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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5f05a72aed
The fault decoding process (including computing the IPA in the case of a permission fault) would be much better done in C code, as we have a reasonable infrastructure to deal with the VHE/non-VHE differences. Let's move the whole thing to C, including the workaround for erratum 834220, and just patch the odd ESR_EL2 access remaining in hyp-entry.S. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
176 lines
3.9 KiB
ArmAsm
176 lines
3.9 KiB
ArmAsm
/*
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* Copyright (C) 2015 - 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/alternative.h>
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#include <asm/assembler.h>
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#include <asm/cpufeature.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_mmu.h>
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.text
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.pushsection .hyp.text, "ax"
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.macro save_x0_to_x3
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stp x0, x1, [sp, #-16]!
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stp x2, x3, [sp, #-16]!
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.endm
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.macro restore_x0_to_x3
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ldp x2, x3, [sp], #16
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ldp x0, x1, [sp], #16
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.endm
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.macro do_el2_call
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/*
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* Shuffle the parameters before calling the function
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* pointed to in x0. Assumes parameters in x[1,2,3].
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*/
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sub sp, sp, #16
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str lr, [sp]
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mov lr, x0
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mov x0, x1
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mov x1, x2
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mov x2, x3
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blr lr
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ldr lr, [sp]
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add sp, sp, #16
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.endm
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ENTRY(__vhe_hyp_call)
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do_el2_call
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/*
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* We used to rely on having an exception return to get
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* an implicit isb. In the E2H case, we don't have it anymore.
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* rather than changing all the leaf functions, just do it here
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* before returning to the rest of the kernel.
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*/
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isb
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ret
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ENDPROC(__vhe_hyp_call)
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el1_sync: // Guest trapped into EL2
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save_x0_to_x3
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alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
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mrs x1, esr_el2
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alternative_else
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mrs x1, esr_el1
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alternative_endif
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lsr x2, x1, #ESR_ELx_EC_SHIFT
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cmp x2, #ESR_ELx_EC_HVC64
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b.ne el1_trap
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mrs x3, vttbr_el2 // If vttbr is valid, the 64bit guest
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cbnz x3, el1_trap // called HVC
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/* Here, we're pretty sure the host called HVC. */
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restore_x0_to_x3
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/* Check for __hyp_get_vectors */
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cbnz x0, 1f
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mrs x0, vbar_el2
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b 2f
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1:
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/*
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* Perform the EL2 call
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*/
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kern_hyp_va x0
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do_el2_call
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2: eret
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el1_trap:
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/*
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* x1: ESR
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* x2: ESR_EC
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*/
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/* Guest accessed VFP/SIMD registers, save host, restore Guest */
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cmp x2, #ESR_ELx_EC_FP_ASIMD
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b.eq __fpsimd_guest_restore
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mrs x0, tpidr_el2
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mov x1, #ARM_EXCEPTION_TRAP
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b __guest_exit
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el1_irq:
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save_x0_to_x3
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mrs x0, tpidr_el2
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mov x1, #ARM_EXCEPTION_IRQ
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b __guest_exit
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ENTRY(__hyp_do_panic)
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mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
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PSR_MODE_EL1h)
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msr spsr_el2, lr
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ldr lr, =panic
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msr elr_el2, lr
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eret
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ENDPROC(__hyp_do_panic)
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.macro invalid_vector label, target = __hyp_panic
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.align 2
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\label:
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b \target
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ENDPROC(\label)
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.endm
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/* None of these should ever happen */
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invalid_vector el2t_sync_invalid
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invalid_vector el2t_irq_invalid
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invalid_vector el2t_fiq_invalid
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invalid_vector el2t_error_invalid
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invalid_vector el2h_sync_invalid
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invalid_vector el2h_irq_invalid
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invalid_vector el2h_fiq_invalid
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invalid_vector el2h_error_invalid
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invalid_vector el1_sync_invalid
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invalid_vector el1_irq_invalid
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invalid_vector el1_fiq_invalid
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invalid_vector el1_error_invalid
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.ltorg
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.align 11
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ENTRY(__kvm_hyp_vector)
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ventry el2t_sync_invalid // Synchronous EL2t
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ventry el2t_irq_invalid // IRQ EL2t
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ventry el2t_fiq_invalid // FIQ EL2t
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ventry el2t_error_invalid // Error EL2t
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ventry el2h_sync_invalid // Synchronous EL2h
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ventry el2h_irq_invalid // IRQ EL2h
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ventry el2h_fiq_invalid // FIQ EL2h
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ventry el2h_error_invalid // Error EL2h
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ventry el1_sync // Synchronous 64-bit EL1
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ventry el1_irq // IRQ 64-bit EL1
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ventry el1_fiq_invalid // FIQ 64-bit EL1
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ventry el1_error_invalid // Error 64-bit EL1
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ventry el1_sync // Synchronous 32-bit EL1
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ventry el1_irq // IRQ 32-bit EL1
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ventry el1_fiq_invalid // FIQ 32-bit EL1
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ventry el1_error_invalid // Error 32-bit EL1
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ENDPROC(__kvm_hyp_vector)
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