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Wed, 22 Jul 2020 09:45:05 -0700 (PDT) From: David Brazdil To: Catalin Marinas , Will Deacon , Marc Zyngier , Dennis Zhou , Tejun Heo , Christoph Lameter , Arnd Bergmann Subject: [PATCH 4/9] kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars Date: Wed, 22 Jul 2020 17:44:19 +0100 Message-Id: <20200722164424.42225-5-dbrazdil@google.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200722164424.42225-1-dbrazdil@google.com> References: <20200722164424.42225-1-dbrazdil@google.com> MIME-Version: 1.0 Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@google.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.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 Defining a per-CPU variable in hyp/nvhe will result in its name being prefixed with __kvm_nvhe_. Add helpers for declaring these variables in kernel proper and accessing them with this_cpu_ptr and per_cpu_ptr. Signed-off-by: David Brazdil --- arch/arm64/include/asm/kvm_asm.h | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index bbd14e205aba..3d69cab873e4 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -60,9 +60,21 @@ DECLARE_KVM_VHE_SYM(sym); \ DECLARE_KVM_NVHE_SYM(sym) +#define DECLARE_KVM_VHE_PER_CPU(type, sym) \ + DECLARE_PER_CPU(type, sym) +#define DECLARE_KVM_NVHE_PER_CPU(type, sym) \ + DECLARE_PER_CPU(type, kvm_nvhe_sym(sym)) + +#define DECLARE_KVM_HYP_PER_CPU(type, sym) \ + DECLARE_KVM_VHE_PER_CPU(type, sym); \ + DECLARE_KVM_NVHE_PER_CPU(type, sym) + #define CHOOSE_VHE_SYM(sym) sym #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) +#define this_cpu_ptr_nvhe(sym) this_cpu_ptr(&kvm_nvhe_sym(sym)) +#define per_cpu_ptr_nvhe(sym, cpu) per_cpu_ptr(&kvm_nvhe_sym(sym), cpu) + #ifndef __KVM_NVHE_HYPERVISOR__ /* * BIG FAT WARNINGS: @@ -75,12 +87,21 @@ * - Don't let the nVHE hypervisor have access to this, as it will * pick the *wrong* symbol (yes, it runs at EL2...). */ -#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() ? CHOOSE_VHE_SYM(sym) \ +#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \ + ? CHOOSE_VHE_SYM(sym) \ : CHOOSE_NVHE_SYM(sym)) +#define this_cpu_ptr_hyp(sym) (is_kernel_in_hyp_mode() \ + ? this_cpu_ptr(&sym) \ + : this_cpu_ptr_nvhe(sym)) +#define per_cpu_ptr_hyp(sym, cpu) (is_kernel_in_hyp_mode() \ + ? per_cpu_ptr(&sym, cpu) \ + : per_cpu_ptr_nvhe(sym, cpu)) #else /* The nVHE hypervisor shouldn't even try to access anything */ extern void *__nvhe_undefined_symbol; -#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol +#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol +#define this_cpu_ptr_hyp(sym) &__nvhe_undefined_symbol +#define per_cpu_ptr_hyp(sym, cpu) &__nvhe_undefined_symbol #endif /* Translate a kernel address @ptr into its equivalent linear mapping */ -- 2.27.0 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm