path: root/arch/s390/kvm/vsie.c

// SPDX-License-Identifier: GPL-2.0
/*
 * kvm nested virtualization support for s390x
 *
 * Copyright IBM Corp. 2016, 2018
 *
 *    Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
 */
#include <linux/vmalloc.h>
#include <linux/kvm_host.h>
#include <linux/bug.h>
#include <linux/list.h>
#include <linux/bitmap.h>
#include <linux/sched/signal.h>

#include <asm/gmap.h>
#include <asm/mmu_context.h>
#include <asm/sclp.h>
#include <asm/nmi.h>
#include <asm/dis.h>
#include "kvm-s390.h"
#include "gaccess.h"

struct vsie_page {
	struct kvm_s390_sie_block scb_s;	/* 0x0000 */
	/*
	 * the backup info for machine check. ensure it's at
	 * the same offset as that in struct sie_page!
	 */
	struct mcck_volatile_info mcck_info;    /* 0x0200 */
	/*
	 * The pinned original scb. Be aware that other VCPUs can modify
	 * it while we read from it. Values that are used for conditions or
	 * are reused conditionally, should be accessed via READ_ONCE.
	 */
	struct kvm_s390_sie_block *scb_o;	/* 0x0218 */
	/* the shadow gmap in use by the vsie_page */
	struct gmap *gmap;			/* 0x0220 */
	/* address of the last reported fault to guest2 */
	unsigned long fault_addr;		/* 0x0228 */
	/* calculated guest addresses of satellite control blocks */
	gpa_t sca_gpa;				/* 0x0230 */
	gpa_t itdba_gpa;			/* 0x0238 */
	gpa_t gvrd_gpa;				/* 0x0240 */
	gpa_t riccbd_gpa;			/* 0x0248 */
	gpa_t sdnx_gpa;				/* 0x0250 */
	__u8 reserved[0x0700 - 0x0258];		/* 0x0258 */
	struct kvm_s390_crypto_cb crycb;	/* 0x0700 */
	__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE];	/* 0x0800 */
};

/* trigger a validity icpt for the given scb */
static int set_validity_icpt(struct kvm_s390_sie_block *scb,
			     __u16 reason_code)
{
	scb->ipa = 0x1000;
	scb->ipb = ((__u32) reason_code) << 16;
	scb->i