From: David Brazdil <dbrazdil@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@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, linux-kernel@vger.kernel.org,
kernel-team@google.com, kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/9] kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars
Date: Wed, 22 Jul 2020 17:44:19 +0100 [thread overview]
Message-ID: <20200722164424.42225-5-dbrazdil@google.com> (raw)
In-Reply-To: <20200722164424.42225-1-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 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
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next prev parent reply other threads:[~2020-07-22 16:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 16:44 [PATCH 0/9] Independent per-CPU data section for nVHE David Brazdil
2020-07-22 16:44 ` [PATCH 1/9] Macros to override naming of percpu symbols and sections David Brazdil
2020-07-22 16:44 ` [PATCH 2/9] kvm: arm64: Remove __hyp_this_cpu_read David Brazdil
2020-07-22 16:44 ` [PATCH 3/9] kvm: arm64: Remove hyp_adr/ldr_this_cpu David Brazdil
2020-07-22 16:44 ` David Brazdil [this message]
2020-07-22 16:44 ` [PATCH 5/9] kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp David Brazdil
2020-07-22 16:44 ` [PATCH 6/9] kvm: arm64: Create separate instances of kvm_host_data for VHE/nVHE David Brazdil
2020-07-22 16:44 ` [PATCH 7/9] kvm: arm64: Mark hyp stack pages reserved David Brazdil
2020-07-22 16:44 ` [PATCH 8/9] kvm: arm64: Set up hyp percpu data for nVHE David Brazdil
2020-07-22 16:44 ` [PATCH 9/9] kvm: arm64: Remove unnecessary hyp mappings David Brazdil
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