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KVM: Don't WARN if kvm_pfn_to_page() encounters a "reserved" pfn

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Drop a WARN_ON() if kvm_pfn_to_page() encounters a "reserved" pfn, which
in this context means a struct page that has PG_reserved but is not a/the
ZERO_PAGE and is not a ZONE_DEVICE page.  The usage, via gfn_to_page(),
in x86 is safe as gfn_to_page() is used only to retrieve a page from
KVM-controlled memslot, but the usage in PPC and s390 operates on
arbitrary gfns and thus memslots that can be backed by incompatible
memory.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220429010416.2788472-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-04-29 01:04:12 +00:00 committed by Paolo Bonzini
parent fe1911aa44
commit 6573a6910c
1 changed files with 1 additions and 3 deletions
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4
virt/kvm/kvm_main.c
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@ -2725,10 +2725,8 @@ static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
if (is_error_noslot_pfn(pfn))
return KVM_ERR_PTR_BAD_PAGE;
if (kvm_is_reserved_pfn(pfn)) {
WARN_ON(1);
if (kvm_is_reserved_pfn(pfn))
return KVM_ERR_PTR_BAD_PAGE;
}
return pfn_to_page(pfn);
}