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Before the >>>>> VM starts running, we limit the feature set to the subset we actually >>>>> support with NV. >>>>> >>>>> By doing this, we also change the value of IDreg fields that are not >>>>> writable, because they describe features that we don't support. >>>>> Obviously, that fails on restore. >>>>> >>>>> I need to have a think... >>>> >>>> We spoke about this a while ago (and I forgot til now), but I was >>>> wondering if we could use vCPU feature flags to describe NV, including >>>> the selection between FEAT_E2H0 and FEAT_VHE. >>>> >>>> I think this might match userspace expectations a bit more closely where >>>> the state of the ID registers after init gives the actual feature set >>>> supported by the VM. >>> >>> I'm not sure that's enough. Let me give you an example: >>> >>> My host has FEAT_XNX, described in ID_AA64MMFR1_EL1.XNX. For whatever >>> reason, we don't allow this field to be written to, even out of NV >>> context. This is odd, because for an EL1 VM, this field means nothing >>> at all. >> So the curprit fields for me look like >> >> - ID_AA64MMFR1_EL1.XNX >> - ID_AA64DFR0_EL1.DoubleLock >> - ID_AA64PFR0_EL1.RAS >> >> This is still based on your nv-next branch from Jan 9 >> https://github.com/eauger/linux/tree/nv_next_jan9_2025 > > I have now pushed out a new nv-next branch with the new and improved > UAPI. I expect migration to work a bit better, or at least not to > explode on ID register restore. You will notice that things have > changed a bit (extra flag and cap for FEAT_E2H0), but nothing really > major. > Tried nv-next branch and it is breaking(kernel Oops) for normal VM boot itself with qemu. Looks like this is happening since qemu is trying to write to ID_UNALLOCATED mapped registers as part of save-restore of registers. Below diff fixes the issue, [root@sut08sys-r112 arm-platforms]# git diff arch/arm64/kvm/sys_regs.c diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index e6f4599dca48..9459d25d4902 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2310,6 +2310,7 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu, .get_user = get_id_reg, \ .set_user = set_id_reg, \ .visibility = raz_visibility, \ + .reset = kvm_read_sanitised_id_reg, \ .val = 0, \ } #define ID_UNALLOCATED(crm, op2) { \ Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \ .access = access_id_reg, \ .get_user = get_id_reg, \ .set_user = set_id_reg, \ .visibility = raz_visibility, \ .reset = kvm_read_sanitised_id_reg, \ .val = 0, \ } -- Thanks, Ganapat/GK