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| author |  Steven Price <steven.price@arm.com>
| 2021-06-21 12:17:13 +0100 |
|---|---|---|
| committer |  Marc Zyngier <maz@kernel.org>
| 2021-06-22 14:08:05 +0100 |
| commit | e1f358b5046479d2897f23b1d5b092687c6e7a67 (patch) | |
| tree | 2b99e61386b7a7c63bb55cc694b8787dce8a00c1 /arch/arm64/include/asm/kvm_mte.h | |
| parent | KVM: arm64: Introduce MTE VM feature (diff) | |
| download | linux-e1f358b5046479d2897f23b1d5b092687c6e7a67.tar.gz linux-e1f358b5046479d2897f23b1d5b092687c6e7a67.tar.bz2 linux-e1f358b5046479d2897f23b1d5b092687c6e7a67.zip | |
KVM: arm64: Save/restore MTE registers
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210621111716.37157-4-steven.price@arm.com
Diffstat (limited to 'arch/arm64/include/asm/kvm_mte.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_mte.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_mte.h b/arch/arm64/include/asm/kvm_mte.h new file mode 100644 index 000000000000..de002636eb1f --- /dev/null +++ b/arch/arm64/include/asm/kvm_mte.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2021 ARM Ltd. + */ +#ifndef __ASM_KVM_MTE_H +#define __ASM_KVM_MTE_H + +#ifdef __ASSEMBLY__ + +#include <asm/sysreg.h> + +#ifdef CONFIG_ARM64_MTE + +.macro mte_switch_to_guest g_ctxt, h_ctxt, reg1 +alternative_if_not ARM64_MTE + b .L__skip_switch\@ +alternative_else_nop_endif + mrs \reg1, hcr_el2 + tbz \reg1, #(HCR_ATA_SHIFT), .L__skip_switch\@ + + mrs_s \reg1, SYS_RGSR_EL1 + str \reg1, [\h_ctxt, #CPU_RGSR_EL1] + mrs_s \reg1, SYS_GCR_EL1 + str \reg1, [\h_ctxt, #CPU_GCR_EL1] + + ldr \reg1, [\g_ctxt, #CPU_RGSR_EL1] + msr_s SYS_RGSR_EL1, \reg1 + ldr \reg1, [\g_ctxt, #CPU_GCR_EL1] + msr_s SYS_GCR_EL1, \reg1 + +.L__skip_switch\@: +.endm + +.macro mte_switch_to_hyp g_ctxt, h_ctxt, reg1 +alternative_if_not ARM64_MTE + b .L__skip_switch\@ +alternative_else_nop_endif + mrs \reg1, hcr_el2 + tbz \reg1, #(HCR_ATA_SHIFT), .L__skip_switch\@ + + mrs_s \reg1, SYS_RGSR_EL1 + str \reg1, [\g_ctxt, #CPU_RGSR_EL1] + mrs_s \reg1, SYS_GCR_EL1 + str \reg1, [\g_ctxt, #CPU_GCR_EL1] + + ldr \reg1, [\h_ctxt, #CPU_RGSR_EL1] + msr_s SYS_RGSR_EL1, \reg1 + ldr \reg1, [\h_ctxt, #CPU_GCR_EL1] + msr_s SYS_GCR_EL1, \reg1 + + isb + +.L__skip_switch\@: +.endm + +#else /* !CONFIG_ARM64_MTE */ + +.macro mte_switch_to_guest g_ctxt, h_ctxt, reg1 +.endm + +.macro mte_switch_to_hyp g_ctxt, h_ctxt, reg1 +.endm + +#endif /* CONFIG_ARM64_MTE */ +#endif /* __ASSEMBLY__ */ +#endif /* __ASM_KVM_MTE_H */ |