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target/ppc: Only calculate RMLS derived RMA limit on demand 

When the LPCR is written, we update the env->rmls field with the RMA limit
it implies.  Simplify things by just calculating the value directly from
the LPCR value when we need it.

It's possible this is a little slower, but it's unlikely to be significant,
since this is only for real mode accesses in a translation configuration
that's not used very often, and the whole thing is behind the qemu TLB
anyway.  Therefore, keeping the number of state variables down and not
having to worry about making sure it's always in sync seems the better
option.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
David Gibson 2020-01-06 17:26:24 +11:00
parent d37b40daf6
commit 3a56a55ccb
2 changed files with 6 additions and 4 deletions
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1
target/ppc/cpu.h
View File

@ -1046,7 +1046,6 @@ struct CPUPPCState {
uint64_t insns_flags2;
#if defined(TARGET_PPC64)
ppc_slb_t vrma_slb;
target_ulong rmls;
#endif
int error_code;

9
target/ppc/mmu-hash64.c
View File

@ -837,8 +837,10 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
goto skip_slb_search;
} else {
target_ulong limit = rmls_limit(cpu);
/* Emulated old-style RMO mode, bounds check against RMLS */
if (raddr >= env->rmls) {
if (raddr >= limit) {
if (rwx == 2) {
ppc_hash64_set_isi(cs, SRR1_PROTFAULT);
} else {
@ -1000,8 +1002,10 @@ hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
return -1;
}
} else {
target_ulong limit = rmls_limit(cpu);
/* Emulated old-style RMO mode, bounds check against RMLS */
if (raddr >= env->rmls) {
if (raddr >= limit) {
return -1;
}
return raddr | env->spr[SPR_RMOR];
@ -1091,7 +1095,6 @@ void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
CPUPPCState *env = &cpu->env;
env->spr[SPR_LPCR] = val & pcc->lpcr_mask;
env->rmls = rmls_limit(cpu);
ppc_hash64_update_vrma(cpu);
}