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author | Sean Christopherson <seanjc@google.com> | 2022-04-15 03:43:43 +0300 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-21 20:16:11 +0300 |
commit | 2031f2876896d82aca7e82f84accd9181b9587fb (patch) | |
tree | 3738b7477aeb1e7436fa3a01a0a3ff63d0266952 /virt/kvm | |
parent | fdd6f6ac2e489b9b256cd05a880d13bfdbac7c2e (diff) | |
download | linux-2031f2876896d82aca7e82f84accd9181b9587fb.tar.xz |
KVM: Add helpers to wrap vcpu->srcu_idx and yell if it's abused
Add wrappers to acquire/release KVM's SRCU lock when stashing the index
in vcpu->src_idx, along with rudimentary detection of illegal usage,
e.g. re-acquiring SRCU and thus overwriting vcpu->src_idx. Because the
SRCU index is (currently) either 0 or 1, illegal nesting bugs can go
unnoticed for quite some time and only cause problems when the nested
lock happens to get a different index.
Wrap the WARNs in PROVE_RCU=y, and make them ONCE, otherwise KVM will
likely yell so loudly that it will bring the kernel to its knees.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Fabiano Rosas <farosas@linux.ibm.com>
Message-Id: <20220415004343.2203171-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
0 files changed, 0 insertions, 0 deletions