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KVM: PPC: Book3S HV: XIVE: Add a global reset control

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This control is to be used by the H_INT_RESET hcall from QEMU. Its
purpose is to clear all configuration of the sources and EQs. This is
necessary in case of a kexec (for a kdump kernel for instance) to make
sure that no remaining configuration is left from the previous boot
setup so that the new kernel can start safely from a clean state.

The queue 7 is ignored when the XIVE device is configured to run in
single escalation mode. Prio 7 is used by escalations.

The XIVE VP is kept enabled as the vCPU is still active and connected
to the XIVE device.

Signed-off-by: Cédric Le Goater <[email protected]>
Reviewed-by: David Gibson <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
This commit is contained in:
Cédric Le Goater 2019-04-18 12:39:32 +02:00 • committed by Paul Mackerras
commit 5ca8064748
3 changed files with 91 additions and 0 deletions
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5
Documentation/virtual/kvm/devices/xive.txt
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@ -17,6 +17,11 @@ the legacy interrupt mode, referred as XICS (POWER7/8).
1. KVM_DEV_XIVE_GRP_CTRL
Provides global controls on the device
Attributes:
1.1 KVM_DEV_XIVE_RESET (write only)
Resets the interrupt controller configuration for sources and event
queues. To be used by kexec and kdump.
Errors: none
2. KVM_DEV_XIVE_GRP_SOURCE (write only)
Initializes a new source in the XIVE device and mask it.