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Wed, 06 May 2026 06:21:45 -0700 (PDT) Received: from osama ([2a02:908:1b6:8980:89b3:e462:e9ca:df27]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e53895f0asm52221165e9.2.2026.05.06.06.21.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 May 2026 06:21:45 -0700 (PDT) Date: Wed, 6 May 2026 15:21:43 +0200 From: Osama Abdelkader To: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH] riscv: kvm: return SBI_ERR_FAILURE for PMU shmem OOM Message-ID: References: <20260415220930.287592-1-osama.abdelkader@gmail.com> 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=us-ascii Content-Disposition: inline In-Reply-To: <20260415220930.287592-1-osama.abdelkader@gmail.com> On Thu, Apr 16, 2026 at 12:09:30AM +0200, Osama Abdelkader wrote: > kvm_riscv_vcpu_pmu_snapshot_set_shmem() and kvm_riscv_vcpu_pmu_event_info() > returned -ENOMEM from the SBI extension handler, which caused > kvm_riscv_vcpu_sbi_ecall() to abort KVM_RUN and surface the error to > userspace instead of completing the ECALL with a negative SBI error in a0. > Use SBI_ERR_FAILURE and the normal retdata path, matching other PMU > handlers and kvm_sbi_ext_pmu_handler comment. > > Signed-off-by: Osama Abdelkader > --- > arch/riscv/kvm/vcpu_pmu.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c > index e873430e596b..f36b099f447c 100644 > --- a/arch/riscv/kvm/vcpu_pmu.c > +++ b/arch/riscv/kvm/vcpu_pmu.c > @@ -435,8 +435,10 @@ int kvm_riscv_vcpu_pmu_snapshot_set_shmem(struct kvm_vcpu *vcpu, unsigned long s > } > > kvpmu->sdata = kzalloc(snapshot_area_size, GFP_ATOMIC); > - if (!kvpmu->sdata) > - return -ENOMEM; > + if (!kvpmu->sdata) { > + sbiret = SBI_ERR_FAILURE; > + goto out; > + } > > /* No need to check writable slot explicitly as kvm_vcpu_write_guest does it internally */ > if (kvm_vcpu_write_guest(vcpu, saddr, kvpmu->sdata, snapshot_area_size)) { > @@ -480,8 +482,10 @@ int kvm_riscv_vcpu_pmu_event_info(struct kvm_vcpu *vcpu, unsigned long saddr_low > } > > einfo = kzalloc(shmem_size, GFP_KERNEL); > - if (!einfo) > - return -ENOMEM; > + if (!einfo) { > + ret = SBI_ERR_FAILURE; > + goto out; > + } > > ret = kvm_vcpu_read_guest(vcpu, shmem, einfo, shmem_size); > if (ret) { > -- > 2.43.0 > ping.