On 03/08/2010 08:03 PM, Alexander Graf wrote:
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<[email protected]>
---
v1 -> v2:
- Add documentation for OSI exit struct
---
Documentation/kvm/api.txt | 13 +++++++++++++
arch/powerpc/include/asm/kvm_book3s.h | 5 +++++
arch/powerpc/include/asm/kvm_host.h | 2 ++
arch/powerpc/kvm/book3s.c | 24 ++++++++++++++++++------
arch/powerpc/kvm/powerpc.c | 12 ++++++++++++
include/linux/kvm.h | 6 ++++++
6 files changed, 56 insertions(+), 6 deletions(-)
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index 6a19ab6..b2129e8 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm/api.txt
@@ -932,6 +932,19 @@ 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.
+
That's migration unsafe. There may not be next guest entry on this host.
Is using KVM_[GS]ET_REGS problematic for some reason?
--
error compiling committee.c: too many arguments to function
--
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