mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 14:36:46 +07:00
f9076ecfb1
Commit 68234df4ea ("arm64: kill flush_cache_all()") removed the global
arm64 routines cpu_reset() and cpu_soft_restart() needed by the arm64
kexec and kdump support. Add back a simplified version of
cpu_soft_restart() with some changes needed for kexec in the new files
cpu_reset.S, and cpu_reset.h.
When a CPU is reset it needs to be put into the exception level it had when
it entered the kernel. Update cpu_soft_restart() to accept an argument
which signals if the reset address should be entered at EL1 or EL2, and
add a new hypercall HVC_SOFT_RESTART which is used for the EL2 switch.
Signed-off-by: Geoff Levand <geoff@infradead.org>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
140 lines
3.6 KiB
ArmAsm
140 lines
3.6 KiB
ArmAsm
/*
|
|
* Hypervisor stub
|
|
*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/irqchip/arm-gic-v3.h>
|
|
|
|
#include <asm/assembler.h>
|
|
#include <asm/kvm_arm.h>
|
|
#include <asm/kvm_asm.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/virt.h>
|
|
|
|
.text
|
|
.align 11
|
|
|
|
ENTRY(__hyp_stub_vectors)
|
|
ventry el2_sync_invalid // Synchronous EL2t
|
|
ventry el2_irq_invalid // IRQ EL2t
|
|
ventry el2_fiq_invalid // FIQ EL2t
|
|
ventry el2_error_invalid // Error EL2t
|
|
|
|
ventry el2_sync_invalid // Synchronous EL2h
|
|
ventry el2_irq_invalid // IRQ EL2h
|
|
ventry el2_fiq_invalid // FIQ EL2h
|
|
ventry el2_error_invalid // Error EL2h
|
|
|
|
ventry el1_sync // Synchronous 64-bit EL1
|
|
ventry el1_irq_invalid // IRQ 64-bit EL1
|
|
ventry el1_fiq_invalid // FIQ 64-bit EL1
|
|
ventry el1_error_invalid // Error 64-bit EL1
|
|
|
|
ventry el1_sync_invalid // Synchronous 32-bit EL1
|
|
ventry el1_irq_invalid // IRQ 32-bit EL1
|
|
ventry el1_fiq_invalid // FIQ 32-bit EL1
|
|
ventry el1_error_invalid // Error 32-bit EL1
|
|
ENDPROC(__hyp_stub_vectors)
|
|
|
|
.align 11
|
|
|
|
el1_sync:
|
|
mrs x30, esr_el2
|
|
lsr x30, x30, #ESR_ELx_EC_SHIFT
|
|
|
|
cmp x30, #ESR_ELx_EC_HVC64
|
|
b.ne 9f // Not an HVC trap
|
|
|
|
cmp x0, #HVC_GET_VECTORS
|
|
b.ne 1f
|
|
mrs x0, vbar_el2
|
|
b 9f
|
|
|
|
1: cmp x0, #HVC_SET_VECTORS
|
|
b.ne 2f
|
|
msr vbar_el2, x1
|
|
b 9f
|
|
|
|
2: cmp x0, #HVC_SOFT_RESTART
|
|
b.ne 3f
|
|
mov x0, x2
|
|
mov x2, x4
|
|
mov x4, x1
|
|
mov x1, x3
|
|
br x4 // no return
|
|
|
|
/* Someone called kvm_call_hyp() against the hyp-stub... */
|
|
3: mov x0, #ARM_EXCEPTION_HYP_GONE
|
|
|
|
9: eret
|
|
ENDPROC(el1_sync)
|
|
|
|
.macro invalid_vector label
|
|
\label:
|
|
b \label
|
|
ENDPROC(\label)
|
|
.endm
|
|
|
|
invalid_vector el2_sync_invalid
|
|
invalid_vector el2_irq_invalid
|
|
invalid_vector el2_fiq_invalid
|
|
invalid_vector el2_error_invalid
|
|
invalid_vector el1_sync_invalid
|
|
invalid_vector el1_irq_invalid
|
|
invalid_vector el1_fiq_invalid
|
|
invalid_vector el1_error_invalid
|
|
|
|
/*
|
|
* __hyp_set_vectors: Call this after boot to set the initial hypervisor
|
|
* vectors as part of hypervisor installation. On an SMP system, this should
|
|
* be called on each CPU.
|
|
*
|
|
* x0 must be the physical address of the new vector table, and must be
|
|
* 2KB aligned.
|
|
*
|
|
* Before calling this, you must check that the stub hypervisor is installed
|
|
* everywhere, by waiting for any secondary CPUs to be brought up and then
|
|
* checking that is_hyp_mode_available() is true.
|
|
*
|
|
* If not, there is a pre-existing hypervisor, some CPUs failed to boot, or
|
|
* something else went wrong... in such cases, trying to install a new
|
|
* hypervisor is unlikely to work as desired.
|
|
*
|
|
* When you call into your shiny new hypervisor, sp_el2 will contain junk,
|
|
* so you will need to set that to something sensible at the new hypervisor's
|
|
* initialisation entry point.
|
|
*/
|
|
|
|
ENTRY(__hyp_get_vectors)
|
|
str lr, [sp, #-16]!
|
|
mov x0, #HVC_GET_VECTORS
|
|
hvc #0
|
|
ldr lr, [sp], #16
|
|
ret
|
|
ENDPROC(__hyp_get_vectors)
|
|
|
|
ENTRY(__hyp_set_vectors)
|
|
str lr, [sp, #-16]!
|
|
mov x1, x0
|
|
mov x0, #HVC_SET_VECTORS
|
|
hvc #0
|
|
ldr lr, [sp], #16
|
|
ret
|
|
ENDPROC(__hyp_set_vectors)
|