Hi Frediano, On Fri, 2015-02-06 at 12:14 +0000, Frediano Ziglio wrote: > 2015-02-06 10:56 GMT+00:00 AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>: > >> Frediano Ziglio wrote: > >> The kernel code is supposed (at least in ARMv7) to run in SVC mode, > >> not on HYP mode. One reason is that code that change SCTLR executed at > >> HYP instead of SVC would not change current mode system control > >> register. The function does not revert to HYP for this reason. > > > > I need understand what you mentioned here, but for arm64, Geoff's kexec lets > > the boot cpu in hyp mode at soft_restart(). > > Where's Geoff code? Note however that is not maintainable in this way > as people have to consider that future code could execute in either > HYP or SVC mode. Did you test that all code called from soft_restart > could do it? Basically, when a CPU is reset it needs to be put into the exception level it had when it first entered the kernel. I have my arm64 kernel patches here: https://git.kernel.org/cgit/linux/kernel/git/geoff/linux-kexec.git The patches related to CPU reset are: arm64: Convert hcalls to use ISS field arm64: Add new hcall HVC_CALL_FUNC arm64: Add EL2 switch to soft_restart -Geoff _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
