linux-kernel - [PATCH 43/43] KVM: nVMX: shadow pin based execution controls

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Date:   Thu, 13 Jun 2019 19:03:29 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        vkuznets@...hat.com
Subject: [PATCH 43/43] KVM: nVMX: shadow pin based execution controls

The VMX_PREEMPTION_TIMER flag may be toggled frequently, though not
*very* frequently.  Since it does not affect KVM's dirty logic, e.g.
the preemption timer value is loaded from vmcs12 even if vmcs12 is
"clean", there is no need to mark vmcs12 dirty when L1 writes pin
controls, and shadowing the field achieves that.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx/vmcs_shadow_fields.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/vmx/vmcs_shadow_fields.h b/arch/x86/kvm/vmx/vmcs_shadow_fields.h
index 4cea018ba285..eb1ecd16fd22 100644
--- a/arch/x86/kvm/vmx/vmcs_shadow_fields.h
+++ b/arch/x86/kvm/vmx/vmcs_shadow_fields.h
@@ -47,6 +47,7 @@
 SHADOW_FIELD_RO(GUEST_CS_AR_BYTES, guest_cs_ar_bytes)
 SHADOW_FIELD_RO(GUEST_SS_AR_BYTES, guest_ss_ar_bytes)
 SHADOW_FIELD_RW(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control)
+SHADOW_FIELD_RW(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control)
 SHADOW_FIELD_RW(EXCEPTION_BITMAP, exception_bitmap)
 SHADOW_FIELD_RW(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code)
 SHADOW_FIELD_RW(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field)
-- 
1.8.3.1