) > > Thanks, >
