linux-kernel - [patch V2 7/7] x86/kvm/vmx: Use native read/write

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Message-Id: <20200708195322.344731916@linutronix.de>
Date:   Wed, 08 Jul 2020 21:52:00 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        kvm@...r.kernel.org,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juergen Gross <jgross@...e.com>
Subject: [patch V2 7/7] x86/kvm/vmx: Use native read/write_cr2()

From: Thomas Gleixner <tglx@...utronix.de>

read/write_cr2() go throuh the paravirt XXL indirection, but nested VMX in
a XEN_PV guest is not supported.

Use the native variants.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kvm/vmx/vmx.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6683,13 +6683,13 @@ static noinstr void vmx_vcpu_enter_exit(
 	else if (static_branch_unlikely(&mds_user_clear))
 		mds_clear_cpu_buffers();
 
-	if (vcpu->arch.cr2 != read_cr2())
-		write_cr2(vcpu->arch.cr2);
+	if (vcpu->arch.cr2 != native_read_cr2())
+		native_write_cr2(vcpu->arch.cr2);
 
 	vmx->fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs,
 				   vmx->loaded_vmcs->launched);
 
-	vcpu->arch.cr2 = read_cr2();
+	vcpu->arch.cr2 = native_read_cr2();
 
 	/*
 	 * VMEXIT disables interrupts (host state), but tracing and lockdep