KVM: nVMX: Use kvm_{read,write}_guest_cached() for shadow_vmcs12

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Using kvm_vcpu_map() for reading from the guest is entirely gratuitous,
when all we do is a single memcpy and unmap it again. Fix it up to use
kvm_read_guest()... but in fact I couldn't bring myself to do that
without also making it use a gfn_to_hva_cache for both that *and* the
copy in the other direction.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20211115165030.7422-5-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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David Woodhouse 2021-11-15 16:50:24 +00:00 • committed by Paolo Bonzini

parent 4e8436479a

commit 297d597a6d

2 changed files with 20 additions and 9 deletions

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24

arch/x86/kvm/vmx/nested.c

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5

arch/x86/kvm/vmx/vmx.h

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