From d21ac42171b150d6870e91a395f72845982311ff Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Thu, 14 Aug 2025 17:11:57 -0700
Subject: KVM: VMX: Handle KVM-induced preemption timer exits in fastpath for
 L2

From: Sean Christopherson <seanjc@google.com>

[ Upstream commit 7b3d1bbf8d68d76fb21210932a5e8ed8ea80dbcc ]

Eat VMX treemption timer exits in the fastpath regardless of whether L1 or
L2 is active.  The VM-Exit is 100% KVM-induced, i.e. there is nothing
directly related to the exit that KVM needs to do on behalf of the guest,
thus there is no reason to wait until the slow path to do nothing.

Opportunistically add comments explaining why preemption timer exits for
emulating the guest's APIC timer need to go down the slow path.

Link: https://lore.kernel.org/r/20240110012705.506918-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kvm/vmx/vmx.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 18ceed9046a9..4db9d41d988c 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5948,13 +5948,26 @@ static fastpath_t handle_fastpath_preemption_timer(struct kvm_vcpu *vcpu)
 	if (vmx->req_immediate_exit)
 		return EXIT_FASTPATH_EXIT_HANDLED;
 
+	/*
+	 * If L2 is active, go down the slow path as emulating the guest timer
+	 * expiration likely requires synthesizing a nested VM-Exit.
+	 */
+	if (is_guest_mode(vcpu))
+		return EXIT_FASTPATH_NONE;
+
 	kvm_lapic_expired_hv_timer(vcpu);
 	return EXIT_FASTPATH_REENTER_GUEST;
 }
 
 static int handle_preemption_timer(struct kvm_vcpu *vcpu)
 {
-	handle_fastpath_preemption_timer(vcpu);
+	/*
+	 * This non-fastpath handler is reached if and only if the preemption
+	 * timer was being used to emulate a guest timer while L2 is active.
+	 * All other scenarios are supposed to be handled in the fastpath.
+	 */
+	WARN_ON_ONCE(!is_guest_mode(vcpu));
+	kvm_lapic_expired_hv_timer(vcpu);
 	return 1;
 }
 
@@ -7138,7 +7151,12 @@ void noinstr vmx_spec_ctrl_restore_host(struct vcpu_vmx *vmx,
 
 static fastpath_t vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
 {
-	if (is_guest_mode(vcpu))
+	/*
+	 * If L2 is active, some VMX preemption timer exits can be handled in
+	 * the fastpath even, all other exits must use the slow path.
+	 */
+	if (is_guest_mode(vcpu) &&
+	    to_vmx(vcpu)->exit_reason.basic != EXIT_REASON_PREEMPTION_TIMER)
 		return EXIT_FASTPATH_NONE;
 
 	switch (to_vmx(vcpu)->exit_reason.basic) {
-- 
2.50.1