Hello! > The issue is similar to what you have noticed.
In this case it's probably not your fault. > The larger the number of smp cores it is more likely that the boot will get > stuck. > I've commuted this patch series as an RFC because of this issue. I have tried to give more testing to it. Up to 4 CPUs worked okay (if we ignore "press any key" problem which i described). Starting from 5 i get a hard freeze right after " SMP: Total of N processors activated" message. However, i get this deadlock also with GICv2, so it's perhaps not your fault. The second problem is that i did not manage to bring up more than 8 CPUs. The following happens: --- cut --- Initializing cgroup subsys memory Initializing cgroup subsys hugetlb hw perfevents: no hardware support available EFI services will not be available. CPU1: Booted secondary processor Detected PIPT I-cache on CPU1 CPU1: found redistributor 1 region 0:0x0000000008060000 CPU2: Booted secondary processor Detected PIPT I-cache on CPU2 CPU2: found redistributor 2 region 0:0x0000000008080000 CPU3: Booted secondary processor Detected PIPT I-cache on CPU3 CPU3: found redistributor 3 region 0:0x00000000080a0000 CPU4: Booted secondary processor Detected PIPT I-cache on CPU4 CPU4: found redistributor 4 region 0:0x00000000080c0000 CPU5: Booted secondary processor Detected PIPT I-cache on CPU5 CPU5: found redistributor 5 region 0:0x00000000080e0000 CPU6: Booted secondary processor Detected PIPT I-cache on CPU6 CPU6: found redistributor 6 region 0:0x0000000008100000 CPU7: Booted secondary processor Detected PIPT I-cache on CPU7 CPU7: found redistributor 7 region 0:0x0000000008120000 psci: failed to boot CPU8 (-22) CPU8: failed to boot: -22 psci: failed to boot CPU9 (-22) CPU9: failed to boot: -22 psci: failed to boot CPU10 (-22) CPU10: failed to boot: -22 psci: failed to boot CPU11 (-22) CPU11: failed to boot: -22 psci: failed to boot CPU12 (-22) CPU12: failed to boot: -22 psci: failed to boot CPU13 (-22) CPU13: failed to boot: -22 psci: failed to boot CPU14 (-22) CPU14: failed to boot: -22 psci: failed to boot CPU15 (-22) CPU15: failed to boot: -22 Brought up 8 CPUs SMP: Total of 8 processors activated. --- cut --- But, perhaps it's the fault of my code (i replaced your patch No 4 with my own implementation, merging the code). I will post this alternative version soon if you don't mind (need to rebase it on master). My current guest kernel is v3.19.5. I will test on 4.1rc2 soon. Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia
