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From: David Brazdil <dbrazdil@google.com>
To: Marc Zyngier <maz@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Dennis Zhou <dennis@kernel.org>,
	Tejun Heo <tj@kernel.org>, Christoph Lameter <cl@linux.com>,
	Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	David Brazdil <dbrazdil@google.com>,
	kernel-team@android.com, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 05/10] kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars
Date: Thu,  3 Sep 2020 11:17:07 +0200	[thread overview]
Message-ID: <20200903091712.46456-6-dbrazdil@google.com> (raw)
In-Reply-To: <20200903091712.46456-1-dbrazdil@google.com>

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 <dbrazdil@google.com>
---
 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 469c0662f7f3..2b89817cdb01 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 */
-- 
2.28.0.402.g5ffc5be6b7-goog


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  parent reply	other threads:[~2020-09-03  9:19 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-03  9:17 [PATCH v2 00/10] Independent per-CPU data section for nVHE David Brazdil
2020-09-03  9:17 ` [PATCH v2 01/10] Macros to override naming of percpu symbols and sections David Brazdil
2020-09-03  9:17 ` [PATCH v2 02/10] kvm: arm64: Partially link nVHE hyp code, simplify HYPCOPY David Brazdil
2020-09-10  9:54   ` Andrew Scull
2020-09-14 13:09   ` Will Deacon
2020-09-03  9:17 ` [PATCH v2 03/10] kvm: arm64: Remove __hyp_this_cpu_read David Brazdil
2020-09-10 11:12   ` Andrew Scull
2020-09-17  8:34     ` David Brazdil
2020-09-03  9:17 ` [PATCH v2 04/10] kvm: arm64: Remove hyp_adr/ldr_this_cpu David Brazdil
2020-09-10 12:34   ` Andrew Scull
2020-09-03  9:17 ` David Brazdil [this message]
2020-09-03  9:17 ` [PATCH v2 06/10] kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp David Brazdil
2020-09-03  9:17 ` [PATCH v2 07/10] kvm: arm64: Create separate instances of kvm_host_data for VHE/nVHE David Brazdil
2020-09-03  9:17 ` [PATCH v2 08/10] kvm: arm64: Mark hyp stack pages reserved David Brazdil
2020-09-03  9:17 ` [PATCH v2 09/10] kvm: arm64: Set up hyp percpu data for nVHE David Brazdil
2020-09-03  9:17 ` [PATCH v2 10/10] kvm: arm64: Remove unnecessary hyp mappings David Brazdil
2020-09-10 14:07   ` Andrew Scull
2020-09-16 13:35     ` David Brazdil
2020-09-14 17:40 ` [PATCH v2 00/10] Independent per-CPU data section for nVHE Will Deacon
2020-09-16 11:54   ` David Brazdil
2020-09-16 12:24     ` David Brazdil
2020-09-16 12:39       ` Will Deacon
2020-09-16 12:40         ` David Brazdil

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