Topup memory caches after walking the GVA->GPA translation during a
shadow page fault, there is no need to ensure the caches are full when
walking the GVA. As of commit
f5a1e9f89504f ("KVM: MMU: remove call
to kvm_mmu_pte_write from walk_addr"), the FNAME(walk_addr) flow no
longer add rmaps via kvm_mmu_pte_write().
This avoids allocating memory in the case that the GVA is unmapped in
the guest, and also provides a paper trail of why/when the memory caches
need to be filled.
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <
20200703023545.8771-8-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
- r = mmu_topup_memory_caches(vcpu);
- if (r)
- return r;
-
/*
* If PFEC.RSVD is set, this is a shadow page fault.
* The bit needs to be cleared before walking guest page tables.
return RET_PF_EMULATE;
}
+ r = mmu_topup_memory_caches(vcpu);
+ if (r)
+ return r;
+
vcpu->arch.write_fault_to_shadow_pgtable = false;
is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu,