On 01/02/2021 20.56, Marc Zyngier wrote:
As we are aiming to be able to control whether we enable VHE or not, let's always drop down to EL1 first, and only then upgrade to VHE if at all possible. This means that if the kernel is booted at EL2, we always start with a nVHE init, drop to EL1 to initialise the the kernel, and only then upgrade the kernel EL to EL2 if possible (the process is obviously shortened for secondary CPUs).
Unfortunately, this is going to break on Apple SoCs, where it turns out HCR_EL2.E2H is hard-wired to 1 - there is no nVHE mode. :(
>>> mrs(HCR_EL2) & (1<<34) 0x400000000 >>> msr(HCR_EL2, mrs(HCR_EL2) & ~(1<<34)) >>> mrs(HCR_EL2) & (1<<34) 0x400000000 -- Hector Martin "marcan" (marcan@xxxxxxxxx) Public Key: https://mrcn.st/pub _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
