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Re: [Qemu-devel] [PATCH v4 13/13] target-arm: Add support for S1 + S2 MM
From: |
Edgar E. Iglesias |
Subject: |
Re: [Qemu-devel] [PATCH v4 13/13] target-arm: Add support for S1 + S2 MMU translations |
Date: |
Mon, 26 Oct 2015 13:33:14 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Oct 23, 2015 at 06:09:24PM +0100, Peter Maydell wrote:
> On 14 October 2015 at 23:55, Edgar E. Iglesias <address@hidden> wrote:
> > From: "Edgar E. Iglesias" <address@hidden>
> >
> > Signed-off-by: Edgar E. Iglesias <address@hidden>
> > ---
> > target-arm/helper.c | 44 +++++++++++++++++++++++++++++++++++++-------
> > 1 file changed, 37 insertions(+), 7 deletions(-)
> >
> > diff --git a/target-arm/helper.c b/target-arm/helper.c
> > index 69e24e1..9d70ef2 100644
> > --- a/target-arm/helper.c
> > +++ b/target-arm/helper.c
> > @@ -7129,14 +7129,44 @@ static bool get_phys_addr(CPUARMState *env,
> > target_ulong address,
> > ARMMMUFaultInfo *fi)
> > {
> > if (mmu_idx == ARMMMUIdx_S12NSE0 || mmu_idx == ARMMMUIdx_S12NSE1) {
> > - /* TODO: when we support EL2 we should here call ourselves
> > recursively
> > - * to do the stage 1 and then stage 2 translations. The arm_ld*_ptw
> > - * functions will also need changing to perform ARMMMUIdx_S2NS
> > loads
> > - * rather than direct physical memory loads when appropriate.
> > - * For non-EL2 CPUs a stage1+stage2 translation is just stage 1.
> > + /* Call ourselves recursively to do the stage 1 and then stage 2
> > + * translations.
> > */
> > - assert(!arm_feature(env, ARM_FEATURE_EL2));
> > - mmu_idx += ARMMMUIdx_S1NSE0;
> > + if (arm_feature(env, ARM_FEATURE_EL2)) {
> > + hwaddr ipa;
> > + int s2_prot;
> > + int ret;
> > +
> > + ret = get_phys_addr(env, address, access_type,
> > + mmu_idx + ARMMMUIdx_S1NSE0, &ipa, attrs,
> > + prot, page_size, fsr, fi);
> > +
> > + /* If S1 fails or S2 is disabled, return early. */
> > + if (ret || regime_translation_disabled(env, ARMMMUIdx_S2NS)) {
> > + if (ret && fi->stage2) {
> > + /* This is a S2 error while doing S1 PTW. */
> > + env->cp15.hpfar_el2 = extract64(fi->s2addr, 12, 47) <<
> > 4;
>
> Might be worth a note that it's OK to set the HPFAR here because
> this always results in a fault (even if from an AT instruction),
> whereas we can't set the FAR registers here because that doesn't
> happen for stage 1 faults from AT instructions.
>
> ...I think we still need to add the code to cause the exception
> if a stage 1 AT instruction results in a stage 2 fault, right?
Yes, those faults are still missing... I can try to add them
in the next round/series together with the detailed error reporting.
> If the caller has to look into the FaultInfo struct anyway, maybe
> we should just let the caller set the HPFAR_EL2 from the s2addr
> if it's going to send the exception to EL2.
Agreed, I've moved the setting of HPFAR_EL2 to the callers.
Thanks!
Edgar
>
> > + }
> > + *phys_ptr = ipa;
> > + return ret;
> > + }
> > +
> > + /* S1 is done. Now do S2 translation. */
> > + ret = get_phys_addr_lpae(env, ipa, access_type, ARMMMUIdx_S2NS,
> > + phys_ptr, attrs, &s2_prot,
> > + page_size, fsr, fi);
> > + if (ret) {
> > + env->cp15.hpfar_el2 = extract64(ipa, 12, 47) << 4;
> > + }
> > + /* Combine the S1 and S2 perms. */
> > + *prot &= s2_prot;
> > + return ret;
> > + } else {
> > + /*
> > + * For non-EL2 CPUs a stage1+stage2 translation is just stage
> > 1.
> > + */
> > + mmu_idx += ARMMMUIdx_S1NSE0;
> > + }
> > }
> >
> > /* The page table entries may downgrade secure to non-secure, but
> > --
> > 1.9.1
> >
>
> thanks
> -- PMM
- [Qemu-devel] [PATCH v4 09/13] target-arm: Add ARMMMUFaultInfo, (continued)
- [Qemu-devel] [PATCH v4 09/13] target-arm: Add ARMMMUFaultInfo, Edgar E. Iglesias, 2015/10/14
- [Qemu-devel] [PATCH v4 10/13] target-arm: Add S2 translation to 64bit S1 PTWs, Edgar E. Iglesias, 2015/10/14
- [Qemu-devel] [PATCH v4 07/13] target-arm: Add support for S2 page-table protection bits, Edgar E. Iglesias, 2015/10/14
- [Qemu-devel] [PATCH v4 08/13] target-arm: Avoid inline for get_phys_addr, Edgar E. Iglesias, 2015/10/14
- [Qemu-devel] [PATCH v4 13/13] target-arm: Add support for S1 + S2 MMU translations, Edgar E. Iglesias, 2015/10/14
- [Qemu-devel] [PATCH v4 05/13] target-arm: lpae: Rename granule_sz to stride, Edgar E. Iglesias, 2015/10/15
- [Qemu-devel] [PATCH v4 06/13] target-arm: Add computation of starting level for S2 PTW, Edgar E. Iglesias, 2015/10/15