spapr: Fix RTAS token numbers

At the moment spapr_rtas_register() allocates a new token number for every
new RTAS callback so numbers are not fixed and depend on the number of
supported RTAS handlers and the exact order of spapr_rtas_register() calls.
These tokens are copied into the device tree and remain the same during
the guest lifetime.

When we start another guest to receive a migration, it calls
spapr_rtas_register() as well. If the number of RTAS handlers or their
order is different in QEMU on source and destination sides, the "/rtas"
node in the device tree will differ. Since migration overwrites the device
tree (as it overwrites the entire RAM), the actual RTAS config on
the destination side gets broken.

This defines global contant values for every RTAS token which QEMU
is using today.

This changes spapr_rtas_register() to accept a token number instead of
allocating one. This changes all users of spapr_rtas_register().

This changes XICS-KVM not to cache tokens registered with KVM as they
constant now.

This makes TOKEN_BASE global as RTAS_XXX use TOKEN_BASE as
a base. TOKEN_MAX is moved and renamed too and its value is changed
to the last token + 1. Boundary checks for token values are adjusted.

This reserves token numbers for "os-term" handlers and PCI hotplug
which we are working on.

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

1 files changed, 40 insertions, 1 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 08c301f..91923de 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -358,6 +358,45 @@ static inline int spapr_allocate_lsi(int hint)
 #define RTAS_OUT_NOT_SUPPORTED      -3
 #define RTAS_OUT_NOT_AUTHORIZED     -9002
 
+/* RTAS tokens */
+#define RTAS_TOKEN_BASE      0x2000
+
+#define RTAS_DISPLAY_CHARACTER                  (RTAS_TOKEN_BASE + 0x00)
+#define RTAS_GET_TIME_OF_DAY                    (RTAS_TOKEN_BASE + 0x01)
+#define RTAS_SET_TIME_OF_DAY                    (RTAS_TOKEN_BASE + 0x02)
+#define RTAS_POWER_OFF                          (RTAS_TOKEN_BASE + 0x03)
+#define RTAS_SYSTEM_REBOOT                      (RTAS_TOKEN_BASE + 0x04)
+#define RTAS_QUERY_CPU_STOPPED_STATE            (RTAS_TOKEN_BASE + 0x05)
+#define RTAS_START_CPU                          (RTAS_TOKEN_BASE + 0x06)
+#define RTAS_STOP_SELF                          (RTAS_TOKEN_BASE + 0x07)
+#define RTAS_IBM_GET_SYSTEM_PARAMETER           (RTAS_TOKEN_BASE + 0x08)
+#define RTAS_IBM_SET_SYSTEM_PARAMETER           (RTAS_TOKEN_BASE + 0x09)
+#define RTAS_IBM_SET_XIVE                       (RTAS_TOKEN_BASE + 0x0A)
+#define RTAS_IBM_GET_XIVE                       (RTAS_TOKEN_BASE + 0x0B)
+#define RTAS_IBM_INT_OFF                        (RTAS_TOKEN_BASE + 0x0C)
+#define RTAS_IBM_INT_ON                         (RTAS_TOKEN_BASE + 0x0D)
+#define RTAS_CHECK_EXCEPTION                    (RTAS_TOKEN_BASE + 0x0E)
+#define RTAS_EVENT_SCAN                         (RTAS_TOKEN_BASE + 0x0F)
+#define RTAS_IBM_SET_TCE_BYPASS                 (RTAS_TOKEN_BASE + 0x10)
+#define RTAS_QUIESCE                            (RTAS_TOKEN_BASE + 0x11)
+#define RTAS_NVRAM_FETCH                        (RTAS_TOKEN_BASE + 0x12)
+#define RTAS_NVRAM_STORE                        (RTAS_TOKEN_BASE + 0x13)
+#define RTAS_READ_PCI_CONFIG                    (RTAS_TOKEN_BASE + 0x14)
+#define RTAS_WRITE_PCI_CONFIG                   (RTAS_TOKEN_BASE + 0x15)
+#define RTAS_IBM_READ_PCI_CONFIG                (RTAS_TOKEN_BASE + 0x16)
+#define RTAS_IBM_WRITE_PCI_CONFIG               (RTAS_TOKEN_BASE + 0x17)
+#define RTAS_IBM_QUERY_INTERRUPT_SOURCE_NUMBER  (RTAS_TOKEN_BASE + 0x18)
+#define RTAS_IBM_CHANGE_MSI                     (RTAS_TOKEN_BASE + 0x19)
+#define RTAS_SET_INDICATOR                      (RTAS_TOKEN_BASE + 0x1A)
+#define RTAS_SET_POWER_LEVEL                    (RTAS_TOKEN_BASE + 0x1B)
+#define RTAS_GET_POWER_LEVEL                    (RTAS_TOKEN_BASE + 0x1C)
+#define RTAS_GET_SENSOR_STATE                   (RTAS_TOKEN_BASE + 0x1D)
+#define RTAS_IBM_CONFIGURE_CONNECTOR            (RTAS_TOKEN_BASE + 0x1E)
+#define RTAS_IBM_OS_TERM                        (RTAS_TOKEN_BASE + 0x1F)
+#define RTAS_IBM_EXTENDED_OS_TERM               (RTAS_TOKEN_BASE + 0x20)
+
+#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x21)
+
 static inline uint64_t ppc64_phys_to_real(uint64_t addr)
 {
     return addr & ~0xF000000000000000ULL;
@@ -377,7 +416,7 @@ typedef void (*spapr_rtas_fn)(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                               uint32_t token,
                               uint32_t nargs, target_ulong args,
                               uint32_t nret, target_ulong rets);
-int spapr_rtas_register(const char *name, spapr_rtas_fn fn);
+void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn);
 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                              uint32_t token, uint32_t nargs, target_ulong args,
                              uint32_t nret, target_ulong rets);