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From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Marc Zyngier <maz@kernel.org>, Paolo Bonzini <pbonzini@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>
Cc:     James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
        linux-mips@vger.kernel.org, kvm@vger.kernel.org,
        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        Ben Gardon <bgardon@google.com>,
        Peter Feiner <pfeiner@google.com>,
        Peter Shier <pshier@google.com>,
        Junaid Shahid <junaids@google.com>,
        Christoffer Dall <christoffer.dall@arm.com>
Subject: [PATCH v3 06/21] KVM: x86/mmu: Move fast_page_fault() call above mmu_topup_memory_caches()
Date:   Thu,  2 Jul 2020 19:35:30 -0700
Message-Id: <20200703023545.8771-7-sean.j.christopherson@intel.com>
In-Reply-To: <20200703023545.8771-1-sean.j.christopherson@intel.com>
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Avoid refilling the memory caches and potentially slow reclaim/swap when
handling a fast page fault, which does not need to allocate any new
objects.

Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/mmu/mmu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 748235877def..3d0768e16463 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4095,6 +4095,9 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 	if (page_fault_handle_page_track(vcpu, error_code, gfn))
 		return RET_PF_EMULATE;
 
+	if (fast_page_fault(vcpu, gpa, error_code))
+		return RET_PF_RETRY;
+
 	r = mmu_topup_memory_caches(vcpu);
 	if (r)
 		return r;
@@ -4102,9 +4105,6 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 	if (lpage_disallowed)
 		max_level = PG_LEVEL_4K;
 
-	if (fast_page_fault(vcpu, gpa, error_code))
-		return RET_PF_RETRY;
-
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
 
-- 
2.26.0