linux-kernel - [RFC PATCH 05/10] KVM: x86/mmu: make page_fault_handle_page

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Date:   Tue, 20 Apr 2021 03:39:15 -0700
From:   Isaku Yamahata <isaku.yamahata@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     isaku.yamahata@...il.com, Isaku Yamahata <isaku.yamahata@...el.com>
Subject: [RFC PATCH 05/10] KVM: x86/mmu: make page_fault_handle_page_track() receive single argument

Convert page_fault_handle_page_trace() to receive single argument,
struct kvm_page_fault, instead of many arguments.

No functional change is intended.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/mmu/mmu.c         | 9 +++++----
 arch/x86/kvm/mmu/paging_tmpl.h | 4 ++--
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index a2422bd9f59b..dac022a79c57 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3598,9 +3598,10 @@ static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct)
 	return RET_PF_RETRY;
 }
 
-static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
-					 u32 error_code, gfn_t gfn)
+static bool page_fault_handle_page_track(struct kvm_page_fault *kpf)
 {
+	u32 error_code = kpf->error_code;
+
 	if (unlikely(error_code & PFERR_RSVD_MASK))
 		return false;
 
@@ -3612,7 +3613,7 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
 	 * guest is writing the page which is write tracked which can
 	 * not be fixed by page fault handler.
 	 */
-	if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+	if (kvm_page_track_is_active(kpf->vcpu, kpf->gfn, KVM_PAGE_TRACK_WRITE))
 		return true;
 
 	return false;
@@ -3697,7 +3698,7 @@ static int direct_page_fault(struct kvm_page_fault *kpf)
 	unsigned long mmu_seq;
 	int r;
 
-	if (page_fault_handle_page_track(vcpu, error_code, gfn))
+	if (page_fault_handle_page_track(kpf))
 		return RET_PF_EMULATE;
 
 	if (!is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa)) {
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index f2beb7f7c378..7965786418af 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -827,7 +827,8 @@ static int FNAME(page_fault)(struct kvm_page_fault *kpf)
 		return RET_PF_RETRY;
 	}
 
-	if (page_fault_handle_page_track(vcpu, error_code, walker.gfn)) {
+	kpf->gfn = walker.gfn;
+	if (page_fault_handle_page_track(kpf)) {
 		shadow_page_table_clear_flood(vcpu, addr);
 		return RET_PF_EMULATE;
 	}
@@ -849,7 +850,6 @@ static int FNAME(page_fault)(struct kvm_page_fault *kpf)
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
 
-	kpf->gfn = walker.gfn;
 	if (try_async_pf(kpf))
 		return RET_PF_RETRY;
 
-- 
2.25.1