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target/ppc/spapr: Add H-Call H_GET_CPU_CHARACTERISTICS

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The new H-Call H_GET_CPU_CHARACTERISTICS is used by the guest to query
behaviours and available characteristics of the cpu.

Implement the handler for this new H-Call which formulates its response
based on the setting of the spapr_caps cap-cfpc, cap-sbbc and cap-ibs.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Suraj Jitindar Singh 2018-01-19 16:00:05 +11:00 committed by David Gibson
parent 4be8d4e7d9
commit c59704b254
2 changed files with 59 additions and 0 deletions
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58
hw/ppc/spapr_hcall.c
View File

@ -1654,6 +1654,60 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
return H_SUCCESS;
}
static target_ulong h_get_cpu_characteristics(PowerPCCPU *cpu,
sPAPRMachineState *spapr,
target_ulong opcode,
target_ulong *args)
{
uint64_t characteristics = H_CPU_CHAR_HON_BRANCH_HINTS &
~H_CPU_CHAR_THR_RECONF_TRIG;
uint64_t behaviour = H_CPU_BEHAV_FAVOUR_SECURITY;
uint8_t safe_cache = spapr_get_cap(spapr, SPAPR_CAP_CFPC);
uint8_t safe_bounds_check = spapr_get_cap(spapr, SPAPR_CAP_SBBC);
uint8_t safe_indirect_branch = spapr_get_cap(spapr, SPAPR_CAP_IBS);
switch (safe_cache) {
case SPAPR_CAP_WORKAROUND:
characteristics |= H_CPU_CHAR_L1D_FLUSH_ORI30;
characteristics |= H_CPU_CHAR_L1D_FLUSH_TRIG2;
characteristics |= H_CPU_CHAR_L1D_THREAD_PRIV;
behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
break;
case SPAPR_CAP_FIXED:
break;
default: /* broken */
assert(safe_cache == SPAPR_CAP_BROKEN);
behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
break;
}
switch (safe_bounds_check) {
case SPAPR_CAP_WORKAROUND:
characteristics |= H_CPU_CHAR_SPEC_BAR_ORI31;
behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
break;
case SPAPR_CAP_FIXED:
break;
default: /* broken */
assert(safe_bounds_check == SPAPR_CAP_BROKEN);
behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
break;
}
switch (safe_indirect_branch) {
case SPAPR_CAP_FIXED:
characteristics |= H_CPU_CHAR_BCCTRL_SERIALISED;
default: /* broken */
assert(safe_indirect_branch == SPAPR_CAP_BROKEN);
break;
}
args[0] = characteristics;
args[1] = behaviour;
return H_SUCCESS;
}
static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE + 1];
@ -1733,6 +1787,10 @@ static void hypercall_register_types(void)
spapr_register_hypercall(H_INVALIDATE_PID, h_invalidate_pid);
spapr_register_hypercall(H_REGISTER_PROC_TBL, h_register_process_table);
/* hcall-get-cpu-characteristics */
spapr_register_hypercall(H_GET_CPU_CHARACTERISTICS,
h_get_cpu_characteristics);
/* "debugger" hcalls (also used by SLOF). Note: We do -not- differenciate
* here between the "CI" and the "CACHE" variants, they will use whatever
* mapping attributes qemu is using. When using KVM, the kernel will

1
include/hw/ppc/spapr.h
View File

@ -404,6 +404,7 @@ struct sPAPRMachineState {
#define H_GET_HCA_INFO 0x1B8
#define H_GET_PERF_COUNT 0x1BC
#define H_MANAGE_TRACE 0x1C0
#define H_GET_CPU_CHARACTERISTICS 0x1C8
#define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
#define H_QUERY_INT_STATE 0x1E4
#define H_POLL_PENDING 0x1D8