linux-kernel - [PATCH 04/13] KVM: monolithic: x86: handle the request_immediate

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Message-Id: <20191104230001.27774-5-aarcange@redhat.com>
Date:   Mon,  4 Nov 2019 17:59:52 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH 04/13] KVM: monolithic: x86: handle the request_immediate_exit variation

request_immediate_exit is one of those few cases where the pointer to
function of the method isn't fixed at build time and it requires
special handling because hardware_setup() may override it at runtime.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 arch/x86/kvm/vmx/vmx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1a58ae38c8f2..9c5f0c67b899 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7103,7 +7103,10 @@ void kvm_x86_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 
 void kvm_x86_request_immediate_exit(struct kvm_vcpu *vcpu)
 {
-	to_vmx(vcpu)->req_immediate_exit = true;
+	if (likely(enable_preemption_timer))
+		to_vmx(vcpu)->req_immediate_exit = true;
+	else
+		__kvm_request_immediate_exit(vcpu);
 }
 
 int kvm_x86_check_intercept(struct kvm_vcpu *vcpu,