On Thu, Nov 06, 2014 at 04:13:04PM +0000, Arun Chandran wrote: > On Thu, Nov 6, 2014 at 8:58 PM, Mark Rutland <mark.rutland at arm.com> wrote: > > On Thu, Nov 06, 2014 at 12:16:12PM +0000, Arun Chandran wrote: > >> Hi Geoff, > >> > >> I am trying this on my hardware (apm-mustang.dtb) > >> > >> On Fri, Oct 24, 2014 at 4:40 AM, Geoff Levand <geoff at infradead.org> wrote: > >> > Hi All, > >> > > >> > This series adds the core support for kexec re-boots on arm64. I have tested > >> > with the ARM VE fast model, the ARM Base model and the ARM Foundation > >> > model with various kernel config options for both the first and second stage > >> > kernels. > >> > > >> > To load a second stage kernel and execute a kexec re-boot on arm64 my patches to > >> > kexec-tools [2], which have not yet been merged upstream, are needed. > >> > > >> > Patches 1-4 rework the arm64 hcall mechanism to give the arm64 soft_restart() > >> > routine the ability to switch exception levels from EL1 to EL2 for kernels that > >> > were entered in EL2. > >> > > >> > Patches 5 and 6 convert the use of device tree /memreserve/ to device tree > >> > reserved-memory nodes. > >> > > >> > Patch 7 moves proc-macros.S from arm64/mm to arm64/include/asm so that the > >> > dcache_line_size macro it defines can be uesd by kexec's relocate kernel > >> > routine. > >> > > >> > Patches 8-10 add the actual kexec support. > >> > > >> > Please consider all patches for inclusion. Any comments or suggestions on how > >> > to improve are welcome. > >> > > >> > [1] https://git.linaro.org/people/geoff.levand/linux-kexec.git > >> > [2] https://git.linaro.org/people/geoff.levand/kexec-tools.git > >> > > >> > Several things are known to have problems on kexec re-boot: > >> > > >> > spin-table > >> > ---------- > >> > > >> > PROBLEM: The spin-table enable method does not implement all the methods needed > >> > for CPU hot-plug, so the first stage kernel cannot be shutdown properly. > >> > > >> > WORK-AROUND: Upgrade to system firmware that provides PSCI enable method > >> > support, OR build the first stage kernel with CONFIG_SMP=n, OR pass 'maxcpus=1' > >> > on the first stage kernel command line. > >> > >> I have CONFIG_SMP=n > >> > >> > > >> > FIX: Upgrade system firmware to provide PSCI enable method support. > >> > > >> > KVM > >> > --- > >> > > >> > PROBLEM: KVM acquires hypervisor resources on startup, but does not free those > >> > resources on shutdown, so the first stage kernel cannot be shutdown properly. > >> > > >> > WORK-AROUND: Build the first stage kernel with CONFIG_KVM=n. > >> > >> KVM also disabled. > >> > >> /root at genericarmv8:~# usr/local/sbin/kexec --lite -l vmlinux > >> --dtb=apm-mustang.dtb --command-line= > >> "root=/dev/nfs rw > >> nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 > >> ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 > >> earlyprintk=uart8250-32bit,0x1c020000" > >> > >> kexec version: 14.10.21.16.36-ga38e0a6 > >> arch_process_options:85: command_line: root=/dev/nfs rw > >> nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 > >> ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 > >> earlyprintk=uart8250-32bit,0x1 > >> c020000 > >> arch_process_options:87: initrd: (null) > >> arch_process_options:88: dtb: apm-mustang.dtb > >> arch_process_options:89: lite: 1 > >> kernel: 0x7f756e7010 kernel_size: 0x488a308 > >> Modified cmdline: root=/dev/nfs > >> Unable to find /proc/device-tree//chosen/linux,stdout-path, printing > >> from purgatory is diabled > >> get_memory_ranges_dt:638: node_1516 memory > >> get_memory_ranges_dt:664: RAM: 0000004000000000 - 0000004400000000 Does this look correct to you? That doesn't match what I see in apm-mustang.dts in mainline (where memory starts at 0x1_00000000). > >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 > >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 > >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 This looks suspicious, but I haven't investigated the underlying code. > >> get_memory_ranges_dt:678: Success > >> elf_arm64_load: PE format: yes > >> p_vaddr: ffffffc000080000 > >> virt_to_phys: ffffffc000080000 -> 0000004000080000 > >> add_segment_phys_virt: 0000007f756f7010 - 0000007f75d3cf70 (00645f60) > >> -> 0000004000080000 - 00000040006fb000 (0067b000) > >> elf_arm64_load: text_offset: 0000000000080000 > >> elf_arm64_load: image_size: 000000000067f000 > >> elf_arm64_load: page_offset: ffffffc000000000 > >> elf_arm64_load: memstart: 0000004000000000 > >> virt_to_phys: ffffffc000080000 -> 0000004000080000 > >> elf_arm64_load: e_entry: ffffffc000080000 -> 0000004000080000 > >> virt_to_phys: ffffffc000080000 -> 0000004000080000 So we'll load the kernel at this address... [...] > root at genericarmv8:~# /usr/local/sbin/kexec --lite -e > kexec version: 14.10.21.16.36-ga38e0a6 > arch_process_options:85: command_line: (null) > arch_process_options:87: initrd: (null) > arch_process_options:88: dtb: (null) > arch_process_options:89: lite: 1 > sd 0:0:0:0: [sda] Synchronizing SCSI cache > kexec: Starting new kernel > Bye! > Initializing cgroup subsys cpu > Linux version 3.17.0-rc4+ (arun at arun-OptiPlex-9010) (gcc version 4.9.1 > 20140505 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.05 - Linaro > GCC 4.9-2014.05) ) #12 PREEMPT Thu Nov 6 21:38:03 IST 2014 > CPU: AArch64 Processor [500f0000] revision 0 > Detected PIPT I-cache on CPU0 > Ignoring memory block 0x100000000 - 0x180000000 ... then the kernel finds the single memory region described in apm-mustang.dts which happens to be below PHYS_OFFSET for your board. So the kernel ignores it because it cannot address it ... > Early serial console at MMIO32 0x1c020000 (options '') > bootconsole [uart0] enabled > efi: Getting EFI parameters from FDT: > efi: UEFI not found. > cma: Failed to reserve 16 MiB > Kernel panic - not syncing: ERROR: Failed to allocate 0x1000 bytes below 0x0. ... and then explodes because it knows of no memory outside of the kernel Image. Mark.
