On 02/13/2010 08:10 PM, Marcelo Tosatti wrote:
How's that? Feel free to upgrade it.
------
Document that partially emulated instructions leave the guest state
unconsistent, and that the kernel must complete operations before
checking for pending signals.
Signed-off-by: Marcelo Tosatti<[email protected]>
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index c6416a3..ec0e72b 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm/api.txt
@@ -820,6 +820,11 @@ 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.
+NOTE: For KVM_EXIT_IO and KVM_EXIT_MMIO, the corresponding operations
+are complete (and guest state is consistent) only after userspace has
+re-entered the kernel with KVM_RUN. The kernel side must first finish
+uncomplete operations and then check for pending signals.
+
Well, s/must/will/, the document is written from userspace's point of view.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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