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[2003:c9:3f07:9e00:cac8:7036:72d9:8936]) by smtp.gmail.com with ESMTPSA id ew5-20020a05622a514500b00430c8b87b46sm1832001qtb.6.2024.03.18.04.16.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Mar 2024 04:16:47 -0700 (PDT) From: Sebastian Ott To: linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier , Oliver Upton Subject: [PATCH 4/4] KVM: selftests: aarch64: add tool to dump registers Date: Mon, 18 Mar 2024 12:16:36 +0100 Message-ID: <20240318111636.10613-5-sebott@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240318111636.10613-1-sebott@redhat.com> References: <20240318111636.10613-1-sebott@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240318_041831_674972_78F9F0E9 X-CRM114-Status: GOOD ( 16.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Iterate over registers obtained via KVM_GET_REG_LIST, dump their values and writable masks. Signed-off-by: Sebastian Ott --- tools/testing/selftests/kvm/Makefile | 1 + .../testing/selftests/kvm/aarch64/dump_regs.c | 72 +++++++++++++++++++ 2 files changed, 73 insertions(+) create mode 100644 tools/testing/selftests/kvm/aarch64/dump_regs.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 492e937fab00..3bbb163abb1e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -145,6 +145,7 @@ TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs TEST_GEN_PROGS_aarch64 += aarch64/arch_timer TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions +TEST_GEN_PROGS_aarch64 += aarch64/dump_regs TEST_GEN_PROGS_aarch64 += aarch64/hypercalls TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test TEST_GEN_PROGS_aarch64 += aarch64/psci_test diff --git a/tools/testing/selftests/kvm/aarch64/dump_regs.c b/tools/testing/selftests/kvm/aarch64/dump_regs.c new file mode 100644 index 000000000000..390b4629ca12 --- /dev/null +++ b/tools/testing/selftests/kvm/aarch64/dump_regs.c @@ -0,0 +1,72 @@ +#include +#include "kvm_util.h" +#include "processor.h" +#include "test_util.h" +#include + +static uint64_t masks[KVM_ARM_FEATURE_ID_RANGE_SIZE]; + +static void guest_code(void) +{ +} + +static void get_writable_masks(struct kvm_vm *vm) +{ + struct reg_mask_range range = { + .addr = (__u64)masks, + }; + + memset(range.reserved, 0, sizeof(range.reserved)); + vm_ioctl(vm, KVM_ARM_GET_REG_WRITABLE_MASKS, &range); +} + +#define kvm_sys_reg_Op0(id) (((id) & KVM_REG_ARM64_SYSREG_OP0_MASK) >> KVM_REG_ARM64_SYSREG_OP0_SHIFT) +#define kvm_sys_reg_Op1(id) (((id) & KVM_REG_ARM64_SYSREG_OP1_MASK) >> KVM_REG_ARM64_SYSREG_OP1_SHIFT) +#define kvm_sys_reg_CRn(id) (((id) & KVM_REG_ARM64_SYSREG_CRN_MASK) >> KVM_REG_ARM64_SYSREG_CRN_SHIFT) +#define kvm_sys_reg_CRm(id) (((id) & KVM_REG_ARM64_SYSREG_CRM_MASK) >> KVM_REG_ARM64_SYSREG_CRM_SHIFT) +#define kvm_sys_reg_Op2(id) (((id) & KVM_REG_ARM64_SYSREG_OP2_MASK) >> KVM_REG_ARM64_SYSREG_OP2_SHIFT) + +static bool reg_in_feature_id_range(uint64_t reg) +{ + return kvm_sys_reg_Op0(reg) == 3 && + kvm_sys_reg_Op1(reg) >= 0 && kvm_sys_reg_Op1(reg) <= 3 && + kvm_sys_reg_CRn(reg) == 0 && + kvm_sys_reg_CRm(reg) >= 0 && kvm_sys_reg_CRm(reg) <= 7 && + kvm_sys_reg_Op2(reg) >= 0 && kvm_sys_reg_Op2(reg) <= 7; +} + +static uint64_t reg_get_mask(uint64_t reg) +{ + int idx = KVM_ARM_FEATURE_ID_RANGE_IDX(kvm_sys_reg_Op0(reg), kvm_sys_reg_Op1(reg), + kvm_sys_reg_CRn(reg), kvm_sys_reg_CRm(reg), + kvm_sys_reg_Op2(reg)); + + return reg_in_feature_id_range(reg) ? masks[idx] : 0; +} + +static void dump_regs(struct kvm_vcpu *vcpu) +{ + struct kvm_reg_list *reg_list = vcpu_get_reg_list(vcpu); + uint64_t reg, val[8]; + int i, ret; + + for (i = 0; i < reg_list->n; i++) { + reg = reg_list->reg[i]; + ret = __vcpu_get_reg(vcpu, reg, val); + if (!ret) + pr_info("%lx : %16lx %lx\n", reg, val[0], reg_get_mask(reg)); + } + + free(reg_list); +} + +int main(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + get_writable_masks(vm); + dump_regs(vcpu); + kvm_vm_free(vm); +} -- 2.42.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel