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Tue, 25 Nov 2025 07:46:08 +0000 (GMT) From: Andrew Donnellan Date: Tue, 25 Nov 2025 18:45:52 +1100 Subject: [PATCH 1/3] KVM: s390: Add signal_exits counter Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251125-s390-kvm-xfer-to-guest-work-v1-1-091281a34611@linux.ibm.com> References: <20251125-s390-kvm-xfer-to-guest-work-v1-0-091281a34611@linux.ibm.com> In-Reply-To: <20251125-s390-kvm-xfer-to-guest-work-v1-0-091281a34611@linux.ibm.com> To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle Cc: Nicholas Miehlbradt , Thomas Gleixner , Peter Zijlstra , Andy Lutomirski , David Hildenbrand X-Mailer: b4 0.14.2 X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTIyMDAyMSBTYWx0ZWRfX93/PiJrgs8IA AaudWQWICpxTav2KBwI7EYLtFJ7/PN0ReI60Ni+P2OKGorQvcNAfnVWhRBPLQ2PSQRUSBGyib0l Zx2hFxBB1iF6bf7mD+V5ibsNsySsRhzoG2lYWdyujOuINzXP9ImgkynhpVRDkdhREbHJ6ym2asg GZq0MH9OG9evRTQiC5rrmpAPSM+vIqqJXiSH2GRL2fASIJzxLjB5l009JmFAYQA1cEjR6iflOgZ ChVveIa4MpAnfLmm0Rwh/sfOdiUeEKFYPy6DFNwir+I4zXpH313GBLb9pAZ8keAN3W0MqPAesTd uAUlF/pQ/4/u/x3alNfqcH/oV3p1eW/Jv0X16yDaO85QplHs+T+DA+3h41zsgXkpY81gQuEzmWx IMHXIXV4z8kWqjyCc7iUsOKKxIgPGQ== X-Proofpoint-ORIG-GUID: wF2B8_1XnB89yi7T06xI9BN2aSoZbrKe X-Proofpoint-GUID: wF2B8_1XnB89yi7T06xI9BN2aSoZbrKe X-Authority-Analysis: v=2.4 cv=TMJIilla c=1 sm=1 tr=0 ts=69255eca cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=G-lmFN37WTdQfOt6kDkA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-25_02,2025-11-24_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 phishscore=0 impostorscore=0 clxscore=1015 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511220021 Add a signal_exits counter for s390, as exists on arm64, loongarch, mips, powerpc, riscv and x86. This is used by kvm_handle_signal_exit(), which we will use when we later enable CONFIG_VIRT_XFER_TO_GUEST_WORK. Signed-off-by: Andrew Donnellan --- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/kvm/kvm-s390.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_h= ost.h index c2ba3d4398c5371526ddfd53b43607c00abc35a1..1b08a250fb341f7bd2d19810392= c1c6e21673b64 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -146,6 +146,7 @@ struct kvm_vcpu_stat { u64 instruction_diagnose_500; u64 instruction_diagnose_other; u64 pfault_sync; + u64 signal_exits; }; =20 #define PGM_OPERATION 0x01 diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 16ba04062854a99ab7d48ac427b690006ea8e7eb..fa6b5150ca31e4d9f0bdafabc1f= b1d90ef3f3d0d 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -185,7 +185,8 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] =3D { STATS_DESC_COUNTER(VCPU, instruction_diagnose_308), STATS_DESC_COUNTER(VCPU, instruction_diagnose_500), STATS_DESC_COUNTER(VCPU, instruction_diagnose_other), - STATS_DESC_COUNTER(VCPU, pfault_sync) + STATS_DESC_COUNTER(VCPU, pfault_sync), + STATS_DESC_COUNTER(VCPU, signal_exits) }; =20 const struct kvm_stats_header kvm_vcpu_stats_header =3D { @@ -5364,6 +5365,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) =20 if (signal_pending(current) && !rc) { kvm_run->exit_reason =3D KVM_EXIT_INTR; + vcpu->stat.signal_exits++; rc =3D -EINTR; } =20 --=20 2.52.0