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1e3a825c9e
During vCPU creation, a vCPU may be destroyed immediately after
kvm_arch_vcpu_create() (e.g., due to vCPU id confiliction). However, the
vcpu_load() inside kvm_arch_vcpu_create() may have associate the vCPU to
pCPU via "list_add(&tdx->cpu_list, &per_cpu(associated_tdvcpus, cpu))"
before invoking tdx_vcpu_free().
Though there's no need to invoke tdh_vp_flush() on the vCPU, failing to
dissociate the vCPU from pCPU (i.e., "list_del(&to_tdx(vcpu)->cpu_list)")
will cause list corruption of the per-pCPU list associated_tdvcpus.
Then, a later list_add() during vcpu_load() would detect list corruption
and print calltrace as shown below.
Dissociate a vCPU from its associated pCPU in tdx_vcpu_free() for the vCPUs
destroyed immediately after creation which must be in
VCPU_TD_STATE_UNINITIALIZED state.
kernel BUG at lib/list_debug.c:29!
Oops: invalid opcode: 0000 [#2] SMP NOPTI
RIP: 0010:__list_add_valid_or_report+0x82/0xd0
Call Trace:
<TASK>
tdx_vcpu_load+0xa8/0x120
vt_vcpu_load+0x25/0x30
kvm_arch_vcpu_load+0x81/0x300
vcpu_load+0x55/0x90
kvm_arch_vcpu_create+0x24f/0x330
kvm_vm_ioctl_create_vcpu+0x1b1/0x53
kvm_vm_ioctl+0xc2/0xa60
__x64_sys_ioctl+0x9a/0xf0
x64_sys_call+0x10ee/0x20d0
do_syscall_64+0xc3/0x470
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.