This address is changed by the linux kernel using the H_SET_MODE hcall and needs to be migrated in order to restart a spapr VM running in TCG. This can be done using the AIL bits from the LPCR register.
The patch introduces a spapr_h_set_mode_resource_addr() helper to share some code with the H_SET_MODE hcall. Signed-off-by: Cédric Le Goater <c...@fr.ibm.com> --- hw/ppc/spapr.c | 21 +++++++++++++++++++++ hw/ppc/spapr_hcall.c | 13 ++----------- include/hw/ppc/spapr.h | 14 ++++++++++++++ 3 files changed, 37 insertions(+), 11 deletions(-) Index: qemu-dgibson-for-2.6.git/hw/ppc/spapr.c =================================================================== --- qemu-dgibson-for-2.6.git.orig/hw/ppc/spapr.c +++ qemu-dgibson-for-2.6.git/hw/ppc/spapr.c @@ -1244,6 +1244,24 @@ static bool spapr_vga_init(PCIBus *pci_b } } +static int load_excp_prefix(void) +{ + CPUState *cs; + + CPU_FOREACH(cs) { + CPUPPCState *env = &POWERPC_CPU(cs)->env; + int ail = (env->spr[SPR_LPCR] & LPCR_AIL) >> LPCR_AIL_SHIFT; + + env->excp_prefix = spapr_h_set_mode_resource_addr(ail); + if (env->excp_prefix == H_UNSUPPORTED_FLAG) { + error_report("LPCR has an invalid AIL value"); + return -EINVAL; + } + } + + return 0; +} + static int spapr_post_load(void *opaque, int version_id) { sPAPRMachineState *spapr = (sPAPRMachineState *)opaque; @@ -1257,6 +1275,9 @@ static int spapr_post_load(void *opaque, err = spapr_rtc_import_offset(spapr->rtc, spapr->rtc_offset); } + if (!err) { + err = load_excp_prefix(); + } return err; } Index: qemu-dgibson-for-2.6.git/include/hw/ppc/spapr.h =================================================================== --- qemu-dgibson-for-2.6.git.orig/include/hw/ppc/spapr.h +++ qemu-dgibson-for-2.6.git/include/hw/ppc/spapr.h @@ -561,6 +561,20 @@ struct sPAPREventLogEntry { QTAILQ_ENTRY(sPAPREventLogEntry) next; }; +static inline target_ulong spapr_h_set_mode_resource_addr(target_ulong mflags) +{ + switch (mflags) { + case H_SET_MODE_ADDR_TRANS_NONE: + return 0; + case H_SET_MODE_ADDR_TRANS_0001_8000: + return 0x18000; + case H_SET_MODE_ADDR_TRANS_C000_0000_0000_4000: + return 0xC000000000004000ULL; + default: + return H_UNSUPPORTED_FLAG; + } +} + void spapr_events_init(sPAPRMachineState *sm); void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq); int spapr_h_cas_compose_response(sPAPRMachineState *sm, Index: qemu-dgibson-for-2.6.git/hw/ppc/spapr_hcall.c =================================================================== --- qemu-dgibson-for-2.6.git.orig/hw/ppc/spapr_hcall.c +++ qemu-dgibson-for-2.6.git/hw/ppc/spapr_hcall.c @@ -835,17 +835,8 @@ static target_ulong h_set_mode_resource_ return H_P4; } - switch (mflags) { - case H_SET_MODE_ADDR_TRANS_NONE: - prefix = 0; - break; - case H_SET_MODE_ADDR_TRANS_0001_8000: - prefix = 0x18000; - break; - case H_SET_MODE_ADDR_TRANS_C000_0000_0000_4000: - prefix = 0xC000000000004000ULL; - break; - default: + prefix = spapr_h_set_mode_resource_addr(mflags); + if (prefix == H_UNSUPPORTED_FLAG) { return H_UNSUPPORTED_FLAG; }