linux-kernel - [PATCH v3 05/11] KVM: x86: mmu: add gfn_in

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Date:   Tue,  1 Mar 2022 20:26:33 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        x86@...nel.org, intel-gvt-dev@...ts.freedesktop.org,
        Joerg Roedel <joro@...tes.org>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel@...ts.freedesktop.org,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v3 05/11] KVM: x86: mmu: add gfn_in_memslot helper

This is a tiny refactoring, and can be useful to check
if a GPA/GFN is within a memslot a bit more cleanly.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 include/linux/kvm_host.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f11039944c08f..c32bfe0e22b80 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1574,6 +1574,13 @@ int kvm_request_irq_source_id(struct kvm *kvm);
 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
 
+
+static inline bool gfn_in_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+	return (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages);
+}
+
+
 /*
  * Returns a pointer to the memslot if it contains gfn.
  * Otherwise returns NULL.
@@ -1584,12 +1591,13 @@ try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 	if (!slot)
 		return NULL;
 
-	if (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages)
+	if (gfn_in_memslot(slot, gfn))
 		return slot;
 	else
 		return NULL;
 }
 
+
 /*
  * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
  *
-- 
2.26.3