From: David Brazdil <dbrazdil@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Marc Zyngier <maz@kernel.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>
Cc: kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, David Brazdil <dbrazdil@google.com>
Subject: [PATCH v2 02/14] arm64: kvm: Move __smccc_workaround_1_smc to .rodata
Date: Fri, 15 May 2020 11:58:29 +0100 [thread overview]
Message-ID: <20200515105841.73532-3-dbrazdil@google.com> (raw)
In-Reply-To: <20200515105841.73532-1-dbrazdil@google.com>
This snippet of assembly is used by cpu_errata.c to overwrite parts of KVM hyp
vector. Move it to its own source file and change its ELF section to .rodata.
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/kvm/hyp/Makefile | 1 +
arch/arm64/kvm/hyp/hyp-entry.S | 16 ----------------
arch/arm64/kvm/hyp/smccc_wa.S | 30 ++++++++++++++++++++++++++++++
3 files changed, 31 insertions(+), 16 deletions(-)
create mode 100644 arch/arm64/kvm/hyp/smccc_wa.S
diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index 8c9880783839..5d8357ddc234 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -7,6 +7,7 @@ ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING \
$(DISABLE_STACKLEAK_PLUGIN)
obj-$(CONFIG_KVM) += hyp.o
+obj-$(CONFIG_KVM_INDIRECT_VECTORS) += smccc_wa.o
hyp-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 hyp-entry.o
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index c2a13ab3c471..65ff99a7e02d 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -319,20 +319,4 @@ SYM_CODE_START(__bp_harden_hyp_vecs)
1: .org __bp_harden_hyp_vecs + __BP_HARDEN_HYP_VECS_SZ
.org 1b
SYM_CODE_END(__bp_harden_hyp_vecs)
-
- .popsection
-
-SYM_CODE_START(__smccc_workaround_1_smc)
- esb
- sub sp, sp, #(8 * 4)
- stp x2, x3, [sp, #(8 * 0)]
- stp x0, x1, [sp, #(8 * 2)]
- mov w0, #ARM_SMCCC_ARCH_WORKAROUND_1
- smc #0
- ldp x2, x3, [sp, #(8 * 0)]
- ldp x0, x1, [sp, #(8 * 2)]
- add sp, sp, #(8 * 4)
-1: .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ
- .org 1b
-SYM_CODE_END(__smccc_workaround_1_smc)
#endif
diff --git a/arch/arm64/kvm/hyp/smccc_wa.S b/arch/arm64/kvm/hyp/smccc_wa.S
new file mode 100644
index 000000000000..aa25b5428e77
--- /dev/null
+++ b/arch/arm64/kvm/hyp/smccc_wa.S
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015-2018 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/arm-smccc.h>
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+
+ /*
+ * This is not executed directly and is instead copied into the vectors
+ * by install_bp_hardening_cb().
+ */
+ .data
+ .pushsection .rodata
+ .global __smccc_workaround_1_smc
+__smccc_workaround_1_smc:
+ esb
+ sub sp, sp, #(8 * 4)
+ stp x2, x3, [sp, #(8 * 0)]
+ stp x0, x1, [sp, #(8 * 2)]
+ mov w0, #ARM_SMCCC_ARCH_WORKAROUND_1
+ smc #0
+ ldp x2, x3, [sp, #(8 * 0)]
+ ldp x0, x1, [sp, #(8 * 2)]
+ add sp, sp, #(8 * 4)
+1: .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ
+ .org 1b
--
2.26.2
next prev parent reply other threads:[~2020-05-15 10:59 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 10:58 [PATCH v2 00/14] Split off nVHE hyp code David Brazdil
2020-05-15 10:58 ` [PATCH v2 01/14] arm64: kvm: Fix symbol dependency in __hyp_call_panic_nvhe David Brazdil
2020-05-15 10:58 ` David Brazdil [this message]
2020-05-15 10:58 ` [PATCH v2 03/14] arm64: kvm: Formalize hypcall ABI David Brazdil
2020-05-15 10:58 ` [PATCH v2 04/14] arm64: kvm: Add build rules for separate nVHE object files David Brazdil
2020-05-18 15:55 ` Andrew Scull
2020-05-18 16:42 ` David Brazdil
2020-05-15 10:58 ` [PATCH v2 05/14] arm64: kvm: Build hyp-entry.S separately for VHE/nVHE David Brazdil
2020-05-15 10:58 ` [PATCH v2 06/14] arm64: kvm: Split hyp/tlb.c to VHE/nVHE David Brazdil
2020-05-15 10:58 ` [PATCH v2 07/14] arm64: kvm: Split hyp/switch.c " David Brazdil
2020-05-18 15:28 ` Andrew Scull
2020-05-18 16:44 ` David Brazdil
2020-05-15 10:58 ` [PATCH v2 08/14] arm64: kvm: Split hyp/debug-sr.c " David Brazdil
2020-05-15 10:58 ` [PATCH v2 09/14] arm64: kvm: Split hyp/sysreg-sr.c " David Brazdil
2020-05-15 10:58 ` [PATCH v2 10/14] arm64: kvm: Split hyp/timer-sr.c " David Brazdil
2020-05-15 10:58 ` [PATCH v2 11/14] arm64: kvm: Compile remaining hyp/ files for both VHE/nVHE David Brazdil
2020-05-15 10:58 ` [PATCH v2 12/14] arm64: kvm: Add comments around __kvm_nvhe_ symbol aliases David Brazdil
2020-05-15 10:58 ` [PATCH v2 13/14] arm64: kvm: Remove __hyp_text macro, use build rules instead David Brazdil
2020-05-15 10:58 ` [PATCH v2 14/14] arm64: kvm: Lift instrumentation restrictions on VHE David Brazdil
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