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KVM: async_pf: Async page fault support on s390

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This patch enables async page faults for s390 kvm guests.
It provides the userspace API to enable and disable_wait this feature.
The disable_wait will enforce that the feature is off by waiting on it.
Also it includes the diagnose code, called by the guest to enable async page faults.

The async page faults will use an already existing guest interface for this
purpose, as described in "CP Programming Services (SC24-6084)".

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Dominik Dingel
2013-10-07 17:11:48 +02:00
committed by Christian Borntraeger
parent 9f2ceda49c
commit 3c038e6be0
12 changed files with 326 additions and 9 deletions
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2
arch/s390/include/uapi/asm/kvm.h
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@@ -20,6 +20,8 @@
#define KVM_DEV_FLIC_GET_ALL_IRQS 1
#define KVM_DEV_FLIC_ENQUEUE 2
#define KVM_DEV_FLIC_CLEAR_IRQS 3
#define KVM_DEV_FLIC_APF_ENABLE 4
#define KVM_DEV_FLIC_APF_DISABLE_WAIT 5
/*
* We can have up to 4*64k pending subchannels + 8 adapter interrupts,
* as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts.