Commit 99cdc6c1 authored by Anup Patel's avatar Anup Patel Committed by Anup Patel
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RISC-V: Add initial skeletal KVM support 



This patch adds initial skeletal KVM RISC-V support which has:
1. A simple implementation of arch specific VM functions
   except kvm_vm_ioctl_get_dirty_log() which will implemeted
   in-future as part of stage2 page loging.
2. Stubs of required arch specific VCPU functions except
   kvm_arch_vcpu_ioctl_run() which is semi-complete and
   extended by subsequent patches.
3. Stubs for required arch specific stage2 MMU functions.

Signed-off-by: default avatarAnup Patel <anup.patel@wdc.com>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarAlexander Graf <graf@amazon.com>
Acked-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 3f2401f4

arch/riscv/Kconfig

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@@ -562,4 +562,5 @@ source "kernel/power/Kconfig" 


endmenu



source "arch/riscv/kvm/Kconfig"

source "drivers/firmware/Kconfig"

arch/riscv/Makefile

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@@ -100,6 +100,7 @@ endif 
head-y := arch/riscv/kernel/head.o



core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/

core-$(CONFIG_KVM) += arch/riscv/kvm/



libs-y += arch/riscv/lib/

libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

arch/riscv/include/asm/kvm_host.h

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/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (C) 2019 Western Digital Corporation or its affiliates.

 *

 * Authors:

 *     Anup Patel <anup.patel@wdc.com>

 */



#ifndef __RISCV_KVM_HOST_H__

#define __RISCV_KVM_HOST_H__



#include <linux/types.h>

#include <linux/kvm.h>

#include <linux/kvm_types.h>



#ifdef CONFIG_64BIT

#define KVM_MAX_VCPUS			(1U << 16)

#else

#define KVM_MAX_VCPUS			(1U << 9)

#endif



#define KVM_HALT_POLL_NS_DEFAULT	500000



#define KVM_VCPU_MAX_FEATURES		0



#define KVM_REQ_SLEEP \

	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)

#define KVM_REQ_VCPU_RESET		KVM_ARCH_REQ(1)



struct kvm_vm_stat {

	struct kvm_vm_stat_generic generic;

};



struct kvm_vcpu_stat {

	struct kvm_vcpu_stat_generic generic;

	u64 ecall_exit_stat;

	u64 wfi_exit_stat;

	u64 mmio_exit_user;

	u64 mmio_exit_kernel;

	u64 exits;

};



struct kvm_arch_memory_slot {

};



struct kvm_arch {

	/* stage2 page table */

	pgd_t *pgd;

	phys_addr_t pgd_phys;

};



struct kvm_cpu_trap {

	unsigned long sepc;

	unsigned long scause;

	unsigned long stval;

	unsigned long htval;

	unsigned long htinst;

};



struct kvm_vcpu_arch {

	/* Don't run the VCPU (blocked) */

	bool pause;



	/* SRCU lock index for in-kernel run loop */

	int srcu_idx;

};



static inline void kvm_arch_hardware_unsetup(void) {}

static inline void kvm_arch_sync_events(struct kvm *kvm) {}

static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}

static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}



void kvm_riscv_stage2_flush_cache(struct kvm_vcpu *vcpu);

int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm);

void kvm_riscv_stage2_free_pgd(struct kvm *kvm);

void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu);



int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);

int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,

			struct kvm_cpu_trap *trap);



static inline void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch) {}



#endif /* __RISCV_KVM_HOST_H__ */

arch/riscv/include/asm/kvm_types.h

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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_RISCV_KVM_TYPES_H

#define _ASM_RISCV_KVM_TYPES_H



#define KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE 40



#endif /* _ASM_RISCV_KVM_TYPES_H */

arch/riscv/include/uapi/asm/kvm.h

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

/*

 * Copyright (C) 2019 Western Digital Corporation or its affiliates.

 *

 * Authors:

 *     Anup Patel <anup.patel@wdc.com>

 */



#ifndef __LINUX_KVM_RISCV_H

#define __LINUX_KVM_RISCV_H



#ifndef __ASSEMBLY__



#include <linux/types.h>

#include <asm/ptrace.h>



#define __KVM_HAVE_READONLY_MEM



#define KVM_COALESCED_MMIO_PAGE_OFFSET 1



/* for KVM_GET_REGS and KVM_SET_REGS */

struct kvm_regs {

};



/* for KVM_GET_FPU and KVM_SET_FPU */

struct kvm_fpu {

};



/* KVM Debug exit structure */

struct kvm_debug_exit_arch {

};



/* for KVM_SET_GUEST_DEBUG */

struct kvm_guest_debug_arch {

};



/* definition of registers in kvm_run */

struct kvm_sync_regs {

};



/* dummy definition */

struct kvm_sregs {

};



#endif



#endif /* __LINUX_KVM_RISCV_H */