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e7e2431586
Xen PVH guests expose a very minimal set of ACPI tables, and due to the lack of SCI interrupt FreeBSD doesn't allocate the suspend stacks for saving CPU and FPU contexts. Lack of allocated stacks would lead to a page-fault in cpususpend_handler() when CPUs attempted to use the save context area as a result of a Xen suspend request. However there's no need to save the CPU or the FPU registers in the Xen case, as that's all handled by the hypervisor. Hence avoid saving all this state if the suspend stacks are not allocated. Note that this will currently only apply to PVH guests, HVM ones will still get the stack allocated and the context saved even when not strictly required. I find it easier rather that having to provide cpususpend_handler() with extra information whether the context needs to be saved or not. Sponsored by: Cloud Software Group Reviewed by: markj Differential revision: https://reviews.freebsd.org/D43765 |
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| .. | ||
| acpica | ||
| bios | ||
| conf | ||
| cpufreq | ||
| include | ||
| iommu | ||
| isa | ||
| linux | ||
| pci | ||
| x86 | ||
| xen | ||