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| author | Sean Christopherson <[email protected]> | 2025-01-24 23:46:23 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2025-02-04 16:28:21 +0000 |
| commit | 43fb96ae78551d7bfa4ecca956b258f085d67c40 (patch) | |
| tree | dd25e2b2f3680be3e7743479b3f5caa748b10ec5 /arch/powerpc/lib/code-patching.c | |
| parent | KVM: remove kvm_arch_post_init_vm (diff) | |
| download | kernel-43fb96ae78551d7bfa4ecca956b258f085d67c40.tar.gz kernel-43fb96ae78551d7bfa4ecca956b258f085d67c40.zip | |
KVM: x86/mmu: Ensure NX huge page recovery thread is alive before waking
When waking a VM's NX huge page recovery thread, ensure the thread is
actually alive before trying to wake it. Now that the thread is spawned
on-demand during KVM_RUN, a VM without a recovery thread is reachable via
the related module params.
BUG: kernel NULL pointer dereference, address: 0000000000000040
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:vhost_task_wake+0x5/0x10
Call Trace:
<TASK>
set_nx_huge_pages+0xcc/0x1e0 [kvm]
param_attr_store+0x8a/0xd0
module_attr_store+0x1a/0x30
kernfs_fop_write_iter+0x12f/0x1e0
vfs_write+0x233/0x3e0
ksys_write+0x60/0xd0
do_syscall_64+0x5b/0x160
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7f3b52710104
</TASK>
Modules linked in: kvm_intel kvm
CR2: 0000000000000040
Fixes: 931656b9e2ff ("kvm: defer huge page recovery vhost task to later")
Cc: [email protected]
Cc: Keith Busch <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
0 files changed, 0 insertions, 0 deletions