linux-kernel - [PATCH 03/17] KVM: monolithic: x86: handle the request_immediate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190920212509.2578-4-aarcange@redhat.com>
Date:   Fri, 20 Sep 2019 17:24:55 -0400
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/17] 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_ops.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx_ops.c b/arch/x86/kvm/vmx/vmx_ops.c
index cdcad73935d9..25d441432901 100644
--- a/arch/x86/kvm/vmx/vmx_ops.c
+++ b/arch/x86/kvm/vmx/vmx_ops.c
@@ -498,7 +498,10 @@ int kvm_x86_ops_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
 
 void kvm_x86_ops_request_immediate_exit(struct kvm_vcpu *vcpu)
 {
-	vmx_request_immediate_exit(vcpu);
+	if (likely(enable_preemption_timer))
+		vmx_request_immediate_exit(vcpu);
+	else
+		__kvm_request_immediate_exit(vcpu);
 }
 
 void kvm_x86_ops_sched_in(struct kvm_vcpu *kvm, int cpu)