On Mon, Feb 26, 2024 at 9:22 AM Zhao Liu <[email protected]> wrote:
> On Fri, Feb 23, 2024 at 02:09:45PM +0100, Paolo Bonzini wrote:
> > Accesses from a 32-bit environment (32-bit code segment for instruction
> > accesses, EFER.LMA==0 for processor accesses) have to mask away the
> > upper 32 bits of the address. While a bit wasteful, the easiest way
> > to do so is to use separate MMU indexes. These days, QEMU anyway is
> > compiled with a fixed value for NB_MMU_MODES. Split MMU_USER_IDX,
> > MMU_KSMAP_IDX and MMU_KNOSMAP_IDX in two.
>
> Maybe s/in/into/ ?
Both are acceptable grammar.
> > static inline int cpu_mmu_index_kernel(CPUX86State *env)
> > {
> > - return !(env->hflags & HF_SMAP_MASK) ? MMU_KNOSMAP_IDX :
> > - ((env->hflags & HF_CPL_MASK) < 3 && (env->eflags & AC_MASK))
> > - ? MMU_KNOSMAP_IDX : MMU_KSMAP_IDX;
> > + int mmu_index_32 = (env->hflags & HF_LMA_MASK) ? 1 : 0;
> > + int mmu_index_base =
> > + !(env->hflags & HF_SMAP_MASK) ? MMU_KNOSMAP64_IDX :
> > + ((env->hflags & HF_CPL_MASK) < 3 && (env->eflags & AC_MASK)) ?
> > MMU_KNOSMAP64_IDX : MMU_KSMAP64_IDX;
> Change the line?
It's reformatted but the logic is the same.
- if !SMAP -> MMU_KNOSMAP_IDX
- if CPL < 3 && EFLAGS.AC - MMU_KNOSMAP_IDX
- else MMU_KSMAP_IDX
The only change is adding the "64" suffix, which is then changed to
32-bit if needed via mmu_index_32.
Paolo
