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ad72e59ff2
The existing arm64 hcall implementations are limited in that they only
allow for two distinct hcalls; with the x0 register either zero or not
zero. Also, the API of the hyp-stub exception vector routines and the
KVM exception vector routines differ; hyp-stub uses a non-zero value in
x0 to implement __hyp_set_vectors, whereas KVM uses it to implement
kvm_call_hyp.
To allow for additional hcalls to be defined and to make the arm64 hcall
API more consistent across exception vector routines, change the hcall
implementations to reserve all x0 values below 0xfff for hcalls such
as {s,g}et_vectors().
Define two new preprocessor macros HVC_GET_VECTORS, and HVC_SET_VECTORS
to be used as hcall type specifiers and convert the existing
__hyp_get_vectors() and __hyp_set_vectors() routines to use these new
macros when executing an HVC call. Also, change the corresponding
hyp-stub and KVM el1_sync exception vector routines to use these new
macros.
Signed-off-by: Geoff Levand <geoff@infradead.org>
[Merged two hcall patches, moved immediate value from esr to x0, use lr
as a scratch register, changed limit to 0xfff]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
173 lines
3.9 KiB
ArmAsm
173 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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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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.endm
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ENTRY(__vhe_hyp_call)
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str lr, [sp, #-16]!
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do_el2_call
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ldr lr, [sp], #16
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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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cmp x0, #HVC_GET_VECTORS
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b.ne 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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