On Tue, 2024-03-19 at 17:15 -0700, Sean Christopherson wrote: > Explicit disallow activating a gfn_to_pfn_cache with an error gpa, i.e. > INVALID_GPA, to ensure that KVM doesn't mistake a GPA-based cache for an > HVA-based cache (KVM uses INVALID_GPA as a magic value to differentiate > between GPA-based and HVA-based caches). > > WARN if KVM attempts to activate a cache with INVALID_GPA, purely so that > new caches need to at least consider what to do with a "bad" GPA, as all > existing usage of kvm_gpc_activate() guarantees gpa != INVALID_GPA. I.e. > removing the WARN in the future is completely reasonable if doing so would > yield cleaner/better code overall. > > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
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