1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Library for managing various aspects of guests 4 * 5 * Copyright (c) 2021 IBM Corp 6 * 7 * Authors: 8 * Janosch Frank <frankja@linux.ibm.com> 9 */ 10 11 #include <asm/barrier.h> 12 #include <libcflat.h> 13 #include <sie.h> 14 #include <asm/page.h> 15 #include <libcflat.h> 16 #include <alloc_page.h> 17 18 static bool validity_expected; 19 static uint16_t vir; /* Validity interception reason */ 20 21 void sie_expect_validity(void) 22 { 23 validity_expected = true; 24 vir = 0; 25 } 26 27 void sie_check_validity(uint16_t vir_exp) 28 { 29 report(vir_exp == vir, "VALIDITY: %x", vir); 30 vir = 0; 31 } 32 33 void sie_handle_validity(struct vm *vm) 34 { 35 if (vm->sblk->icptcode != ICPT_VALIDITY) 36 return; 37 38 vir = vm->sblk->ipb >> 16; 39 40 if (!validity_expected) 41 report_abort("VALIDITY: %x", vir); 42 validity_expected = false; 43 } 44 45 void sie(struct vm *vm) 46 { 47 /* Reset icptcode so we don't trip over it below */ 48 vm->sblk->icptcode = 0; 49 50 while (vm->sblk->icptcode == 0) { 51 sie64a(vm->sblk, &vm->save_area); 52 sie_handle_validity(vm); 53 } 54 vm->save_area.guest.grs[14] = vm->sblk->gg14; 55 vm->save_area.guest.grs[15] = vm->sblk->gg15; 56 } 57 58 /* Initializes the struct vm members like the SIE control block. */ 59 void sie_guest_create(struct vm *vm, uint64_t guest_mem, uint64_t guest_mem_len) 60 { 61 vm->sblk = alloc_page(); 62 memset(vm->sblk, 0, PAGE_SIZE); 63 vm->sblk->cpuflags = CPUSTAT_ZARCH | CPUSTAT_RUNNING; 64 vm->sblk->ihcpu = 0xffff; 65 vm->sblk->prefix = 0; 66 67 /* Guest memory chunks are always 1MB */ 68 assert(!(guest_mem_len & ~HPAGE_MASK)); 69 /* Currently MSO/MSL is the easiest option */ 70 vm->sblk->mso = (uint64_t)guest_mem; 71 vm->sblk->msl = (uint64_t)guest_mem + ((guest_mem_len - 1) & HPAGE_MASK); 72 73 /* CRYCB needs to be in the first 2GB */ 74 vm->crycb = alloc_pages_flags(0, AREA_DMA31); 75 vm->sblk->crycbd = (uint32_t)(uintptr_t)vm->crycb; 76 } 77 78 /* Frees the memory that was gathered on initialization */ 79 void sie_guest_destroy(struct vm *vm) 80 { 81 free_page(vm->crycb); 82 free_page(vm->sblk); 83 } 84