linux-kernel - [PATCH] ptp: kvm: Return EOPNOTSUPP instead of ENODEV from kvm_arch_ptp

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Message-Id: <20241127-kvm_ptp-eopnotsuppp-v1-1-dfae48de972c@weissschuh.net>
Date: Wed, 27 Nov 2024 08:27:57 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Richard Cochran <richardcochran@...il.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] ptp: kvm: Return EOPNOTSUPP instead of ENODEV from
 kvm_arch_ptp_init()

The caller ptp_kvm_init() expects EOPNOTSUPP in case KVMCLOCK is not
available and not ENODEV.
Adapt the returned error code to avoid spurious errors in the kernel log:

"fail to initialize ptp_kvm"

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/ptp/ptp_kvm_x86.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c
index 617c8d6706d3d00f7167fbf7e5b624ced29a206d..6cea4fe39bcfe46ba3b54b0815d3a3d034d415ea 100644
--- a/drivers/ptp/ptp_kvm_x86.c
+++ b/drivers/ptp/ptp_kvm_x86.c
@@ -26,7 +26,7 @@ int kvm_arch_ptp_init(void)
 	long ret;
 
 	if (!kvm_para_available())
-		return -ENODEV;
+		return -EOPNOTSUPP;
 
 	if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
 		p = alloc_page(GFP_KERNEL | __GFP_ZERO);
@@ -46,14 +46,14 @@ int kvm_arch_ptp_init(void)
 
 	clock_pair_gpa = slow_virt_to_phys(clock_pair);
 	if (!pvclock_get_pvti_cpu0_va()) {
-		ret = -ENODEV;
+		ret = -EOPNOTSUPP;
 		goto err;
 	}
 
 	ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
 			     KVM_CLOCK_PAIRING_WALLCLOCK);
 	if (ret == -KVM_ENOSYS) {
-		ret = -ENODEV;
+		ret = -EOPNOTSUPP;
 		goto err;
 	}
 

---
base-commit: aaf20f870da056752f6386693cc0d8e25421ef35
change-id: 20241127-kvm_ptp-eopnotsuppp-d00278d22b01

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>