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target/ppc: Retain hflags_nmsr only for migration 

We have eliminated all normal uses of hflags_nmsr.  We need
not even compute it except when we want to migrate.  Rename
the field to emphasize this.

Remove the fixme comment for migrating access_type.  This value
is only ever used with the current executing instruction, and
is never live when the cpu is halted for migration.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210315184615.1985590-6-richard.henderson@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2021-03-15 12:46:03 -06:00 committed by David Gibson
parent da77d2b037
commit f7a7b6525c
3 changed files with 8 additions and 7 deletions
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4
target/ppc/cpu.h
View File

@ -1105,8 +1105,8 @@ struct CPUPPCState {
#endif
/* These resources are used only in QEMU core */
target_ulong hflags; /* hflags is MSR & HFLAGS_MASK */
target_ulong hflags_nmsr; /* specific hflags, not coming from MSR */
target_ulong hflags;
target_ulong hflags_compat_nmsr; /* for migration compatibility */
int immu_idx; /* precomputed MMU index to speed up insn accesses */
int dmmu_idx; /* precomputed MMU index to speed up data accesses */

2
target/ppc/helper_regs.c
View File

@ -104,8 +104,6 @@ void hreg_compute_hflags(CPUPPCState *env)
*/
uint32_t le = extract32(env->spr[SPR_HID0], 3, 1);
env->hflags |= le << MSR_LE;
/* Retain for backward compatibility with migration. */
env->hflags_nmsr = le << MSR_LE;
}
}

9
target/ppc/machine.c
View File

@ -310,6 +310,10 @@ static int cpu_pre_save(void *opaque)
}
}
/* Retain migration compatibility for pre 6.0 for 601 machines. */
env->hflags_compat_nmsr = (env->flags & POWERPC_FLAG_HID0_LE
? env->hflags & MSR_LE : 0);
return 0;
}
@ -829,9 +833,8 @@ const VMStateDescription vmstate_ppc_cpu = {
/* Supervisor mode architected state */
VMSTATE_UINTTL(env.msr, PowerPCCPU),
/* Internal state */
VMSTATE_UINTTL(env.hflags_nmsr, PowerPCCPU),
/* FIXME: access_type? */
/* Backward compatible internal state */
VMSTATE_UINTTL(env.hflags_compat_nmsr, PowerPCCPU),
/* Sanity checking */
VMSTATE_UINTTL_TEST(mig_msr_mask, PowerPCCPU, cpu_pre_2_8_migration),