Commit 6d6ec20f authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: KVM: Implement system register save/restore 



Implement the system register save/restore as a direct translation of
the assembly code version.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 1431af36

arch/arm64/kvm/hyp/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ 
obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o

obj-$(CONFIG_KVM_ARM_HOST) += vgic-v3-sr.o

obj-$(CONFIG_KVM_ARM_HOST) += timer-sr.o

obj-$(CONFIG_KVM_ARM_HOST) += sysreg-sr.o

arch/arm64/kvm/hyp/hyp.h

+3 −0
Original line number Diff line number Diff line
@@ -38,5 +38,8 @@ void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); 
void __timer_save_state(struct kvm_vcpu *vcpu);

void __timer_restore_state(struct kvm_vcpu *vcpu);



void __sysreg_save_state(struct kvm_cpu_context *ctxt);

void __sysreg_restore_state(struct kvm_cpu_context *ctxt);



#endif /* __ARM64_KVM_HYP_H__ */

arch/arm64/kvm/hyp/sysreg-sr.c

0 → 100644
+90 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2012-2015 - 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/compiler.h>

#include <linux/kvm_host.h>



#include <asm/kvm_mmu.h>



#include "hyp.h"



/* ctxt is already in the HYP VA space */

void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)

{

	ctxt->sys_regs[MPIDR_EL1]	= read_sysreg(vmpidr_el2);

	ctxt->sys_regs[CSSELR_EL1]	= read_sysreg(csselr_el1);

	ctxt->sys_regs[SCTLR_EL1]	= read_sysreg(sctlr_el1);

	ctxt->sys_regs[ACTLR_EL1]	= read_sysreg(actlr_el1);

	ctxt->sys_regs[CPACR_EL1]	= read_sysreg(cpacr_el1);

	ctxt->sys_regs[TTBR0_EL1]	= read_sysreg(ttbr0_el1);

	ctxt->sys_regs[TTBR1_EL1]	= read_sysreg(ttbr1_el1);

	ctxt->sys_regs[TCR_EL1]		= read_sysreg(tcr_el1);

	ctxt->sys_regs[ESR_EL1]		= read_sysreg(esr_el1);

	ctxt->sys_regs[AFSR0_EL1]	= read_sysreg(afsr0_el1);

	ctxt->sys_regs[AFSR1_EL1]	= read_sysreg(afsr1_el1);

	ctxt->sys_regs[FAR_EL1]		= read_sysreg(far_el1);

	ctxt->sys_regs[MAIR_EL1]	= read_sysreg(mair_el1);

	ctxt->sys_regs[VBAR_EL1]	= read_sysreg(vbar_el1);

	ctxt->sys_regs[CONTEXTIDR_EL1]	= read_sysreg(contextidr_el1);

	ctxt->sys_regs[TPIDR_EL0]	= read_sysreg(tpidr_el0);

	ctxt->sys_regs[TPIDRRO_EL0]	= read_sysreg(tpidrro_el0);

	ctxt->sys_regs[TPIDR_EL1]	= read_sysreg(tpidr_el1);

	ctxt->sys_regs[AMAIR_EL1]	= read_sysreg(amair_el1);

	ctxt->sys_regs[CNTKCTL_EL1]	= read_sysreg(cntkctl_el1);

	ctxt->sys_regs[PAR_EL1]		= read_sysreg(par_el1);

	ctxt->sys_regs[MDSCR_EL1]	= read_sysreg(mdscr_el1);



	ctxt->gp_regs.regs.sp		= read_sysreg(sp_el0);

	ctxt->gp_regs.regs.pc		= read_sysreg(elr_el2);

	ctxt->gp_regs.regs.pstate	= read_sysreg(spsr_el2);

	ctxt->gp_regs.sp_el1		= read_sysreg(sp_el1);

	ctxt->gp_regs.elr_el1		= read_sysreg(elr_el1);

	ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg(spsr_el1);

}



void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)

{

	write_sysreg(ctxt->sys_regs[MPIDR_EL1],	  vmpidr_el2);

	write_sysreg(ctxt->sys_regs[CSSELR_EL1],  csselr_el1);

	write_sysreg(ctxt->sys_regs[SCTLR_EL1],	  sctlr_el1);

	write_sysreg(ctxt->sys_regs[ACTLR_EL1],	  actlr_el1);

	write_sysreg(ctxt->sys_regs[CPACR_EL1],	  cpacr_el1);

	write_sysreg(ctxt->sys_regs[TTBR0_EL1],	  ttbr0_el1);

	write_sysreg(ctxt->sys_regs[TTBR1_EL1],	  ttbr1_el1);

	write_sysreg(ctxt->sys_regs[TCR_EL1],	  tcr_el1);

	write_sysreg(ctxt->sys_regs[ESR_EL1],	  esr_el1);

	write_sysreg(ctxt->sys_regs[AFSR0_EL1],	  afsr0_el1);

	write_sysreg(ctxt->sys_regs[AFSR1_EL1],	  afsr1_el1);

	write_sysreg(ctxt->sys_regs[FAR_EL1],	  far_el1);

	write_sysreg(ctxt->sys_regs[MAIR_EL1],	  mair_el1);

	write_sysreg(ctxt->sys_regs[VBAR_EL1],	  vbar_el1);

	write_sysreg(ctxt->sys_regs[CONTEXTIDR_EL1], contextidr_el1);

	write_sysreg(ctxt->sys_regs[TPIDR_EL0],	  tpidr_el0);

	write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0);

	write_sysreg(ctxt->sys_regs[TPIDR_EL1],	  tpidr_el1);

	write_sysreg(ctxt->sys_regs[AMAIR_EL1],	  amair_el1);

	write_sysreg(ctxt->sys_regs[CNTKCTL_EL1], cntkctl_el1);

	write_sysreg(ctxt->sys_regs[PAR_EL1],	  par_el1);

	write_sysreg(ctxt->sys_regs[MDSCR_EL1],	  mdscr_el1);



	write_sysreg(ctxt->gp_regs.regs.sp,	sp_el0);

	write_sysreg(ctxt->gp_regs.regs.pc,	elr_el2);

	write_sysreg(ctxt->gp_regs.regs.pstate,	spsr_el2);

	write_sysreg(ctxt->gp_regs.sp_el1,	sp_el1);

	write_sysreg(ctxt->gp_regs.elr_el1,	elr_el1);

	write_sysreg(ctxt->gp_regs.spsr[KVM_SPSR_EL1], spsr_el1);

}

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