[Bug 210695] error: kvm run failed Invalid argument

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=210695

--- Comment #2 from Richard Herbert (rherbert@sympatico.ca) ---
Hi, Sean.  I'm no programmer, unfortunately, but when kernel 5.10-rc4 was
released, this was the patch that I suspected had fixed the problem.  I don't
find this code is 5.10.1, so it must have been reverted or moved.

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 27e381c9da6c2..ff28a5c6abd63 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -49,7 +49,14 @@ bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa)
 {
        struct kvm_mmu_page *sp;

+       if (!kvm->arch.tdp_mmu_enabled)
+               return false;
+       if (WARN_ON(!VALID_PAGE(hpa)))
+               return false;
+
        sp = to_shadow_page(hpa);
+       if (WARN_ON(!sp))
+               return false;

        return sp->tdp_mmu_page && sp->root_count;
 }

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