On 28.09.20 08:20, Jan Kiszka wrote: > On 28.09.20 07:57, Jan Kiszka wrote: >>>>> >>>>> You could try to not bypass SMMU transition in smmu driver, then the >>>>> system might not work well. >>>> >>>> Where is this bypass controlled? In the SMMU settings? Or is that >>>> platform-specific? >>> >>> S2CR_TYPE_BYPASS, smmu settings currently. >> >> Just flipping the type does not seem to be enough. Could you tell me >> what is needed to switch to "block what is is not permitted"? > > Looking at the kernel, these two changes are apparently needed: > > diff --git a/hypervisor/arch/arm64/smmu.c b/hypervisor/arch/arm64/smmu.c > index 69374b28..ea58340d 100644 > --- a/hypervisor/arch/arm64/smmu.c > +++ b/hypervisor/arch/arm64/smmu.c > @@ -534,7 +534,7 @@ static int arm_smmu_device_reset(struct arm_smmu_device > *smmu) > > /* Enable client access, handling unmatched streams as appropriate */ > reg &= ~sCR0_CLIENTPD; > - reg &= ~sCR0_USFCFG; > + reg |= sCR0_USFCFG; > > /* Disable forced broadcasting */ > reg &= ~sCR0_FB; > @@ -637,9 +637,8 @@ static int arm_smmu_device_cfg_probe(struct > arm_smmu_device *smmu) > > smmu->cfgs = (struct arm_smmu_cfg *)(smmu->s2crs + size); > > - /* Configure to Bypass mode */ > for (i = 0; i < size; i++) > - smmu->s2crs[i] = s2cr_init_val; > + smmu->s2crs[i].type = S2CR_TYPE_FAULT; > > smmu->num_mapping_groups = size; > > > However, only if I remove all sids from the root cell config of the > zynqmp (num_stream_ids = 0), blocking starts to work. As soon as I have > /any/ sid listed, /all/ transfers pass. I'm using 0x3fff as sid_mask > which covers all 14 bits that are used by that SOC. >
Could you comment on this? Is this behavior different, more consistent on the i.MX8? Jan -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/dc3c6437-f508-4632-46ab-6268b948b280%40web.de.
