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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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96e5e670cc
Similar to the arm64 version, add the code that deals with VFP traps, re-enabling VFP, save/restoring the registers and resuming the guest. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
102 lines
2.5 KiB
ArmAsm
102 lines
2.5 KiB
ArmAsm
/*
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* Copyright (C) 2016 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/kvm_arm.h>
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.arch_extension virt
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.text
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.pushsection .hyp.text, "ax"
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#define USR_REGS_OFFSET (CPU_CTXT_GP_REGS + GP_REGS_USR)
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/* int __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host) */
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ENTRY(__guest_enter)
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@ Save host registers
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add r1, r1, #(USR_REGS_OFFSET + S_R4)
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stm r1!, {r4-r12}
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str lr, [r1, #4] @ Skip SP_usr (already saved)
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@ Restore guest registers
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add r0, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R0)
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ldr lr, [r0, #S_LR]
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ldm r0, {r0-r12}
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clrex
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eret
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ENDPROC(__guest_enter)
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ENTRY(__guest_exit)
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/*
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* return convention:
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* guest r0, r1, r2 saved on the stack
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* r0: vcpu pointer
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* r1: exception code
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*/
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add r2, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R3)
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stm r2!, {r3-r12}
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str lr, [r2, #4]
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add r2, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R0)
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pop {r3, r4, r5} @ r0, r1, r2
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stm r2, {r3-r5}
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ldr r0, [r0, #VCPU_HOST_CTXT]
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add r0, r0, #(USR_REGS_OFFSET + S_R4)
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ldm r0!, {r4-r12}
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ldr lr, [r0, #4]
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mov r0, r1
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bx lr
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ENDPROC(__guest_exit)
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/*
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* If VFPv3 support is not available, then we will not switch the VFP
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* registers; however cp10 and cp11 accesses will still trap and fallback
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* to the regular coprocessor emulation code, which currently will
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* inject an undefined exception to the guest.
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*/
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#ifdef CONFIG_VFPv3
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ENTRY(__vfp_guest_restore)
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push {r3, r4, lr}
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@ NEON/VFP used. Turn on VFP access.
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mrc p15, 4, r1, c1, c1, 2 @ HCPTR
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bic r1, r1, #(HCPTR_TCP(10) | HCPTR_TCP(11))
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mcr p15, 4, r1, c1, c1, 2 @ HCPTR
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isb
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@ Switch VFP/NEON hardware state to the guest's
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mov r4, r0
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ldr r0, [r0, #VCPU_HOST_CTXT]
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add r0, r0, #CPU_CTXT_VFP
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bl __vfp_save_state
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add r0, r4, #(VCPU_GUEST_CTXT + CPU_CTXT_VFP)
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bl __vfp_restore_state
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pop {r3, r4, lr}
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pop {r0, r1, r2}
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clrex
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eret
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ENDPROC(__vfp_guest_restore)
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#endif
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.popsection
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