Devices that use ISA IRQs expect them to be already configured, and don't
call bus_config_intr, which prevents those IRQs from working on Xen. In
order to solve it pre-register all the legacy IRQs with the default values
(edge triggered, low polarity) if no override is found.
While there add a panic if the registration of an interrupt override fails.
Sponsored by: Citrix Systems R&D
If the SCI is remapped to a non-ISA global interrupt notify the ACPI
subsystem about the override.
Reported by: David P. Discher <dpd@dpdtech.com>
Sponsored by: Citrix Systems R&D
Allow a privileged Xen guest (Dom0) to parse the MADT ACPI interrupt
overrides and register them with the interrupt subsystem.
Also add a Xen specific implementation for bus_config_intr that
registers interrupts on demand for all the vectors less than
FIRST_MSI_INT.
Sponsored by: Citrix Systems R&D
x86/xen/pvcpu_enum.c:
- Use helper functions from x86/acpica/madt.c in order to parse
interrupt overrides from the MADT.
- Walk the MADT and register any interrupt override with the
interrupt subsystem.
x86/xen/xen_nexus.c:
- Add a custom bus_config_intr method for Xen that intercepts calls
to configure unset interrupts and registers them on the fly (if the
vector is < FIRST_MSI_INT).
Lower the quality of the MADT ACPI enumerator, so on Xen Dom0 we can
force the usage of the Xen mptable enumerator even when ACPI is
detected.
This is needed because Xen might restrict the number of vCPUs
available to Dom0, but the MADT ACPI table parsed in FreeBSD is the
native one (which enumerates all the CPUs available in the system).
Sponsored by: Citrix Systems R&D
Reviewed by: gibbs
x86/acpica/madt.c:
- Lower MADT enumerator quality to -50.
x86/xen/pvcpu_enum.c:
- Rise Xen PV enumerator to 0.
On PVH there's no ACPI, so the CPU enumeration must be implemented
using Xen hypercalls.
Approved by: gibbs
Sponsored by: Citrix Systems R&D
x86/xen/pvcpu_enum.c:
- Enumerate avaiable vCPUs on PVH by using the VCPUOP_is_up
hypercall.
- Set vcpu_id for PVH guests.
conf/files.amd64:
- Include the PV CPU enumerator in the XENHVM build.
