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From: David Matlack <dmatlack@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Borislav Petkov <bp@suse.de>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Damien Le Moal <damien.lemoal@opensource.wdc.com>,
	kvm@vger.kernel.org, David Matlack <dmatlack@google.com>
Subject: [PATCH 6/9] KVM: x86/mmu: Stop needlessly making MMU pages available for TDP MMU faults
Date: Mon, 15 Aug 2022 16:01:07 -0700	[thread overview]
Message-ID: <20220815230110.2266741-7-dmatlack@google.com> (raw)
In-Reply-To: <20220815230110.2266741-1-dmatlack@google.com>

Stop calling make_mmu_pages_available() when handling TDP MMU faults.
The TDP MMU does not participate in the "available MMU pages" tracking
and limiting so calling this function is unnecessary work when handling
TDP MMU faults.

Signed-off-by: David Matlack <dmatlack@google.com>
---
 arch/x86/kvm/mmu/mmu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 182f9f417e4e..6613ae387e1b 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4345,10 +4345,6 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 	if (is_page_fault_stale(vcpu, fault))
 		goto out_unlock;
 
-	r = make_mmu_pages_available(vcpu);
-	if (r)
-		goto out_unlock;
-
 	r = kvm_tdp_mmu_map(vcpu, fault);
 
 out_unlock:
-- 
2.37.1.595.g718a3a8f04-goog


  parent reply	other threads:[~2022-08-16  5:54 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-15 23:01 [PATCH 0/9] KVM: x86/mmu: Always enable the TDP MMU when TDP is enabled David Matlack
2022-08-15 23:01 ` [PATCH 1/9] " David Matlack
2022-08-17 10:05   ` Paolo Bonzini
2022-08-17 16:49     ` David Matlack
2022-08-17 16:53       ` Paolo Bonzini
2022-08-17 17:46         ` David Matlack
2022-08-15 23:01 ` [PATCH 2/9] KVM: x86/mmu: Drop kvm->arch.tdp_mmu_enabled David Matlack
2022-08-17 11:38   ` kernel test robot
2022-08-24 14:21   ` kernel test robot
2022-08-15 23:01 ` [PATCH 3/9] KVM: x86/mmu: Consolidate mmu_seq calculations in kvm_faultin_pfn() David Matlack
2022-08-15 23:01 ` [PATCH 4/9] KVM: x86/mmu: Rename __direct_map() to nonpaging_map() David Matlack
2022-08-15 23:01 ` [PATCH 5/9] KVM: x86/mmu: Separate TDP and non-paging fault handling David Matlack
2022-08-24 17:06   ` kernel test robot
2022-08-15 23:01 ` David Matlack [this message]
2022-08-15 23:01 ` [PATCH 7/9] KVM: x86/mmu: Handle "error PFNs" in kvm_faultin_pfn() David Matlack
2022-08-15 23:01 ` [PATCH 8/9] KVM: x86/mmu: Avoid memslot lookup during KVM_PFN_ERR_HWPOISON handling David Matlack
2022-08-15 23:01 ` [PATCH 9/9] KVM: x86/mmu: Try to handle no-slot faults during kvm_faultin_pfn() David Matlack
2022-08-15 23:09   ` David Matlack
2022-08-16  8:16 ` [PATCH 0/9] KVM: x86/mmu: Always enable the TDP MMU when TDP is enabled Peter Zijlstra
2022-08-16 16:30   ` David Matlack
2022-08-17  8:53     ` Peter Zijlstra
2022-08-17 10:01     ` Huang, Kai
2022-08-17 16:42       ` David Matlack
2022-08-17 23:36         ` Huang, Kai
2022-08-16 22:54 ` David Matlack

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