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Thu, 30 Apr 2020 07:48:51 -0700 (PDT) From: David Brazdil To: Catalin Marinas , James Morse , Julien Thierry , Marc Zyngier , Suzuki K Poulose , Will Deacon Subject: [PATCH 04/15] arm64: kvm: Add build rules for separate nVHE object files Date: Thu, 30 Apr 2020 15:48:20 +0100 Message-Id: <20200430144831.59194-5-dbrazdil@google.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200430144831.59194-1-dbrazdil@google.com> References: <20200430144831.59194-1-dbrazdil@google.com> MIME-Version: 1.0 Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Add new folder arch/arm64/kvm/hyp/nvhe and a Makefile for building code that runs in EL2 under nVHE KVM. Compile each source file into a `.hyp.tmp.o` object first, then prefix all its symbols with "__hyp_text_" using `objcopy` and produce a `.hyp.o`. Suffixes were chosen so that it would be possible for VHE and nVHE to share some source files, but compiled with different CFLAGS. nVHE build rules add -D__HYPERVISOR__. Macros are added for prefixing a nVHE symbol name when referenced from kernel proper. Signed-off-by: David Brazdil --- arch/arm64/include/asm/kvm_asm.h | 13 ++++++++++++ arch/arm64/kernel/image-vars.h | 12 +++++++++++ arch/arm64/kvm/hyp/Makefile | 4 ++-- arch/arm64/kvm/hyp/nvhe/Makefile | 35 ++++++++++++++++++++++++++++++++ scripts/kallsyms.c | 1 + 5 files changed, 63 insertions(+), 2 deletions(-) create mode 100644 arch/arm64/kvm/hyp/nvhe/Makefile diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 7c7eeeaab9fa..99ab204519ca 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -42,6 +42,12 @@ #include +/* Translate the name of @sym to its nVHE equivalent. */ +#define kvm_nvhe_sym(sym) __hyp_text_##sym + +/* Choose between VHE and nVHE variants of a symbol. */ +#define kvm_hyp_sym(sym) (has_vhe() ? sym : kvm_nvhe_sym(sym)) + /* Translate a kernel address of @sym into its equivalent linear mapping */ #define kvm_ksym_ref(sym) \ ({ \ @@ -51,6 +57,13 @@ val; \ }) +/* + * Translate a kernel address of @sym into its equivalent linear mapping, + * choosing between VHE and nVHE variant of @sym accordingly. + */ +#define kvm_hyp_ref(sym) \ + (has_vhe() ? kvm_ksym_ref(sym) : kvm_ksym_ref(kvm_nvhe_sym(sym))) + struct kvm; struct kvm_vcpu; diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 7f06ad93fc95..13850134fc28 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -51,4 +51,16 @@ __efistub__ctype = _ctype; #endif +#ifdef CONFIG_KVM + +/* + * KVM nVHE code has its own symbol namespace prefixed by __hyp_text_, to + * isolate it from the kernel proper. The following symbols are legally + * accessed by it, therefore provide aliases to make them linkable. + * Do not include symbols which may not be safely accessed under hypervisor + * memory mappings. + */ + +#endif /* CONFIG_KVM */ + #endif /* __ARM64_KERNEL_IMAGE_VARS_H */ diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index 29e2b2cd2fbc..79bf822a484b 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile @@ -6,9 +6,9 @@ ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING \ $(DISABLE_STACKLEAK_PLUGIN) -obj-$(CONFIG_KVM) += hyp.o +obj-$(CONFIG_KVM) += vhe.o nvhe/ -hyp-y := vgic-v3-sr.o timer-sr.o aarch32.o vgic-v2-cpuif-proxy.o sysreg-sr.o \ +vhe-y := vgic-v3-sr.o timer-sr.o aarch32.o vgic-v2-cpuif-proxy.o sysreg-sr.o \ debug-sr.o entry.o switch.o fpsimd.o tlb.o host_hypercall.o hyp-entry.o # KVM code is run at a different exception code with a different map, so diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile new file mode 100644 index 000000000000..873d3ab0fd68 --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part +# + +asflags-y := -D__HYPERVISOR__ +ccflags-y := -D__HYPERVISOR__ -fno-stack-protector -DDISABLE_BRANCH_PROFILING \ + $(DISABLE_STACKLEAK_PLUGIN) + +obj-y := + +obj-y := $(patsubst %.o,%.hyp.o,$(obj-y)) +extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y)) + +$(obj)/%.hyp.tmp.o: $(src)/%.c FORCE + $(call if_changed_rule,cc_o_c) +$(obj)/%.hyp.tmp.o: $(src)/%.S FORCE + $(call if_changed_rule,as_o_S) +$(obj)/%.hyp.o: $(obj)/%.hyp.tmp.o FORCE + $(call if_changed,hypcopy) + +quiet_cmd_hypcopy = HYPCOPY $@ + cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__hyp_text_ $< $@ + +# KVM nVHE code is run at a different exception code with a different map, so +# compiler instrumentation that inserts callbacks or checks into the code may +# cause crashes. Just disable it. +GCOV_PROFILE := n +KASAN_SANITIZE := n +UBSAN_SANITIZE := n +KCOV_INSTRUMENT := n + +# Skip objtool checking for this directory because nVHE code is compiled with +# non-standard build rules. +OBJECT_FILES_NON_STANDARD := y diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c index 3e8dea6e0a95..b5c9dc6de38d 100644 --- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -109,6 +109,7 @@ static bool is_ignored_symbol(const char *name, char type) ".LASANPC", /* s390 kasan local symbols */ "__crc_", /* modversions */ "__efistub_", /* arm64 EFI stub namespace */ + "__hyp_text_", /* arm64 non-VHE KVM namespace */ NULL }; -- 2.26.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm