Re: [PATCH v4 03/17] target/ppc: Properly sync cpu state with new msr in cpu_load_old

[David Gibson]

On Mon, Mar 15, 2021 at 12:46:01PM -0600, Richard Henderson wrote:
> Match cpu_post_load in using ppc_store_msr to set all of
> the cpu state implied by the value of msr.  Do not restore
> hflags or hflags_nmsr, as we recompute them in ppc_store_msr.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Applied to ppc-for-6.0, thanks.

> ---
>  target/ppc/machine.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/target/ppc/machine.c b/target/ppc/machine.c
> index 283db1d28a..87d7bffb86 100644
> --- a/target/ppc/machine.c
> +++ b/target/ppc/machine.c
> @@ -21,6 +21,7 @@ static int cpu_load_old(QEMUFile *f, void *opaque, int 
> version_id)
>      int32_t slb_nr;
>  #endif
>      target_ulong xer;
> +    target_ulong msr;
>  
>      for (i = 0; i < 32; i++) {
>          qemu_get_betls(f, &env->gpr[i]);
> @@ -111,11 +112,19 @@ static int cpu_load_old(QEMUFile *f, void *opaque, int 
> version_id)
>      qemu_get_betls(f, &env->ivpr_mask);
>      qemu_get_betls(f, &env->hreset_vector);
>      qemu_get_betls(f, &env->nip);
> -    qemu_get_betls(f, &env->hflags);
> -    qemu_get_betls(f, &env->hflags_nmsr);
> +    qemu_get_sbetl(f); /* Discard unused hflags */
> +    qemu_get_sbetl(f); /* Discard unused hflags_nmsr */
>      qemu_get_sbe32(f); /* Discard unused mmu_idx */
>      qemu_get_sbe32(f); /* Discard unused power_mode */
>  
> +    /*
> +     * Invalidate all supported msr bits except MSR_TGPR/MSR_HVB
> +     * before restoring.  Note that this recomputes hflags and mem_idx.
> +     */
> +    msr = env->msr;
> +    env->msr ^= env->msr_mask & ~((1ULL << MSR_TGPR) | MSR_HVB);
> +    ppc_store_msr(env, msr);
> +
>      /* Recompute mmu indices */
>      hreg_compute_mem_idx(env);
>  

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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