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bokdeuk-jeong avatar bokdeuk-jeong commented on July 20, 2024

[ GIC ITS command buffer access violation ]
How to reproduce: run qemu with -smp 4

KVM error message

[  709.354329] Unable to handle kernel unknown 40 at virtual address 0000007f6ca30000
[  709.354520] Mem abort info:
[  709.354610]   ESR = 0x96000028
[  709.354717]   EC = 0x25: DABT (current EL), IL = 32 bits
[  709.354859]   SET = 0, FnV = 0
[  709.354970]   EA = 0, S1PTW = 0
[  709.355071]   FSC = 0x28: unknown 40
[  709.355190] Data abort info:
[  709.355281]   ISV = 0, ISS = 0x00000028
[  709.355390]   CM = 0, WnR = 0
[  709.355500] user pgtable: 4k pages, 39-bit VAs, pgdp=000000088256c000
[  709.355669] [0000007f6ca30000] pgd=0800000880e96003, p4d=0800000880e96003, pud=0800000880e96003, pmd=08000008803b6003, pte=00e8000887398f43
[  709.356059] Internal error: Oops: 96000028 [#1] PREEMPT SMP
[  709.356209] Modules linked in:
[  709.356320] CPU: 2 PID: 534 Comm: qemu-system-aar Not tainted 5.17.0-g04b710f9aaec-dirty #10
[  709.356549] Hardware name: FVP Base RevC (DT)
[  709.356674] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  709.356880] pc : __arch_copy_from_user+0x94/0x230
[  709.357050] lr : __kvm_read_guest_page+0x70/0xa0
[  709.357209] sp : ffffffc00a463740
....
[  709.359810] Call trace:
[  709.359900]  __arch_copy_from_user+0x94/0x230
[  709.360069]  kvm_read_guest+0x6c/0xa4
[  709.360220]  vgic_its_process_commands.part.0+0xa8/0x970
[  709.360403]  vgic_mmio_write_its_cwriter+0x80/0xa4
[  709.360576]  dispatch_mmio_write+0xd0/0x130
[  709.360750]  __kvm_io_bus_write+0xb4/0xf0
[  709.360909]  kvm_io_bus_write+0x48/0x80
[  709.361059]  io_mem_abort+0x134/0x24c
[  709.361209]  kvm_handle_guest_abort+0x478/0xb20
[  709.361369]  handle_exit+0x70/0x180
[  709.361531]  kvm_arch_vcpu_ioctl_run+0x1c4/0x5e0
[  709.361690]  kvm_vcpu_ioctl+0x23c/0x950
[  709.361849]  __arm64_sys_ioctl+0xa8/0xec
[  709.362010]  invoke_syscall+0x48/0x114
[  709.362170]  el0_svc_common.constprop.0+0x44/0xec
[  709.362350]  do_el0_svc+0x24/0x84
[  709.362499]  el0_svc+0x2c/0x84
[  709.362660]  el0t_64_sync_handler+0x1a4/0x1b0
[  709.362832]  el0t_64_sync+0x18c/0x190
[  709.363009] Code: f8400827 f8408828 91004021 a88120c7 (f8400827)
...
[  709.363170] ---[ end trace 0000000000000000 ]---

Reason: Current implementation of RMM delegates all physical memory pages accessed by a realm to the realm via PAS update in GPT. No mechanism for specifying shared memory between RS(realm state) and NS(non-secure state).

Realm Linux kernel allocates a memory page for a GIC ITS command buffer and shares it with KVM in normal world.
Once it is touches(i.e. access) at realm before the gic emulator in KVM accesses the buffer, RMM maps IPA-PA according to the VMMapMemory RMI request from (our modified) KVM and updates GPT so that the page granule belongs to the realm.

work-around: 7a0918e
ultimate-solution(to-do): define interface for sharing memory between NS and RS.

(Once fixing this issue with smp 4, lots of GPT translation error messages are reported but we ignore the error for now.)

from islet.

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