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Fri, 28 Aug 2026 11:33:00 +0000 (GMT) Received: from [9.87.143.119] (unknown [9.87.143.119]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 28 Aug 2026 11:33:00 +0000 (GMT) Message-ID: Date: Fri, 28 Aug 2026 13:33:00 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 28/33] KVM: s390: Add basic arm64 kvm module To: Steffen Eiden , kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Alexander Gordeev , Andreas Grapentin , Arnd Bergmann , Catalin Marinas , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Friedrich Welter , Fuad Tabba , Gautam Gala , Hariharan Mari , Heiko Carstens , Hendrik Brueckner , Ilya Leoshkevich , Joey Gouly , Marc Zyngier , Nico Boehr , Nina Schoetterl-Glausch , Oliver Upton , Paolo Bonzini , Sean Christopherson , Suzuki K Poulose , Sven Schnelle , Ulrich Weigand , Vasily Gorbik , Will Deacon , Zenghui Yu References: <20260812153631.3376090-1-seiden@linux.ibm.com> <20260812153631.3376090-29-seiden@linux.ibm.com> Content-Language: en-US From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: Fl05lT8lTvl5jjInMeYPBy931060VZS6 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI4MDA5OSBTYWx0ZWRfX7ODFUaxZ7KN2 e8roJ4MAp6NqgL1RegqaHdf+JIU0iWlsvWW0gFFplpYO1cnKaDb3ofp+XBA74jxMWFKKH/SI40R sRtjbA3VOsSqJQfSb6+sHr7XNWkh4Z2sB+Rw2SLL4g5ot7DYFKAjziBnq2adNPGUjpSJNZyx7so A1b108JCMMdOCXHIvh99xp18x1f85gYetzNPMgWCE/x7GlBIOmTcp0O13Q96nxFiNUKMOlxLfAr V2CGOYLi9FYXCglEE6gAnscM88SgYcc1+Kfz2JdcCqXI8q/pWGtT4d9ehc71tz1qOMwGfSQCUpZ hMFB6jIM+mgIREMZUt11+Gt5h1ci4VOoV7fmj+YR2hedo7qxWmVkefJvo9RAuhdPNQSsAkAviT+ j7ePHoivYSmURHV0//YrOBa7c/xl4HVozFvwD/wLiTQ05s8Styl8RUAiwsZQ0WXhceKD5wmsCvt t0q56NZvoZcCLEovEaQ== X-Authority-Analysis: v=2.4 cv=Y/nIdBeN c=1 sm=1 tr=0 ts=6a9171f4 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=AQcYv4YVjL3v3HVgylcA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI4MDA5OSBTYWx0ZWRfXzQxal/zBR3Yd zl2Qn2cyGSuuf9qjXgpjVsUpOeRIrCc/5+BFZ3f9eF+/74Uc27gEoacOdqVNcjDhvWgAHtl53Vc JJwrzbRUYZDUEjgrnbZcbNlUHja3Dws= X-Proofpoint-ORIG-GUID: sWyJWYvi76vIYt1-afjYNcx20P2NljP7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-28_03,2026-08-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 priorityscore=1501 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 clxscore=1011 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608280099 On 8/12/26 5:36 PM, Steffen Eiden wrote: > Add basic code for the new arm64 on s390 KVM implementation. > Add kernel module boilerplate code and trivial functions. > Add tracing scaffolding. > > Signed-off-by: Steffen Eiden > --- > arch/s390/kvm/arm64/arm.c | 157 ++++++++++++++++++++++++++++++++++++ > arch/s390/kvm/arm64/arm.h | 7 ++ > arch/s390/kvm/arm64/guest.c | 92 +++++++++++++++++++++ > arch/s390/kvm/arm64/trace.h | 18 +++++ > 4 files changed, 274 insertions(+) > create mode 100644 arch/s390/kvm/arm64/arm.c > create mode 100644 arch/s390/kvm/arm64/arm.h > create mode 100644 arch/s390/kvm/arm64/guest.c > create mode 100644 arch/s390/kvm/arm64/trace.h > > diff --git a/arch/s390/kvm/arm64/arm.c b/arch/s390/kvm/arm64/arm.c > new file mode 100644 > index 000000000000..8e17b7eef813 > --- /dev/null > +++ b/arch/s390/kvm/arm64/arm.c > @@ -0,0 +1,157 @@ [...] > + > +static u64 kvm_max_guest_address(void) > +{ > + u64 max_addr; > + > + if (sclp.hamax == U64_MAX) > + max_addr = TASK_SIZE_MAX; > + else > + max_addr = min_t(u64, TASK_SIZE_MAX, sclp.hamax); > + return ALIGN_DOWN(max_addr + 1, 1 << 30) - 1; > +} We're sure that the MSLA + 1 - MSOA > MGPAS check aka VIR code 4 will never bite us? Or will you touch this up with the qmc support?