linux-kernel - [RFC PATCH 3/6] KVM: X86: Add arguement gfn and role to kvm_mmu_alloc

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Message-Id: <20211210092508.7185-4-jiangshanlai@gmail.com>
Date:   Fri, 10 Dec 2021 17:25:05 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [RFC PATCH 3/6] KVM: X86: Add arguement gfn and role to kvm_mmu_alloc_page()

From: Lai Jiangshan <laijs@...ux.alibaba.com>

kvm_mmu_alloc_page() will access to more bits of the role.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/kvm/mmu/mmu.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 846a2e426e0b..54e7cbc15380 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1734,13 +1734,13 @@ static void drop_parent_pte(struct kvm_mmu_page *sp,
 	mmu_spte_clear_no_track(parent_pte);
 }
 
-static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, int direct)
+static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, gfn_t gfn, union kvm_mmu_page_role role)
 {
 	struct kvm_mmu_page *sp;
 
 	sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache);
 	sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache);
-	if (!direct)
+	if (!role.direct)
 		sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
 	set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
 
@@ -1752,6 +1752,8 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, int direct
 	sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
 	list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
 	kvm_mod_used_mmu_pages(vcpu->kvm, +1);
+	sp->gfn = gfn;
+	sp->role = role;
 	return sp;
 }
 
@@ -2138,10 +2140,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 
 	++vcpu->kvm->stat.mmu_cache_miss;
 
-	sp = kvm_mmu_alloc_page(vcpu, direct);
-
-	sp->gfn = gfn;
-	sp->role = role;
+	sp = kvm_mmu_alloc_page(vcpu, gfn, role);
 	hlist_add_head(&sp->hash_link, sp_list);
 	if (!direct) {
 		account_shadowed(vcpu->kvm, sp);
-- 
2.19.1.6.gb485710b