linux-kernel - [PATCH v7 1/5] ptp_kvm: probe for kvm guest availability

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Date:   Thu, 19 Oct 2017 14:39:14 +0100
From:   Joao Martins <joao.m.martins@...cle.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Joao Martins <joao.m.martins@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v7 1/5] ptp_kvm: probe for kvm guest availability

In the event of moving pvclock_pvti_cpu0_va() definition to common
pvclock code, this function could return a value on non KVM guests.
If user tried to load the module (or have it builtin) it would fail
with a GPF on ptp_kvm_init when running on a Xen guest. Therefore,
ptp_kvm_init() should check whether it is running in a KVM guest.

Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
---
New in v7;
---
 drivers/ptp/ptp_kvm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ptp/ptp_kvm.c b/drivers/ptp/ptp_kvm.c
index 2b1b212c219e..e04d7b2ecb3a 100644
--- a/drivers/ptp/ptp_kvm.c
+++ b/drivers/ptp/ptp_kvm.c
@@ -178,6 +178,9 @@ static int __init ptp_kvm_init(void)
 {
 	long ret;
 
+	if (!kvm_para_available())
+		return -ENODEV;
+
 	clock_pair_gpa = slow_virt_to_phys(&clock_pair);
 	hv_clock = pvclock_pvti_cpu0_va();
 
-- 
2.11.0