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KVM: PPC: Book3S HV: Implement real mode H_PAGE_INIT handler

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Implement a real mode handler for the H_CALL H_PAGE_INIT which can be
used to zero or copy a guest page. The page is defined to be 4k and must
be 4k aligned.

The in-kernel real mode handler halves the time to handle this H_CALL
compared to handling it in userspace for a hash guest.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Suraj Jitindar Singh
2019-03-22 17:05:45 +11:00
committed by Paul Mackerras
parent 2d34d1c3bb
commit eadfb1c5f8
3 changed files with 147 additions and 1 deletions
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2
arch/powerpc/include/asm/kvm_ppc.h
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@@ -665,6 +665,8 @@ long kvmppc_h_clear_ref(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long pte_index);
long kvmppc_h_clear_mod(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long pte_index);
long kvmppc_rm_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long dest, unsigned long src);
long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
unsigned long slb_v, unsigned int status, bool data);
unsigned long kvmppc_rm_h_xirr(struct kvm_vcpu *vcpu);