This hcall is VAS (Virtual Accelerator Switchboard) related. VAS is a hardware feature that allows kernelspace and userspace to communicate directly with Nested Accelerators (NX). A description of VAS can be found at [1].
QEMU does not implement neither VAS nor NXs. AIX guests will query VAS capabilities once during boot. Log this hcall as unsupported. It is worth noticing that VAS has a handful of other hcalls (H_ALLOCATE_VAS_WINDOW, H_QUERY_VAS_WINDOW, H_GET_NX_FAULT and others), but the AIX guest seems to be satisfied when H_QUERY_VAS_CAPABILITIES returns H_FUNCTION and give up trying the others. This means that there is no need to log all of them as unsupported in QEMU. [1] https://www.kernel.org/doc/html/latest/powerpc/vas-api.html Signed-off-by: Daniel Henrique Barboza <danielhb...@gmail.com> --- hw/ppc/spapr_hcall.c | 18 ++++++++++++++++++ include/hw/ppc/spapr.h | 1 + 2 files changed, 19 insertions(+) diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index db6cb6bb89..fdce44daf7 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -1589,6 +1589,20 @@ static target_ulong h_best_energy(PowerPCCPU *cpu, return H_FUNCTION; } +static target_ulong h_query_vas_capabilities(PowerPCCPU *cpu, + SpaprMachineState *spapr, + target_ulong opcode, + target_ulong *args) +{ + /* + * This HCALL is VAS (Virtual Accelerator Switchboard) related. VAS + * is not supported in QEMU. + */ + qemu_log_mask(LOG_UNSUPP, "Unsupported SPAPR hcall 0x"TARGET_FMT_lx"%s\n", + opcode, " (H_QUERY_VAS_CAPABILITIES)"); + return H_FUNCTION; +} + /* * When this handler returns, the environment is switched to the L2 guest * and TCG begins running that. spapr_exit_nested() performs the switch from @@ -1931,6 +1945,10 @@ static void hypercall_register_types(void) /* Unsupported PEM option h-calls */ spapr_register_hypercall(H_GET_EM_PARMS, h_get_em_parms); spapr_register_hypercall(H_BEST_ENERGY, h_best_energy); + + /* Unsupported VAS h-calls */ + spapr_register_hypercall(H_QUERY_VAS_CAPABILITIES, + h_query_vas_capabilities); } type_init(hypercall_register_types) diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 7995bc0cb6..10df519b0a 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -545,6 +545,7 @@ struct SpaprMachineState { #define H_INVALIDATE_PID 0x378 #define H_REGISTER_PROC_TBL 0x37C #define H_SIGNAL_SYS_RESET 0x380 +#define H_QUERY_VAS_CAPABILITIES 0x398 #define H_INT_GET_SOURCE_INFO 0x3A8 #define H_INT_SET_SOURCE_CONFIG 0x3AC -- 2.35.1
