diff options
author | Sean Christopherson <seanjc@google.com> | 2022-04-15 03:43:43 +0300 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-21 20:16:11 +0300 |
commit | 2031f2876896d82aca7e82f84accd9181b9587fb (patch) | |
tree | 3738b7477aeb1e7436fa3a01a0a3ff63d0266952 /arch/riscv/kvm/vcpu_exit.c | |
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 'arch/riscv/kvm/vcpu_exit.c')
-rw-r--r-- | arch/riscv/kvm/vcpu_exit.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index 2d56faddb9d1..a72c15d4b42a 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -456,9 +456,9 @@ static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run, void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu) { if (!kvm_arch_vcpu_runnable(vcpu)) { - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); + kvm_vcpu_srcu_read_unlock(vcpu); kvm_vcpu_halt(vcpu); - vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + kvm_vcpu_srcu_read_lock(vcpu); kvm_clear_request(KVM_REQ_UNHALT, vcpu); } } |