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KVM: PPC: Book3S HV P9: Use kvm_arch_vcpu_get_wait() to get rcuwait object

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Use kvm_arch_vcpu_get_wait() to get a vCPU's rcuwait object instead of
using vcpu->wait directly in kvmhv_run_single_vcpu().  Functionally, this
is a nop as vcpu->arch.waitp is guaranteed to point at vcpu->wait.  But
that is not obvious at first glance, and a future change coming in via
the KVM tree, commit 510958e997 ("KVM: Force PPC to define its own
rcuwait object"), will hide vcpu->wait from architectures that define
__KVM_HAVE_ARCH_WQP to prevent generic KVM from attepting to wake a vCPU
with the wrong rcuwait object.

Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211213174556.3871157-1-seanjc@google.com
This commit is contained in:
Sean Christopherson 2021-12-13 17:45:56 +00:00 committed by Michael Ellerman
parent 792020907b
commit 63fa47ba88
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/kvm/book3s_hv.c
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@ -4442,6 +4442,7 @@ static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu)
int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
struct kvm_run *run = vcpu->run;
int trap, r, pcpu;
int srcu_idx;
@ -4588,7 +4589,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) {
kvmppc_set_timer(vcpu);
prepare_to_rcuwait(&vcpu->wait);
prepare_to_rcuwait(wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (signal_pending(current)) {
@ -4605,7 +4606,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
schedule();
trace_kvmppc_vcore_blocked(vc, 1);
}
finish_rcuwait(&vcpu->wait);
finish_rcuwait(wait);
}
vcpu->arch.ceded = 0;