[RFC PATCH v3 06/19] KVM: x86: mmu: add gfn_in_memslot helper

From: Maxim Levitsky <mlevitsk@redhat.com>
To: kvm@vger.kernel.org
Cc: Wanpeng Li <wanpengli@tencent.com>,
	David Airlie <airlied@linux.ie>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	dri-devel@lists.freedesktop.org, "H. Peter Anvin" <hpa@zytor.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Joerg Roedel <joro@8bytes.org>,
	x86@kernel.org, Maxim Levitsky <mlevitsk@redhat.com>,
	Ingo Molnar <mingo@redhat.com>, Zhi Wang <zhi.a.wang@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	intel-gfx@lists.freedesktop.org, Borislav Petkov <bp@alien8.de>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	intel-gvt-dev@lists.freedesktop.org,
	Jim Mattson <jmattson@google.com>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	Sean Christopherson <seanjc@google.com>,
	linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: [RFC PATCH v3 06/19] KVM: x86: mmu: add gfn_in_memslot helper
Date: Wed, 27 Apr 2022 23:03:01 +0300	[thread overview]
Message-ID: <20220427200314.276673-7-mlevitsk@redhat.com> (raw)
In-Reply-To: <20220427200314.276673-1-mlevitsk@redhat.com>

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@redhat.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 252ee4a61b58b..12e261559070b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1580,6 +1580,13 @@ 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.
@@ -1590,12 +1597,13 @@ 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

