linux-kernel - [PATCH 3/3] nVMX: Advertise PML to L1 hypervisor

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Message-Id: <20170503221457.18869-4-bsd@redhat.com>
Date:   Wed,  3 May 2017 18:14:57 -0400
From:   Bandan Das <bsd@...hat.com>
To:     kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] nVMX: Advertise PML to L1 hypervisor

Advertise the PML bit in vmcs12 but clear it out
before running L2 since we don't depend on hardware support
for PML emulation.

Signed-off-by: Bandan Das <bsd@...hat.com>
---
 arch/x86/kvm/vmx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5e5abb7..df71116 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2763,8 +2763,11 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
 		vmx->nested.nested_vmx_ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT |
 			VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT |
 			VMX_EPT_1GB_PAGE_BIT;
-	       if (enable_ept_ad_bits)
+		if (enable_ept_ad_bits) {
+			vmx->nested.nested_vmx_secondary_ctls_high |=
+				SECONDARY_EXEC_ENABLE_PML;
 		       vmx->nested.nested_vmx_ept_caps |= VMX_EPT_AD_BIT;
+		}
 	} else
 		vmx->nested.nested_vmx_ept_caps = 0;
 
@@ -10080,6 +10083,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 		if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)
 			vmcs_write64(APIC_ACCESS_ADDR, -1ull);
 
+		exec_control &= ~SECONDARY_EXEC_ENABLE_PML;
 		vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
 	}
 
-- 
2.9.3