spapr: Add ibm, client-architecture-support call

The PAPR+ specification defines a ibm,client-architecture-support (CAS)
RTAS call which purpose is to provide a negotiation mechanism for
the guest and the hypervisor to work out the best compatibility parameters.
During the negotiation process, the guest provides an array of various
options and capabilities which it supports, the hypervisor adjusts
the device tree and (optionally) reboots the guest.

At the moment the Linux guest calls CAS method at early boot so SLOF
gets called. SLOF allocates a memory buffer for the device tree changes
and calls a custom KVMPPC_H_CAS hypercall. QEMU parses the options,
composes a diff for the device tree, copies it to the buffer provided
by SLOF and returns to SLOF. SLOF updates the device tree and returns
control to the guest kernel. Only then the Linux guest parses the device
tree so it is possible to avoid unnecessary reboot in most cases.

The device tree diff is a header with an update format version
(defined as 1 in this patch) followed by a device tree with the properties
which require update.

If QEMU detects that it has to reboot the guest, it silently does so
as the guest expects reboot to happen because this is usual pHyp firmware
behavior.

This defines custom KVMPPC_H_CAS hypercall. The current SLOF already
has support for it.

This implements stub which returns very basic tree (root node,
no properties) to the guest.

As the return buffer does not contain any change, no change in behavior is
expected.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 9f8bb89600..b8c2ba4a4d 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -303,10 +303,16 @@ typedef struct sPAPREnvironment {
 #define KVMPPC_HCALL_BASE       0xf000
 #define KVMPPC_H_RTAS           (KVMPPC_HCALL_BASE + 0x0)
 #define KVMPPC_H_LOGICAL_MEMOP  (KVMPPC_HCALL_BASE + 0x1)
-#define KVMPPC_HCALL_MAX        KVMPPC_H_LOGICAL_MEMOP
+/* Client Architecture support */
+#define KVMPPC_H_CAS            (KVMPPC_HCALL_BASE + 0x2)
+#define KVMPPC_HCALL_MAX        KVMPPC_H_CAS
 
 extern sPAPREnvironment *spapr;
 
+typedef struct sPAPRDeviceTreeUpdateHeader {
+    uint32_t version_id;
+} sPAPRDeviceTreeUpdateHeader;
+
 /*#define DEBUG_SPAPR_HCALLS*/
 
 #ifdef DEBUG_SPAPR_HCALLS
@@ -402,6 +408,7 @@ struct sPAPRTCETable {
 
 void spapr_events_init(sPAPREnvironment *spapr);
 void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq);
+int spapr_h_cas_compose_response(target_ulong addr, target_ulong size);
 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
                                    size_t window_size);
 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet);