These macros should be used to avoid repeating the context save and restore sequences. Signed-off-by: Andrew Scull <ascull@xxxxxxxxxx> --- arch/arm64/include/asm/kvm_asm.h | 39 +++++++++++++++++++++++++++++ arch/arm64/kvm/hyp/entry.S | 39 ----------------------------- arch/arm64/kvm/hyp/nvhe/hyp-start.S | 2 -- 3 files changed, 39 insertions(+), 41 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index ff27c18b9fd6..1b2c718fa58f 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -212,6 +212,45 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ]; add \reg, \reg, #HOST_DATA_CONTEXT .endm +#define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) +#define CPU_LR_OFFSET CPU_XREG_OFFSET(30) +#define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8) + +/* + * We treat x18 as callee-saved as the host may use it as a platform + * register (e.g. for shadow call stack). + */ +.macro save_callee_saved_regs ctxt + str x18, [\ctxt, #CPU_XREG_OFFSET(18)] + stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] + stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] + stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] + stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] + stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] + stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] +.endm + +.macro restore_callee_saved_regs ctxt + // We require \ctxt is not x18-x28 + ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] + ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] + ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] + ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] + ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] + ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] + ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] +.endm + +.macro save_sp_el0 ctxt, tmp + mrs \tmp, sp_el0 + str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] +.endm + +.macro restore_sp_el0 ctxt, tmp + ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] + msr sp_el0, \tmp +.endm + #endif #endif /* __ARM_KVM_ASM_H__ */ diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index da349c152791..63d484059c01 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -7,7 +7,6 @@ #include <linux/linkage.h> #include <asm/alternative.h> -#include <asm/asm-offsets.h> #include <asm/assembler.h> #include <asm/fpsimdmacros.h> #include <asm/kvm.h> @@ -16,46 +15,8 @@ #include <asm/kvm_mmu.h> #include <asm/kvm_ptrauth.h> -#define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) -#define CPU_SP_EL0_OFFSET (CPU_XREG_OFFSET(30) + 8) - .text -/* - * We treat x18 as callee-saved as the host may use it as a platform - * register (e.g. for shadow call stack). - */ -.macro save_callee_saved_regs ctxt - str x18, [\ctxt, #CPU_XREG_OFFSET(18)] - stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] - stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] - stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] - stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] - stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] - stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] -.endm - -.macro restore_callee_saved_regs ctxt - // We require \ctxt is not x18-x28 - ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] - ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] - ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] - ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] - ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] - ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] - ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] -.endm - -.macro save_sp_el0 ctxt, tmp - mrs \tmp, sp_el0 - str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] -.endm - -.macro restore_sp_el0 ctxt, tmp - ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] - msr sp_el0, \tmp -.endm - /* * u64 __guest_enter(struct kvm_vcpu *vcpu, * struct kvm_cpu_context *host_ctxt); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-start.S b/arch/arm64/kvm/hyp/nvhe/hyp-start.S index dd955e022963..d7744dcfd184 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-start.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp-start.S @@ -13,8 +13,6 @@ #include <asm/kvm_asm.h> #include <asm/kvm_ptrauth.h> -#define CPU_LR_OFFSET (CPU_USER_PT_REGS + (8 * 30)) - /* * Initialize ptrauth in the hyp ctxt by populating it with the keys of the * host, which are the keys currently installed. -- 2.27.0.389.gc38d7665816-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
