linux-kernel - [PATCH 5.16 186/186] KVM: x86/mmu: Passing up the error state of mmu_alloc_shadow

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Date:   Mon,  7 Mar 2022 10:20:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Like Xu <likexu@...cent.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 5.16 186/186] KVM: x86/mmu: Passing up the error state of mmu_alloc_shadow_roots()

From: Like Xu <likexu@...cent.com>

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@...cent.com>
Reviewed-by: Sean Christopherson <seanjc@...gle.com>
Message-Id: <20220301124941.48412-1-likexu@...cent.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/mmu/mmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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)