Patch "ptp: kvm: x86: Return EOPNOTSUPP instead of ENODEV from kvm_arch_ptp_init()" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    ptp: kvm: x86: Return EOPNOTSUPP instead of ENODEV from kvm_arch_ptp_init()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ptp-kvm-x86-return-eopnotsupp-instead-of-enodev-from.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1d78f1e056b21e7d9ed886ed4a17c915a1c25f1f
Author: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Date:   Tue Dec 3 18:09:55 2024 +0100

    ptp: kvm: x86: Return EOPNOTSUPP instead of ENODEV from kvm_arch_ptp_init()
    
    [ Upstream commit 5e7aa97c7acf171275ac02a8bb018c31b8918d13 ]
    
    The caller, ptp_kvm_init(), emits a warning if kvm_arch_ptp_init() exits
    with any error which is not EOPNOTSUPP:
    
            "fail to initialize ptp_kvm"
    
    Replace ENODEV with EOPNOTSUPP to avoid this spurious warning,
    aligning with the ARM implementation.
    
    Fixes: a86ed2cfa13c ("ptp: Don't print an error if ptp_kvm is not supported")
    Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
    Link: https://patch.msgid.link/20241203-kvm_ptp-eopnotsuppp-v2-1-d1d060f27aa6@xxxxxxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c
index 902844cc1a17..5e5b2ef78547 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;
 	}