On 8/8/24 9:48 AM, Salil Mehta wrote:
However, I'm unable to hot-add a vCPU and haven't get a chance to look
at it closely.
(qemu) device_add host-arm-cpu,id=cpu,socket-id=1
(qemu) [ 258.901027] Unable to handle kernel write to read-only memory at
virtual address ffff800080fa7190
[ 258.901686] Mem abort info:
[ 258.901889] ESR = 0x000000009600004e
[ 258.902160] EC = 0x25: DABT (current EL), IL = 32 bits
[ 258.902543] SET = 0, FnV = 0
[ 258.902763] EA = 0, S1PTW = 0
[ 258.902991] FSC = 0x0e: level 2 permission fault
[ 258.903338] Data abort info:
[ 258.903547] ISV = 0, ISS = 0x0000004e, ISS2 = 0x00000000
[ 258.903943] CM = 0, WnR = 1, TnD = 0, TagAccess = 0
[ 258.904304] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 258.904687] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000b8e24000
[ 258.905258] [ffff800080fa7190] pgd=10000000b95b0003, p4d=10000000b95b0003,
pud=10000000b95b1003, pmd=00600000b8c00781
[ 258.906026] Internal error: Oops: 000000009600004e [#1] PREEMPT SMP
[ 258.906474] Modules linked in:
[ 258.906705] CPU: 0 UID: 0 PID: 29 Comm: kworker/u8:1 Not tainted
6.11.0-rc2-gavin-gb446a2dae984 #7
[ 258.907338] Hardware name: QEMU KVM Virtual Machine, BIOS
edk2-stable202402-prebuilt.qemu.org 02/14/2024
[ 258.908009] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[ 258.908401] pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
[ 258.908899] pc : register_cpu+0x140/0x290
[ 258.909195] lr : register_cpu+0x128/0x290
[ 258.909487] sp : ffff8000817fba10
[ 258.909727] x29: ffff8000817fba10 x28: 0000000000000000 x27: ffff0000011f9098
[ 258.910246] x26: ffff80008167b1b0 x25: 0000000000000001 x24: ffff80008153dad0
[ 258.910762] x23: 0000000000000001 x22: ffff0000ff7de210 x21: ffff8000811b9a00
[ 258.911279] x20: 0000000000000000 x19: ffff800080fa7190 x18: ffffffffffffffff
[ 258.911798] x17: 0000000000000000 x16: 0000000000000000 x15: ffff000005a46a1c
[ 258.912326] x14: ffffffffffffffff x13: ffff000005a4632b x12: 0000000000000000
[ 258.912854] x11: 0000000000000040 x10: 0000000000000000 x9 : ffff8000808a6cd4
[ 258.913382] x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : fefefefefefefeff
[ 258.913906] x5 : ffff0000053fab40 x4 : ffff0000053fa920 x3 : ffff0000053fabb0
[ 258.914439] x2 : ffff000000de1100 x1 : ffff800080fa7190 x0 : 0000000000000002
[ 258.914968] Call trace:
[ 258.915154] register_cpu+0x140/0x290
[ 258.915429] arch_register_cpu+0x84/0xd8
[ 258.915726] acpi_processor_add+0x480/0x5b0
[ 258.916042] acpi_bus_attach+0x1c4/0x300
[ 258.916334] acpi_dev_for_one_check+0x3c/0x50
[ 258.916689] device_for_each_child+0x68/0xc8
[ 258.917012] acpi_dev_for_each_child+0x48/0x80
[ 258.917344] acpi_bus_attach+0x84/0x300
[ 258.917629] acpi_bus_scan+0x74/0x220
[ 258.917902] acpi_scan_rescan_bus+0x54/0x88
[ 258.918211] acpi_device_hotplug+0x208/0x478
[ 258.918529] acpi_hotplug_work_fn+0x2c/0x50
[ 258.918839] process_one_work+0x15c/0x3c0
[ 258.919139] worker_thread+0x2ec/0x400
[ 258.919417] kthread+0x120/0x130
[ 258.919658] ret_from_fork+0x10/0x20
[ 258.919924] Code: 91064021 9ad72000 8b130c33 d503201f (f820327f)
[ 258.920373] ---[ end trace 0000000000000000 ]---