KVM: x86/mmu: Passing up the error state of mmu_alloc_shadow_roots()

commit c6c937d673aaa1d603f62f134e1ca9c173eeeed3 upstream.

Just like on the optional mmu_alloc_direct_roots() path, once shadow
path reaches "r = -EIO" somewhere, the caller needs to know the actual
state in order to enter error handling and avoid something worse.

Fixes: 4a38162ee9f1 ("KVM: MMU: load PDPTRs outside mmu_lock")
Signed-off-by: Like Xu <likexu@tencent.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220301124941.48412-1-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 84e23b9864f4c8d983b678b44da7489dcde7acb9..d70eee9e6716306714c37036a83538f285b8cc9f 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3573,7 +3573,7 @@ set_root_pgd:
 out_unlock:
        write_unlock(&vcpu->kvm->mmu_lock);
 
-       return 0;
+       return r;
 }
 
 static int mmu_alloc_special_roots(struct kvm_vcpu *vcpu)