2012-12-18 00:07:52 +07:00
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/*
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* Copyright (C) 2012,2013 - 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/assembler.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_mmu.h>
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2015-03-19 23:42:28 +07:00
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#include <asm/pgtable-hwdef.h>
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2016-04-27 23:47:01 +07:00
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#include <asm/sysreg.h>
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2017-04-04 01:37:40 +07:00
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#include <asm/virt.h>
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2012-12-18 00:07:52 +07:00
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.text
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.pushsection .hyp.idmap.text, "ax"
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.align 11
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ENTRY(__kvm_hyp_init)
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ventry __invalid // Synchronous EL2t
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ventry __invalid // IRQ EL2t
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ventry __invalid // FIQ EL2t
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ventry __invalid // Error EL2t
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ventry __invalid // Synchronous EL2h
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ventry __invalid // IRQ EL2h
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ventry __invalid // FIQ EL2h
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ventry __invalid // Error EL2h
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ventry __do_hyp_init // Synchronous 64-bit EL1
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ventry __invalid // IRQ 64-bit EL1
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ventry __invalid // FIQ 64-bit EL1
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ventry __invalid // Error 64-bit EL1
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ventry __invalid // Synchronous 32-bit EL1
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ventry __invalid // IRQ 32-bit EL1
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ventry __invalid // FIQ 32-bit EL1
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ventry __invalid // Error 32-bit EL1
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__invalid:
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b .
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/*
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2016-07-01 00:40:44 +07:00
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* x0: HYP pgd
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* x1: HYP stack
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* x2: HYP vectors
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2012-12-18 00:07:52 +07:00
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*/
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__do_hyp_init:
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2017-04-04 01:37:40 +07:00
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/* Check for a stub HVC call */
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cmp x0, #HVC_STUB_HCALL_NR
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b.lo __kvm_handle_stub_hvc
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2012-12-18 00:07:52 +07:00
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2017-12-14 00:07:18 +07:00
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phys_to_ttbr x0, x4
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msr ttbr0_el2, x4
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2012-12-18 00:07:52 +07:00
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mrs x4, tcr_el1
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ldr x5, =TCR_EL2_MASK
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and x4, x4, x5
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2016-02-11 01:46:53 +07:00
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mov x5, #TCR_EL2_RES1
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2012-12-18 00:07:52 +07:00
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orr x4, x4, x5
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2015-03-19 23:42:28 +07:00
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#ifndef CONFIG_ARM64_VA_BITS_48
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/*
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* If we are running with VA_BITS < 48, we may be running with an extra
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* level of translation in the ID map. This is only the case if system
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* RAM is out of range for the currently configured page size and number
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* of translation levels, in which case we will also need the extra
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* level for the HYP ID map, or we won't be able to enable the EL2 MMU.
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*
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* However, at EL2, there is only one TTBR register, and we can't switch
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* between translation tables *and* update TCR_EL2.T0SZ at the same
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* time. Bottom line: we need the extra level in *both* our translation
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* tables.
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*
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* So use the same T0SZ value we use for the ID map.
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*/
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ldr_l x5, idmap_t0sz
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bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
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#endif
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2014-03-07 15:49:25 +07:00
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/*
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2017-12-14 00:07:17 +07:00
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* Set the PS bits in TCR_EL2.
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2014-03-07 15:49:25 +07:00
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*/
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2017-12-14 00:07:17 +07:00
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tcr_compute_pa_size x4, #TCR_EL2_PS_SHIFT, x5, x6
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2016-02-11 01:46:53 +07:00
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msr tcr_el2, x4
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2012-12-18 00:07:52 +07:00
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mrs x4, mair_el1
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msr mair_el2, x4
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isb
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2014-07-31 13:53:23 +07:00
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/* Invalidate the stale TLBs from Bootloader */
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tlbi alle2
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dsb sy
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2017-06-07 01:08:33 +07:00
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/*
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* Preserve all the RES1 bits while setting the default flags,
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2017-06-07 01:08:34 +07:00
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* as well as the EE bit on BE. Drop the A flag since the compiler
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* is allowed to generate unaligned accesses.
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2017-06-07 01:08:33 +07:00
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*/
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2017-06-07 01:08:34 +07:00
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ldr x4, =(SCTLR_EL2_RES1 | (SCTLR_ELx_FLAGS & ~SCTLR_ELx_A))
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2017-06-07 01:08:33 +07:00
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CPU_BE( orr x4, x4, #SCTLR_ELx_EE)
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2012-12-18 00:07:52 +07:00
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msr sctlr_el2, x4
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isb
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/* Set the stack and new vectors */
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2016-07-01 00:40:44 +07:00
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kern_hyp_va x1
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mov sp, x1
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2012-12-18 00:07:52 +07:00
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kern_hyp_va x2
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2016-07-01 00:40:44 +07:00
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msr vbar_el2, x2
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2012-12-18 00:07:52 +07:00
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/* Hello, World! */
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eret
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ENDPROC(__kvm_hyp_init)
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2017-04-04 01:37:40 +07:00
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ENTRY(__kvm_handle_stub_hvc)
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2017-04-04 01:38:04 +07:00
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cmp x0, #HVC_SOFT_RESTART
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2017-04-04 01:37:44 +07:00
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b.ne 1f
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/* This is where we're about to jump, staying at EL2 */
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msr elr_el2, x1
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mov x0, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT | PSR_MODE_EL2h)
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msr spsr_el2, x0
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/* Shuffle the arguments, and don't come back */
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mov x0, x2
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mov x1, x3
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mov x2, x4
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b reset
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2017-04-04 01:37:41 +07:00
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1: cmp x0, #HVC_RESET_VECTORS
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2017-04-04 01:37:40 +07:00
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b.ne 1f
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2017-04-04 01:37:44 +07:00
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reset:
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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/*
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2017-04-04 01:37:44 +07:00
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* Reset kvm back to the hyp stub. Do not clobber x0-x4 in
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* case we coming via HVC_SOFT_RESTART.
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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*/
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2017-04-04 01:37:44 +07:00
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mrs x5, sctlr_el2
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ldr x6, =SCTLR_ELx_FLAGS
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bic x5, x5, x6 // Clear SCTL_M and etc
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msr sctlr_el2, x5
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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isb
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/* Install stub vectors */
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2017-04-04 01:37:44 +07:00
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adr_l x5, __hyp_stub_vectors
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msr vbar_el2, x5
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2017-04-04 01:38:05 +07:00
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mov x0, xzr
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eret
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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2017-04-04 01:37:40 +07:00
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1: /* Bad stub call */
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ldr x0, =HVC_STUB_ERR
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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eret
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2017-04-04 01:38:05 +07:00
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2017-04-04 01:37:40 +07:00
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ENDPROC(__kvm_handle_stub_hvc)
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arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
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>
2016-04-27 23:47:05 +07:00
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2012-12-18 00:07:52 +07:00
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.ltorg
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.popsection
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