Il 28/01/2014 17:28, Christoffer Dall ha scritto:
The KVM API documentation is not clear about the semantics of the data
field on the mmio struct on the kvm_run struct.
This has become problematic when supporting ARM guests on big-endian
host systems with guests of both endianness types, because it is unclear
how the data should be exported to user space.
This should not break with existing implementations as all supported
existing implementations of known user space applications (QEMU and
kvmtools for virtio) only support default endianness of the
architectures on the host side.
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Peter Maydell <peter.maydell@xxxxxxxxxx>
Cc: Alexander Graf <agraf@xxxxxxx>
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
---
Changes [v2 - v3]:
- Change the semantics and wordings as per Scott's, Avi's, and Ben's
suggestions.
Changes [v1 - v2]:
- s/host kernel should/host user space should/
Documentation/virtual/kvm/api.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 366bf4b..e11f09d 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2565,6 +2565,10 @@ executed a memory-mapped I/O instruction which could not be satisfied
by kvm. The 'data' member contains the written data if 'is_write' is
true, and should be filled by application code otherwise.
+The 'data' member contains, in its first 'len' bytes, the value as it would
+appear if the VCPU performed a load or store of the appropriate width directly
+to the byte array.
+
NOTE: For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_DCR,
KVM_EXIT_PAPR and KVM_EXIT_EPR the corresponding
operations are complete (and guest state is consistent) only after userspace
Applied, thanks!
Paolo
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