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authorAlexey Kardashevskiy <aik@ozlabs.ru>2014-05-23 12:26:54 +1000
committerAlexander Graf <agraf@suse.de>2014-06-16 13:24:37 +0200
commit2a6593cb6a2d72c8c29e14f89413089fa5d38501 (patch)
tree75adfca2dc85618d35328708224f9f7593d3ed69 /trace-events
parent1a68b71419406235bbde205463f2bd7e4ffe5b26 (diff)
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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>
Diffstat (limited to 'trace-events')
-rw-r--r--trace-events4
1 files changed, 4 insertions, 0 deletions
diff --git a/trace-events b/trace-events
index b35c39b..9f12843 100644
--- a/trace-events
+++ b/trace-events
@@ -1189,6 +1189,10 @@ xics_ics_write_xive(int nr, int srcno, int server, uint8_t priority) "ics_write_
xics_ics_reject(int nr, int srcno) "reject irq %#x [src %d]"
xics_ics_eoi(int nr) "ics_eoi: irq %#x"
+# hw/ppc/spapr.c
+spapr_cas_failed(unsigned long n) "DT diff buffer is too small: %ld bytes"
+spapr_cas_continue(unsigned long n) "Copy changes to the guest: %ld bytes"
+
# hw/ppc/spapr_iommu.c
spapr_iommu_put(uint64_t liobn, uint64_t ioba, uint64_t tce, uint64_t ret) "liobn=%"PRIx64" ioba=0x%"PRIx64" tce=0x%"PRIx64" ret=%"PRId64
spapr_iommu_get(uint64_t liobn, uint64_t ioba, uint64_t ret, uint64_t tce) "liobn=%"PRIx64" ioba=0x%"PRIx64" ret=%"PRId64" tce=0x%"PRIx64