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AJvYcCWelt+wnuLcJxANY2AmguHQBWOv5+ATs1YbrS0wLGEUDQSnLRufW6KsAAFngkXW7v/VmO1nv+c58Otm0CM=@vger.kernel.org X-Gm-Message-State: AOJu0YwWqMPuKxYx79xJ+0uGaJIvlCfIyADaLA6Af3g6MZuiUFFqR10r E/E1dOQik6MK7+1awdqVtt8XfzrrmZFJt3ar8vnCFG5U/V6UAqzgmTs2swx5p1cZz5BtBoGRIIV PTSY8JxU+Ota1fbl8emRkgg== X-Google-Smtp-Source: AGHT+IHW8Awj1az2kZDKXFyRTHzAsu7nHW73nuWNFHatSp354fmtn6egEeLp32OhYFxf0/BZ1Nce5gFMY5p11LmLng== X-Received: from pjbee14.prod.google.com ([2002:a17:90a:fc4e:b0:301:1bf5:2f07]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5788:b0:2fe:baa3:b8bc with SMTP id 98e67ed59e1d1-30e51930f95mr563390a91.23.1747266194209; Wed, 14 May 2025 16:43:14 -0700 (PDT) Date: Wed, 14 May 2025 16:41:50 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.49.0.1045.g170613ef41-goog Message-ID: <09e75529c3f844b1bb4dd5a096ed4160905fca7f.1747264138.git.ackerleytng@google.com> Subject: [RFC PATCH v2 11/51] KVM: selftests: Allow cleanup of ucall_pool from host From: Ackerley Tng To: kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-fsdevel@vger.kernel.org Cc: ackerleytng@google.com, aik@amd.com, ajones@ventanamicro.com, akpm@linux-foundation.org, amoorthy@google.com, anthony.yznaga@oracle.com, anup@brainfault.org, aou@eecs.berkeley.edu, bfoster@redhat.com, binbin.wu@linux.intel.com, brauner@kernel.org, catalin.marinas@arm.com, chao.p.peng@intel.com, chenhuacai@kernel.org, dave.hansen@intel.com, david@redhat.com, dmatlack@google.com, dwmw@amazon.co.uk, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, graf@amazon.com, haibo1.xu@intel.com, hch@infradead.org, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgg@ziepe.ca, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, kirill.shutemov@intel.com, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maz@kernel.org, mic@digikod.net, michael.roth@amd.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, pdurrant@amazon.co.uk, peterx@redhat.com, pgonda@google.com, pvorel@suse.cz, qperret@google.com, quic_cvanscha@quicinc.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, quic_svaddagi@quicinc.com, quic_tsoni@quicinc.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, thomas.lendacky@amd.com, usama.arif@bytedance.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Many selftests use GUEST_DONE() to signal the end of guest code, which is handled in userspace. In most tests, the test exits and there is no need to clean up the ucall_pool->in_use bitmap. If there are many guest code functions using GUEST_DONE(), or of guest code functions are run many times, the ucall_pool->in_use bitmap will fill up, causing later runs of the same guest code function to fail. This patch allows ucall_free() to be called from userspace on uc.hva, which will unset and free the correct struct ucall in the pool, allowing ucalls to continue being used. Change-Id: I2cb2aeed4b291b1bfb2bece001d09c509cd10446 Signed-off-by: Ackerley Tng --- .../testing/selftests/kvm/include/ucall_common.h | 1 + tools/testing/selftests/kvm/lib/ucall_common.c | 16 ++++++++-------- 2 files changed, 9 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/tes= ting/selftests/kvm/include/ucall_common.h index d9d6581b8d4f..b6b850d0319a 100644 --- a/tools/testing/selftests/kvm/include/ucall_common.h +++ b/tools/testing/selftests/kvm/include/ucall_common.h @@ -40,6 +40,7 @@ __printf(5, 6) void ucall_assert(uint64_t cmd, const char= *exp, const char *fmt, ...); uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc); void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa); +void ucall_free(struct ucall *uc); int ucall_nr_pages_required(uint64_t page_size); =20 /* diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing= /selftests/kvm/lib/ucall_common.c index 42151e571953..9b6865c39ea7 100644 --- a/tools/testing/selftests/kvm/lib/ucall_common.c +++ b/tools/testing/selftests/kvm/lib/ucall_common.c @@ -21,24 +21,24 @@ int ucall_nr_pages_required(uint64_t page_size) =20 /* * ucall_pool holds per-VM values (global data is duplicated by each VM), = it - * must not be accessed from host code. + * should generally not be accessed from host code other than via ucall_fr= ee(), + * to cleanup after using GUEST_DONE() */ static struct ucall_header *ucall_pool; =20 void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) { - struct ucall_header *hdr; struct ucall *uc; vm_vaddr_t vaddr; int i; =20 - vaddr =3D vm_vaddr_alloc_shared(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR, - MEM_REGION_DATA); - hdr =3D (struct ucall_header *)addr_gva2hva(vm, vaddr); - memset(hdr, 0, sizeof(*hdr)); + vaddr =3D vm_vaddr_alloc_shared(vm, sizeof(*ucall_pool), + KVM_UTIL_MIN_VADDR, MEM_REGION_DATA); + ucall_pool =3D (struct ucall_header *)addr_gva2hva(vm, vaddr); + memset(ucall_pool, 0, sizeof(*ucall_pool)); =20 for (i =3D 0; i < KVM_MAX_VCPUS; ++i) { - uc =3D &hdr->ucalls[i]; + uc =3D &ucall_pool->ucalls[i]; uc->hva =3D uc; } =20 @@ -73,7 +73,7 @@ static struct ucall *ucall_alloc(void) return NULL; } =20 -static void ucall_free(struct ucall *uc) +void ucall_free(struct ucall *uc) { /* Beware, here be pointer arithmetic. */ clear_bit(uc - ucall_pool->ucalls, ucall_pool->in_use); --=20 2.49.0.1045.g170613ef41-goog