linux-kernel - [PATCH] KVM: x86: enable TDP MMU by default

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Message-Id: <20210726163106.1433600-1-pbonzini@redhat.com>
Date:   Mon, 26 Jul 2021 12:31:06 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     bgardon@...gle.com
Subject: [PATCH] KVM: x86: enable TDP MMU by default

With the addition of fast page fault support, the TDP-specific MMU has reached
feature parity with the original MMU.  All my testing in the last few months
has been done with the TDP MMU; switch the default on 64-bit machines.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index f86158d41af0..43f12f5d12c0 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -10,7 +10,7 @@
 #include <asm/cmpxchg.h>
 #include <trace/events/kvm.h>
 
-static bool __read_mostly tdp_mmu_enabled = false;
+static bool __read_mostly tdp_mmu_enabled = true;
 module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644);
 
 /* Initializes the TDP MMU for the VM, if enabled. */
-- 
2.27.0