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| author | Radim Krčmář <rkrcmar@redhat.com> | 2017-04-05 16:27:47 +0200 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2017-04-05 16:27:47 +0200 |
| commit | 6fd6410311d618d80748b0a5dd3e8d6cd17662bc (patch) | |
| tree | 5bc09692135e712549f8184f35bc5501b3bd2f7f /Documentation | |
| parent | 1fb883bb827ee8efc1cc9ea0154f953f8a219d38 (diff) | |
| parent | 6d56111c92d247bb64301029fe88365aa4caf16e (diff) | |
| download | lwn-6fd6410311d618d80748b0a5dd3e8d6cd17662bc.tar.gz lwn-6fd6410311d618d80748b0a5dd3e8d6cd17662bc.zip | |
Merge tag 'kvm-arm-for-v4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm
From: Christoffer Dall <cdall@linaro.org>
KVM/ARM Fixes for v4.11-rc6
Fixes include:
- Fix a problem with GICv3 userspace save/restore
- Clarify GICv2 userspace save/restore ABI
- Be more careful in clearing GIC LRs
- Add missing synchronization primitive to our MMU handling code
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virtual/kvm/devices/arm-vgic.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt index 76e61c883347..b2f60ca8b60c 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic.txt @@ -83,6 +83,12 @@ Groups: Bits for undefined preemption levels are RAZ/WI. + For historical reasons and to provide ABI compatibility with userspace we + export the GICC_PMR register in the format of the GICH_VMCR.VMPriMask + field in the lower 5 bits of a word, meaning that userspace must always + use the lower 5 bits to communicate with the KVM device and must shift the + value left by 3 places to obtain the actual priority mask level. + Limitations: - Priorities are not implemented, and registers are RAZ/WI - Currently only implemented for KVM_DEV_TYPE_ARM_VGIC_V2. |