From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA319C433EF for ; Sat, 18 Jun 2022 00:16:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383531AbiFRAQd (ORCPT ); Fri, 17 Jun 2022 20:16:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383234AbiFRAQ1 (ORCPT ); Fri, 17 Jun 2022 20:16:27 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D64ED205E0 for ; Fri, 17 Jun 2022 17:16:25 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id v74-20020a252f4d000000b00668b16baa8bso3522017ybv.23 for ; Fri, 17 Jun 2022 17:16:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=gW22gs8afkvNNOw8jMwW6NEDJCCvGve0dMVsklM6MqE=; b=CCT2+SoDeEAmkD9AbYTlkGc/M0qQ9guL15Cmz/EsdZDhodAfjxXYZA/J18LtQD+pQG oykDa/rvQjYTaF0Mzx4hxTbNDxJwRaqhzgAIaaLyZHOGezq3b/mVSqY+yhpKBPttRWLy 0DSl+tHQwejzurx9ONqDdy6SN8hbJs4K34prKqf7PQRP4FPjPpLwlHiYc5WyPr+dRh8j 655OSo7A9inWzoIeW6J9cFw8lUT4R2f96ngcNfVPWc7/w0HETIvtTNX5/Mw7w5KnrIyQ NLXmnBQiozl0nS941IOOorKTZoBXiINlR3QzIZS4tsvyebV1PelU8UJIgVb757MoIjOB HHUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=gW22gs8afkvNNOw8jMwW6NEDJCCvGve0dMVsklM6MqE=; b=5XYBYPzSaFX/ckxSi+4ClZDwJNRZRxoX1kNDaRBasuMTCth4whviJ9xgGYD4WneK0q J8kTAYOOEIoCBTNX9WiBUOAjMchVn4D4S9gsJSSkLqXP3Znz05zgfASVYi3YSyr8yHAA 8H9Uk7n0Xsxcr0SoKV4dgEQr/o1A7NDtkK8qMzsp6Z+IPGFyCLUXsiHnlvRPu5Ub8/Yq ytg688oJj16zQgBnhHCfAce4INw9dWZ4uI6zgvYVNiP+/Aka0fHHng6r9ZtealO1OPZI fg2zOdnjiuL01Ru0BU58kK7SFxWB09E0Ql3cDSRfF4Poyyp0itQcZhl12yc99riNRuSW fajQ== X-Gm-Message-State: AJIora+UsVLSSEgfxSCF3KdN7aP8VnSQpUhg8SLwPtDbB5lN4Xzjge69 v6wNKCDEQ1ooSrnLumaIOF5uZgafPQU= X-Google-Smtp-Source: AGRyM1sCiHDm22+N+g86ktaptvosqpIpBza959Yy0j0jUmemEFFjbJDgy3C9aHvkL0tqnrBGBsB7eOgKFEE= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a81:9187:0:b0:317:76c5:3b44 with SMTP id i129-20020a819187000000b0031776c53b44mr10212452ywg.103.1655511385084; Fri, 17 Jun 2022 17:16:25 -0700 (PDT) Reply-To: Sean Christopherson Date: Sat, 18 Jun 2022 00:16:17 +0000 In-Reply-To: <20220618001618.1840806-1-seanjc@google.com> Message-Id: <20220618001618.1840806-3-seanjc@google.com> Mime-Version: 1.0 References: <20220618001618.1840806-1-seanjc@google.com> X-Mailer: git-send-email 2.37.0.rc0.104.g0611611a94-goog Subject: [PATCH 2/3] KVM: selftests: Consolidate boilerplate code in get_ucall() From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Colton Lewis , Andrew Jones , Sean Christopherson Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Consolidate the actual copying of a ucall struct from guest=>host into the common get_ucall(). Return a host virtual address instead of a guest virtual address even though the addr_gva2hva() part could be moved to get_ucall() too. Conceptually, get_ucall() is invoked from the host and should return a host virtual address (and returning NULL for "nothing to see here" is far superior to returning 0). Use pointer shenanigans instead of an unnecessary bounce buffer when the caller of get_ucall() provides a valid pointer. Signed-off-by: Sean Christopherson --- .../selftests/kvm/include/ucall_common.h | 8 ++------ .../testing/selftests/kvm/lib/aarch64/ucall.c | 15 +++------------ tools/testing/selftests/kvm/lib/riscv/ucall.c | 19 +++---------------- tools/testing/selftests/kvm/lib/s390x/ucall.c | 16 +++------------- .../testing/selftests/kvm/lib/ucall_common.c | 19 +++++++++++++++++++ .../testing/selftests/kvm/lib/x86_64/ucall.c | 16 +++------------- 6 files changed, 33 insertions(+), 60 deletions(-) diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/testing/selftests/kvm/include/ucall_common.h index c6a4fd7fe443..cb9b37282701 100644 --- a/tools/testing/selftests/kvm/include/ucall_common.h +++ b/tools/testing/selftests/kvm/include/ucall_common.h @@ -26,9 +26,10 @@ struct ucall { void ucall_arch_init(struct kvm_vm *vm, void *arg); void ucall_arch_uninit(struct kvm_vm *vm); void ucall_arch_do_ucall(vm_vaddr_t uc); -uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc); +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu); void ucall(uint64_t cmd, int nargs, ...); +uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc); static inline void ucall_init(struct kvm_vm *vm, void *arg) { @@ -40,11 +41,6 @@ static inline void ucall_uninit(struct kvm_vm *vm) ucall_arch_uninit(vm); } -static inline uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) -{ - return ucall_arch_get_ucall(vcpu, uc); -} - #define GUEST_SYNC_ARGS(stage, arg1, arg2, arg3, arg4) \ ucall(UCALL_SYNC, 6, "hello", stage, arg1, arg2, arg3, arg4) #define GUEST_SYNC(stage) ucall(UCALL_SYNC, 2, "hello", stage) diff --git a/tools/testing/selftests/kvm/lib/aarch64/ucall.c b/tools/testing/selftests/kvm/lib/aarch64/ucall.c index 2de9fdd34159..9c124adbb560 100644 --- a/tools/testing/selftests/kvm/lib/aarch64/ucall.c +++ b/tools/testing/selftests/kvm/lib/aarch64/ucall.c @@ -75,13 +75,9 @@ void ucall_arch_do_ucall(vm_vaddr_t uc) *ucall_exit_mmio_addr = uc; } -uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_MMIO && run->mmio.phys_addr == (uint64_t)ucall_exit_mmio_addr) { @@ -90,12 +86,7 @@ uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) TEST_ASSERT(run->mmio.is_write && run->mmio.len == 8, "Unexpected ucall exit mmio address access"); memcpy(&gva, run->mmio.data, sizeof(gva)); - memcpy(&ucall, addr_gva2hva(vcpu->vm, gva), sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return addr_gva2hva(vcpu->vm, gva); } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/riscv/ucall.c b/tools/testing/selftests/kvm/lib/riscv/ucall.c index b1598f418c1f..37e091d4366e 100644 --- a/tools/testing/selftests/kvm/lib/riscv/ucall.c +++ b/tools/testing/selftests/kvm/lib/riscv/ucall.c @@ -51,27 +51,15 @@ void ucall_arch_do_ucall(vm_vaddr_t uc) uc, 0, 0, 0, 0, 0); } -uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_RISCV_SBI && run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) { switch (run->riscv_sbi.function_id) { case KVM_RISCV_SELFTESTS_SBI_UCALL: - memcpy(&ucall, - addr_gva2hva(vcpu->vm, run->riscv_sbi.args[0]), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); - - break; + return addr_gva2hva(vcpu->vm, run->riscv_sbi.args[0]); case KVM_RISCV_SELFTESTS_SBI_UNEXP: vcpu_dump(stderr, vcpu, 2); TEST_ASSERT(0, "Unexpected trap taken by guest"); @@ -80,6 +68,5 @@ uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) break; } } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/s390x/ucall.c b/tools/testing/selftests/kvm/lib/s390x/ucall.c index 114cb4af295f..0f695a031d35 100644 --- a/tools/testing/selftests/kvm/lib/s390x/ucall.c +++ b/tools/testing/selftests/kvm/lib/s390x/ucall.c @@ -20,13 +20,9 @@ void ucall_arch_do_ucall(vm_vaddr_t uc) asm volatile ("diag 0,%0,0x501" : : "a"(uc) : "memory"); } -uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_S390_SIEIC && run->s390_sieic.icptcode == 4 && @@ -34,13 +30,7 @@ uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) (run->s390_sieic.ipb >> 16) == 0x501) { int reg = run->s390_sieic.ipa & 0xf; - memcpy(&ucall, addr_gva2hva(vcpu->vm, run->s.regs.gprs[reg]), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return addr_gva2hva(vcpu->vm, run->s.regs.gprs[reg]); } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c index 749ffdf23855..c488ed23d0dd 100644 --- a/tools/testing/selftests/kvm/lib/ucall_common.c +++ b/tools/testing/selftests/kvm/lib/ucall_common.c @@ -18,3 +18,22 @@ void ucall(uint64_t cmd, int nargs, ...) ucall_arch_do_ucall((vm_vaddr_t)&uc); } + +uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +{ + struct ucall ucall; + void *addr; + + if (!uc) + uc = &ucall; + + addr = ucall_arch_get_ucall(vcpu); + if (addr) { + memcpy(uc, addr, sizeof(*uc)); + vcpu_run_complete_io(vcpu); + } else { + memset(uc, 0, sizeof(*uc)); + } + + return uc->cmd; +} diff --git a/tools/testing/selftests/kvm/lib/x86_64/ucall.c b/tools/testing/selftests/kvm/lib/x86_64/ucall.c index 9f532dba1003..ec53a406f689 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/ucall.c +++ b/tools/testing/selftests/kvm/lib/x86_64/ucall.c @@ -22,25 +22,15 @@ void ucall_arch_do_ucall(vm_vaddr_t uc) : : [port] "d" (UCALL_PIO_PORT), "D" (uc) : "rax", "memory"); } -uint64_t ucall_arch_get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_IO && run->io.port == UCALL_PIO_PORT) { struct kvm_regs regs; vcpu_regs_get(vcpu, ®s); - memcpy(&ucall, addr_gva2hva(vcpu->vm, (vm_vaddr_t)regs.rdi), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return addr_gva2hva(vcpu->vm, (vm_vaddr_t)regs.rdi); } - - return ucall.cmd; + return NULL; } -- 2.37.0.rc0.104.g0611611a94-goog