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| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2013-10-07 17:11:48 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-01-30 13:11:02 +0100 |
| commit | 3c038e6be0e299d4d3762d0a9a29f02de6e04991 (patch) | |
| tree | 06f0c3a8debccb32b2388d57990aba5f4e363ea3 /Documentation/virtual | |
| parent | 9f2ceda49c6b8827c795731c204f6c2587886e2c (diff) | |
| download | linux-3c038e6be0e299d4d3762d0a9a29f02de6e04991.tar.gz linux-3c038e6be0e299d4d3762d0a9a29f02de6e04991.tar.bz2 linux-3c038e6be0e299d4d3762d0a9a29f02de6e04991.zip | |
KVM: async_pf: Async page fault support on s390
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>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/devices/s390_flic.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index 6b557953066a..410fa673e5b6 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -11,6 +11,7 @@ FLIC provides support to - add interrupts (KVM_DEV_FLIC_ENQUEUE) - inspect currently pending interrupts (KVM_FLIC_GET_ALL_IRQS) - purge all pending floating interrupts (KVM_DEV_FLIC_CLEAR_IRQS) +- enable/disable for the guest transparent async page faults Groups: KVM_DEV_FLIC_ENQUEUE @@ -34,3 +35,12 @@ Groups: KVM_DEV_FLIC_CLEAR_IRQS Simply deletes all elements from the list of currently pending floating interrupts. No interrupts are injected into the guest. + + KVM_DEV_FLIC_APF_ENABLE + Enables async page faults for the guest. So in case of a major page fault + the host is allowed to handle this async and continues the guest. + + KVM_DEV_FLIC_APF_DISABLE_WAIT + Disables async page faults for the guest and waits until already pending + async page faults are done. This is necessary to trigger a completion interrupt + for every init interrupt before migrating the interrupt list. |