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 3/9] kvm: arm64: Remove hyp_adr/ldr_this_cpu
Date: Wed, 22 Jul 2020 17:44:18 +0100 [thread overview]
Message-ID: <20200722164424.42225-4-dbrazdil@google.com> (raw)
In-Reply-To: <20200722164424.42225-1-dbrazdil@google.com>
The hyp_adr/ldr_this_cpu helpers were introduced for use in hyp code because
they always needed to use TPIDR_EL2 for base, while adr/ldr_this_cpu from
kernel proper would select between TPIDR_EL2 and _EL1 based on VHE/nVHE.
Simplify this now that the nVHE hyp mode case can be handled using the
__KVM_NVHE_HYPERVISOR__ macro. VHE hyp code selects _EL2 with alternatives.
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/assembler.h | 27 +++++++++++++++++----------
arch/arm64/include/asm/kvm_asm.h | 14 +-------------
arch/arm64/kvm/hyp/hyp-entry.S | 2 +-
3 files changed, 19 insertions(+), 24 deletions(-)
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 54d181177656..b392a977efb6 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -218,6 +218,21 @@ lr .req x30 // link register
str \src, [\tmp, :lo12:\sym]
.endm
+ /*
+ * @dst: destination register (32 or 64 bit wide)
+ */
+ .macro this_cpu_offset, dst
+#ifdef __KVM_NVHE_HYPERVISOR__
+ mrs \dst, tpidr_el2
+#else
+alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
+ mrs \dst, tpidr_el1
+alternative_else
+ mrs \dst, tpidr_el2
+alternative_endif
+#endif
+ .endm
+
/*
* @dst: Result of per_cpu(sym, smp_processor_id()) (can be SP)
* @sym: The name of the per-cpu variable
@@ -226,11 +241,7 @@ lr .req x30 // link register
.macro adr_this_cpu, dst, sym, tmp
adrp \tmp, \sym
add \dst, \tmp, #:lo12:\sym
-alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
- mrs \tmp, tpidr_el1
-alternative_else
- mrs \tmp, tpidr_el2
-alternative_endif
+ this_cpu_offset \tmp
add \dst, \dst, \tmp
.endm
@@ -241,11 +252,7 @@ alternative_endif
*/
.macro ldr_this_cpu dst, sym, tmp
adr_l \dst, \sym
-alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
- mrs \tmp, tpidr_el1
-alternative_else
- mrs \tmp, tpidr_el2
-alternative_endif
+ this_cpu_offset \tmp
ldr \dst, [\dst, \tmp]
.endm
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index da4a0826cacd..bbd14e205aba 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -151,20 +151,8 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
#else /* __ASSEMBLY__ */
-.macro hyp_adr_this_cpu reg, sym, tmp
- adr_l \reg, \sym
- mrs \tmp, tpidr_el2
- add \reg, \reg, \tmp
-.endm
-
-.macro hyp_ldr_this_cpu reg, sym, tmp
- adr_l \reg, \sym
- mrs \tmp, tpidr_el2
- ldr \reg, [\reg, \tmp]
-.endm
-
.macro get_host_ctxt reg, tmp
- hyp_adr_this_cpu \reg, kvm_host_data, \tmp
+ adr_this_cpu \reg, kvm_host_data, \tmp
add \reg, \reg, #HOST_DATA_CONTEXT
.endm
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 689fccbc9de7..0a0cb1d3acd3 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -108,7 +108,7 @@ alternative_cb_end
str x0, [x2, #VCPU_WORKAROUND_FLAGS]
/* Check that we actually need to perform the call */
- hyp_ldr_this_cpu x0, arm64_ssbd_callback_required, x2
+ ldr_this_cpu x0, arm64_ssbd_callback_required, x2
cbz x0, wa2_end
mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2
--
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 ` David Brazdil [this message]
2020-07-22 16:44 ` [PATCH 4/9] kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars David Brazdil
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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