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From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Maxim Levitsky <mlevitsk@redhat.com>,
	"Maciej S . Szmigiero" <maciej.szmigiero@oracle.com>,
	Ben Gardon <bgardon@google.com>
Subject: [PATCH 1/3] KVM: x86/mmu: Drop a redundant, broken remote TLB flush
Date: Thu, 21 Oct 2021 18:00:03 -0700	[thread overview]
Message-ID: <20211022010005.1454978-2-seanjc@google.com> (raw)
In-Reply-To: <20211022010005.1454978-1-seanjc@google.com>

A recent commit to fix the calls to kvm_flush_remote_tlbs_with_address()
in kvm_zap_gfn_range() inadvertantly added yet another flush instead of
fixing the existing flush.  Drop the redundant flush, and fix the params
for the existing flush.

Fixes: 2822da446640 ("KVM: x86/mmu: fix parameters to kvm_flush_remote_tlbs_with_address")
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Cc: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/mmu/mmu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c6ddb042b281..f82b192bba0b 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5709,13 +5709,11 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
 		for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
 			flush = kvm_tdp_mmu_zap_gfn_range(kvm, i, gfn_start,
 							  gfn_end, flush);
-		if (flush)
-			kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
-							   gfn_end - gfn_start);
 	}
 
 	if (flush)
-		kvm_flush_remote_tlbs_with_address(kvm, gfn_start, gfn_end);
+		kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
+						   gfn_end - gfn_start);
 
 	kvm_dec_notifier_count(kvm, gfn_start, gfn_end);
 
-- 
2.33.0.1079.g6e70778dc9-goog


  reply	other threads:[~2021-10-22  1:00 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-22  1:00 [PATCH 0/3] KVM: x86/mmu: Clean up kvm_zap_gfn_range() Sean Christopherson
2021-10-22  1:00 ` Sean Christopherson [this message]
2021-10-22  2:58   ` [PATCH 1/3] KVM: x86/mmu: Drop a redundant, broken remote TLB flush Lai Jiangshan
2021-10-22  3:03     ` Lai Jiangshan
2021-10-22 15:39   ` Maxim Levitsky
2021-10-22  1:00 ` [PATCH 2/3] KVM: x86/mmu: Drop a redundant remote TLB flush in kvm_zap_gfn_range() Sean Christopherson
2021-10-22 11:44   ` Maciej S. Szmigiero
2021-10-25 15:39     ` Sean Christopherson
2021-10-26 14:22       ` Maciej S. Szmigiero
2021-10-22  1:00 ` [PATCH 3/3] KVM: x86/mmu: Extract zapping of rmaps for gfn range to separate helper Sean Christopherson
2021-10-22 15:11 ` [PATCH 0/3] KVM: x86/mmu: Clean up kvm_zap_gfn_range() Paolo Bonzini

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