Commit ded58749 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Paolo Bonzini
Browse files

KVM: x86: MMU: Consolidate quickly_check_mmio_pf() and is_mmio_page_fault() 



These two have only slight differences:
 - whether 'addr' is of type u64 or of type gva_t
 - whether they have 'direct' parameter or not

Concerning the former, quickly_check_mmio_pf()'s u64 is better because
'addr' needs to be able to have both a guest physical address and a
guest virtual address.

The latter is just a stylistic issue as we can always calculate the mode
from the 'vcpu' as is_mmio_page_fault() does.  This patch keeps the
parameter to make the following patch cleaner.

In addition, the patch renames the function to mmio_info_in_cache() to
make it clear what it actually checks for.

Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3ae13faa

arch/x86/kvm/mmu.c

+4 −11
Original line number Diff line number Diff line
@@ -3273,7 +3273,7 @@ static bool is_shadow_zero_bits_set(struct kvm_mmu *mmu, u64 spte, int level) 
	return __is_rsvd_bits_set(&mmu->shadow_zero_check, spte, level);

}



static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct)

static bool mmio_info_in_cache(struct kvm_vcpu *vcpu, u64 addr, bool direct)

{

	if (direct)

		return vcpu_match_mmio_gpa(vcpu, addr);
@@ -3332,7 +3332,7 @@ int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct) 
	u64 spte;

	bool reserved;



	if (quickly_check_mmio_pf(vcpu, addr, direct))

	if (mmio_info_in_cache(vcpu, addr, direct))

		return RET_MMIO_PF_EMULATE;



	reserved = walk_shadow_page_get_mmio_spte(vcpu, addr, &spte);
@@ -4354,19 +4354,12 @@ static void make_mmu_pages_available(struct kvm_vcpu *vcpu) 
	kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);

}



static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr)

{

	if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu))

		return vcpu_match_mmio_gpa(vcpu, addr);



	return vcpu_match_mmio_gva(vcpu, addr);

}



int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code,

		       void *insn, int insn_len)

{

	int r, emulation_type = EMULTYPE_RETRY;

	enum emulation_result er;

	bool direct = vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu);



	r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false);

	if (r < 0)
@@ -4377,7 +4370,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, 
		goto out;

	}



	if (is_mmio_page_fault(vcpu, cr2))

	if (mmio_info_in_cache(vcpu, cr2, direct))

		emulation_type = 0;



	er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len);

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