KVM: x86: Don't fault-in APIC access page during initial allocation

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Drop the gfn_to_page() lookup when installing KVM's internal memslot for
the APIC access page, as KVM doesn't need to immediately fault-in the page
now that the page isn't pinned.  In the extremely unlikely event the
kernel can't allocate a 4KiB page, KVM can just as easily return -EFAULT
on the future page fault.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-37-seanjc@google.com>

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Sean Christopherson 2024-10-10 11:23:38 -07:00 • committed by Paolo Bonzini

parent 68e51d0a43

commit fcd366b95e

1 changed files with 0 additions and 12 deletions

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arch/x86/kvm/lapic.c

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