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KVM: add doc note about PIO/MMIO completion API

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Document that partially emulated instructions leave the guest state
inconsistent, and that the kernel will complete operations before
checking for pending signals.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-02-13 16:10:26 -02:00 committed by Avi Kivity
parent 1ef6ce7a34
commit 679613442f
1 changed files with 7 additions and 0 deletions
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7
Documentation/kvm/api.txt
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@ -820,6 +820,13 @@ 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 will first finish
incomplete operations and then check for pending signals. Userspace
can re-enter the guest with an unmasked signal pending to complete
pending operations.
/* KVM_EXIT_HYPERCALL */
struct {
__u64 nr;