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KVM: PPC: Add OSI hypercall interface

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MOL uses its own hypercall interface to call back into userspace when
the guest wants to do something.

So let's implement that as an exit reason, specify it with a CAP and
only really use it when userspace wants us to.

The only user of it so far is MOL.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2010-03-24 21:48:30 +01:00
committed by Avi Kivity
parent 71fbfd5f38
commit ad0a048b09
6 changed files with 59 additions and 9 deletions
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19
Documentation/kvm/api.txt
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@@ -958,9 +958,9 @@ 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
NOTE: For KVM_EXIT_IO, KVM_EXIT_MMIO and KVM_EXIT_OSI, 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.
@@ -1015,6 +1015,19 @@ s390 specific.
powerpc specific.
/* KVM_EXIT_OSI */
struct {
__u64 gprs[32];
} osi;
MOL uses a special hypercall interface it calls 'OSI'. To enable it, we catch
hypercalls and exit with this exit struct that contains all the guest gprs.
If exit_reason is KVM_EXIT_OSI, then the vcpu has triggered such a hypercall.
Userspace can now handle the hypercall and when it's done modify the gprs as
necessary. Upon guest entry all guest GPRs will then be replaced by the values
in this struct.
/* Fix the size of the union. */
char padding[256];
};