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From: Jon Kohler <jon@nutanix.com>
To: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
	x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Jon Kohler <jon@nutanix.com>
Subject: [RFC PATCH 18/18] KVM: x86: Enable module parameter for MBEC
Date: Thu, 13 Mar 2025 13:36:57 -0700	[thread overview]
Message-ID: <20250313203702.575156-19-jon@nutanix.com> (raw)
In-Reply-To: <20250313203702.575156-1-jon@nutanix.com>

Enable 'enable_pt_guest_exec_control', which will allow user space to
control enablement of Intel MBEC by advertising secondary exec control
bit 22 to a given vCPU.

Signed-off-by: Jon Kohler <jon@nutanix.com>

---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4b2fbb9088ea..607ed2142ce8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -197,7 +197,7 @@ module_param(eager_page_split, bool, 0644);
 static bool __read_mostly mitigate_smt_rsb;
 module_param(mitigate_smt_rsb, bool, 0444);
 
-bool __read_mostly enable_pt_guest_exec_control;
+bool __read_mostly enable_pt_guest_exec_control = true;
 EXPORT_SYMBOL_GPL(enable_pt_guest_exec_control);
 module_param(enable_pt_guest_exec_control, bool, 0444);
 
-- 
2.43.0


  parent reply	other threads:[~2025-03-13 20:11 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-13 20:36 [RFC PATCH 00/18] KVM: VMX: Introduce Intel Mode-Based Execute Control (MBEC) Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 01/18] KVM: VMX: Remove EPT_VIOLATIONS_ACC_*_BIT defines Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 02/18] KVM: nVMX: Decouple EPT RWX bits from EPT Violation protection bits Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 03/18] KVM: x86: Add module parameter for Intel MBEC Jon Kohler
2025-05-12 18:08   ` Sean Christopherson
2025-05-13  2:18     ` Jon Kohler
2025-05-13  7:57       ` Shah, Amit
2025-12-23  4:15       ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 04/18] KVM: VMX: add cpu_has_vmx_mbec helper Jon Kohler
2025-05-12 18:14   ` Sean Christopherson
2025-05-13  2:17     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 05/18] KVM: x86: Add pt_guest_exec_control to kvm_vcpu_arch Jon Kohler
2025-04-22  6:27   ` Chao Gao
2025-05-12 18:15   ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 06/18] KVM: VMX: Wire up Intel MBEC enable/disable logic Jon Kohler
2025-04-22  7:06   ` Chao Gao
2025-05-12 18:23   ` Sean Christopherson
2025-05-13  2:16     ` Jon Kohler
2025-05-13 13:28       ` Sean Christopherson
2025-05-14 11:14         ` Shah, Amit
2025-05-14 12:55           ` Sean Christopherson
2025-06-16  9:27             ` Shah, Amit
2025-06-17 14:13               ` Sean Christopherson
2025-07-09 13:40                 ` Shah, Amit
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 07/18] KVM: VMX: Define VMX_EPT_USER_EXECUTABLE_MASK Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 08/18] KVM: x86/mmu: Remove SPTE_PERM_MASK Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 09/18] KVM: x86/mmu: Extend access bitfield in kvm_mmu_page_role Jon Kohler
2025-05-12 18:32   ` Sean Christopherson
2025-05-13  2:14     ` Jon Kohler
2025-12-23  4:15       ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 10/18] KVM: VMX: Extend EPT Violation protection bits Jon Kohler
2025-05-12 18:37   ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 11/18] KVM: VMX: Enhance EPT violation handler for PROT_USER_EXEC Jon Kohler
2025-05-12 18:54   ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 12/18] KVM: x86/mmu: Introduce shadow_ux_mask Jon Kohler
2025-04-23  3:06   ` Chao Gao
2025-05-12 19:13   ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 13/18] KVM: x86/mmu: Adjust SPTE_MMIO_ALLOWED_MASK to understand MBEC Jon Kohler
2025-04-23  5:37   ` Chao Gao
2025-05-12 19:37   ` Sean Christopherson
2025-05-13  2:11     ` Jon Kohler
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 14/18] KVM: x86/mmu: Extend is_executable_pte " Jon Kohler
2025-04-23  6:16   ` Chao Gao
2025-05-12 21:16   ` Sean Christopherson
2025-05-13  2:09     ` Jon Kohler
2025-12-23  4:15       ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 15/18] KVM: x86/mmu: Extend make_spte " Jon Kohler
2025-05-12 21:29   ` Sean Christopherson
2025-05-13  2:04     ` Jon Kohler
2025-05-13 17:54       ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 16/18] KVM: nVMX: Setup Intel MBEC in nested secondary controls Jon Kohler
2025-05-12 21:32   ` Sean Christopherson
2025-12-23  4:15     ` Jon Kohler
2025-03-13 20:36 ` [RFC PATCH 17/18] KVM: VMX: Allow MBEC with EVMCS Jon Kohler
2025-05-12 21:35   ` Sean Christopherson
2025-05-13  2:01     ` Jon Kohler
2025-12-23  4:16       ` Jon Kohler
2025-03-13 20:36 ` Jon Kohler [this message]
2025-04-15  9:29 ` [RFC PATCH 00/18] KVM: VMX: Introduce Intel Mode-Based Execute Control (MBEC) Mickaël Salaün
2025-04-15 14:43   ` Sean Christopherson
2025-05-12 15:26     ` Jon Kohler
2025-04-15 14:43   ` Jon Kohler
2025-04-16 15:44     ` Mickaël Salaün
2025-04-23 13:54 ` Adrian-Ken Rueegsegger
2025-05-12 15:26   ` Jon Kohler
2025-05-12 21:46 ` Sean Christopherson
2025-05-13  1:59   ` Jon Kohler
2025-12-23  4:17   ` Jon Kohler

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