linux-kernel - [PATCH 2/9] KVM: nVMX: Initialize #VE info page for vmcs02 when proving #VE support

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Date: Fri, 17 May 2024 17:04:23 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/9] KVM: nVMX: Initialize #VE info page for vmcs02 when
 proving #VE support

Point vmcs02.VE_INFORMATION_ADDRESS at the vCPU's #VE info page when
initializing vmcs02, otherwise KVM will run L2 with EPT Violation #VE
enabled and a VE info address pointing at pfn 0.

Fixes: 8131cf5b4fd8 ("KVM: VMX: Introduce test mode related to EPT violation VE")
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/nested.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d5b832126e34..6798fadaa335 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2242,6 +2242,9 @@ static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
 		vmcs_write64(EPT_POINTER,
 			     construct_eptp(&vmx->vcpu, 0, PT64_ROOT_4LEVEL));
 
+	if (vmx->ve_info)
+		vmcs_write64(VE_INFORMATION_ADDRESS, __pa(vmx->ve_info));
+
 	/* All VMFUNCs are currently emulated through L0 vmexits.  */
 	if (cpu_has_vmx_vmfunc())
 		vmcs_write64(VM_FUNCTION_CONTROL, 0);
-- 
2.45.0.215.g3402c0e53f-goog