d5d8184d35
This commit introduces the framework for guest memory management through the use of 2nd stage translation. Each VM has a pointer to a level-1 table (the pgd field in struct kvm_arch) which is used for the 2nd stage translations. Entries are added when handling guest faults (later patch) and the table itself can be allocated and freed through the following functions implemented in arch/arm/kvm/arm_mmu.c: - kvm_alloc_stage2_pgd(struct kvm *kvm); - kvm_free_stage2_pgd(struct kvm *kvm); Each entry in TLBs and caches are tagged with a VMID identifier in addition to ASIDs. The VMIDs are assigned consecutively to VMs in the order that VMs are executed, and caches and tlbs are invalidated when the VMID space has been used to allow for more than 255 simultaenously running guests. The 2nd stage pgd is allocated in kvm_arch_init_vm(). The table is freed in kvm_arch_destroy_vm(). Both functions are called from the main KVM code. We pre-allocate page table memory to be able to synchronize using a spinlock and be called under rcu_read_lock from the MMU notifiers. We steal the mmu_memory_cache implementation from x86 and adapt for our specific usage. We support MMU notifiers (thanks to Marc Zyngier) through kvm_unmap_hva and kvm_set_spte_hva. Finally, define kvm_phys_addr_ioremap() to map a device at a guest IPA, which is used by VGIC support to map the virtual CPU interface registers to the guest. This support is added by Marc Zyngier. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
89 lines
2.7 KiB
ArmAsm
89 lines
2.7 KiB
ArmAsm
/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/linkage.h>
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#include <linux/const.h>
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#include <asm/unified.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_arm.h>
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.text
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__kvm_hyp_code_start:
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.globl __kvm_hyp_code_start
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/********************************************************************
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* Flush per-VMID TLBs
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*/
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ENTRY(__kvm_tlb_flush_vmid)
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bx lr
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ENDPROC(__kvm_tlb_flush_vmid)
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/********************************************************************
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* Flush TLBs and instruction caches of current CPU for all VMIDs
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*/
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ENTRY(__kvm_flush_vm_context)
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bx lr
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ENDPROC(__kvm_flush_vm_context)
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/********************************************************************
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* Hypervisor world-switch code
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*/
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ENTRY(__kvm_vcpu_run)
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bx lr
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/********************************************************************
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* Call function in Hyp mode
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*
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*
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* u64 kvm_call_hyp(void *hypfn, ...);
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*
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* This is not really a variadic function in the classic C-way and care must
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* be taken when calling this to ensure parameters are passed in registers
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* only, since the stack will change between the caller and the callee.
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*
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* Call the function with the first argument containing a pointer to the
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* function you wish to call in Hyp mode, and subsequent arguments will be
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* passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the
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* function pointer can be passed). The function being called must be mapped
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* in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are
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* passed in r0 and r1.
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*
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* The calling convention follows the standard AAPCS:
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* r0 - r3: caller save
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* r12: caller save
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* rest: callee save
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*/
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ENTRY(kvm_call_hyp)
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hvc #0
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bx lr
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/********************************************************************
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* Hypervisor exception vector and handlers
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*/
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.align 5
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__kvm_hyp_vector:
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.globl __kvm_hyp_vector
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nop
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__kvm_hyp_code_end:
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.globl __kvm_hyp_code_end
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