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255 lines
6.9 KiB
C
255 lines
6.9 KiB
C
/*
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* tests.c: HVM environment tests.
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*
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* Copyright (c) 2008, Citrix Systems, Inc.
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*
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* Authors:
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* Keir Fraser <keir@xen.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include "util.h"
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#define TEST_FAIL 0
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#define TEST_PASS 1
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#define TEST_SKIP 2
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/*
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* Memory layout during tests:
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* 4MB to 8MB is cleared.
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* Page directory resides at 8MB.
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* 4 page table pages reside at 8MB+4kB to 8MB+20kB.
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* Pagetables identity-map 0-16MB, except 4kB at va 6MB maps to pa 5MB.
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*/
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#define PD_START (8ul << 20)
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#define PT_START (PD_START + 4096)
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static void setup_paging(void)
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{
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uint32_t *pd = (uint32_t *)PD_START;
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uint32_t *pt = (uint32_t *)PT_START;
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uint32_t i;
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/* Identity map 0-16MB. */
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for ( i = 0; i < 4; i++ )
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pd[i] = (unsigned long)pt + (i<<12) + 3;
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for ( i = 0; i < (4*1024); i++ )
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pt[i] = (i << 12) + 3;
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/* Page at virtual 6MB maps to physical 5MB. */
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pt[6u<<8] -= 0x100000u;
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}
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static void start_paging(void)
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{
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asm volatile (
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"mov %%eax,%%cr3; mov %%cr0,%%eax; "
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"orl $0x80000000,%%eax; mov %%eax,%%cr0; "
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"jmp 1f; 1:"
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: : "a" (PD_START) : "memory" );
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}
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static void stop_paging(void)
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{
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asm volatile (
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"mov %%cr0,%%eax; andl $0x7fffffff,%%eax; mov %%eax,%%cr0; "
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"jmp 1f; 1:"
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: : : "eax", "memory" );
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}
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/*
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* rep_io_test: Tests REP INSB both forwards and backwards (EF.DF={0,1}) across
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* a discontiguous page boundary.
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*/
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static int rep_io_test(void)
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{
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uint32_t *p;
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uint32_t i, p0, p1, p2;
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int okay = TEST_PASS;
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static const struct {
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unsigned long addr;
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uint32_t expected;
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} check[] = {
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{ 0x00500000, 0x987654ff },
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{ 0x00500ffc, 0xff000000 },
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{ 0x005ffffc, 0xff000000 },
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{ 0x00601000, 0x000000ff },
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{ 0, 0 }
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};
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start_paging();
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/* Phys 5MB = 0xdeadbeef */
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*(uint32_t *)0x500000ul = 0xdeadbeef;
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/* Phys 5MB = 0x98765432 */
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*(uint32_t *)0x600000ul = 0x98765432;
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/* Phys 0x5fffff = Phys 0x500000 = 0xff (byte) */
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asm volatile (
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"rep insb"
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: "=d" (p0), "=c" (p1), "=D" (p2)
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: "0" (0x5f), "1" (2), "2" (0x5ffffful) : "memory" );
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/* Phys 0x500fff = Phys 0x601000 = 0xff (byte) */
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asm volatile (
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"std ; rep insb ; cld"
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: "=d" (p0), "=c" (p1), "=D" (p2)
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: "0" (0x5f), "1" (2), "2" (0x601000ul) : "memory" );
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stop_paging();
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i = 0;
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for ( p = (uint32_t *)0x400000ul; p < (uint32_t *)0x700000ul; p++ )
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{
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uint32_t expected = 0;
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if ( check[i].addr == (unsigned long)p )
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{
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expected = check[i].expected;
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i++;
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}
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if ( *p != expected )
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{
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printf("Bad value at 0x%08lx: saw %08x expected %08x\n",
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(unsigned long)p, *p, expected);
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okay = TEST_FAIL;
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}
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}
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return okay;
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}
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static int shadow_gs_test(void)
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{
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uint64_t *pd = (uint64_t *)PD_START;
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uint32_t i, eax, ebx, ecx, edx;
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/* Skip this test if the CPU does not support long mode. */
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cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
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if ( eax < 0x80000001 )
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return TEST_SKIP;
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cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
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if ( !(edx & (1u<<29)) )
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return TEST_SKIP;
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/* Long mode pagetable setup: Identity map 0-16MB with 2MB mappings. */
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*pd = (unsigned long)pd + 0x1007; /* Level 4 */
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pd += 512;
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*pd = (unsigned long)pd + 0x1007; /* Level 3 */
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pd += 512;
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for ( i = 0; i < 8; i++ ) /* Level 2 */
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*pd++ = (i << 21) + 0x1e3;
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asm volatile (
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/* CR4.PAE=1 */
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"mov $0x20,%%ebx; "
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"mov %%ebx,%%cr4; "
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/* CR3 */
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"mov %%eax,%%cr3; "
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/* EFER.LME=1 */
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"mov $0xc0000080,%%ecx; rdmsr; btsl $8,%%eax; wrmsr; "
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/* CR0.PG=1 */
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"mov %%cr0,%%eax; btsl $31,%%eax; mov %%eax,%%cr0; "
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"jmp 1f; 1: "
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/* GS_BASE=2; SHADOW_GS_BASE=3 */
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"mov $0xc0000101,%%ecx; xor %%edx,%%edx; mov $2,%%eax; wrmsr; "
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"mov $0xc0000102,%%ecx; xor %%edx,%%edx; mov $3,%%eax; wrmsr; "
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/* Push LRETQ stack frame. */
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"pushl $0; pushl $"STR(SEL_CODE32)"; pushl $0; pushl $2f; "
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/* Jump to 64-bit mode. */
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"ljmp $"STR(SEL_CODE64)",$1f; 1: "
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/* Swap GS_BASE and SHADOW_GS_BASE */
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".byte 0x0f,0x01,0xf8; " /* SWAPGS */
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/* Jump to 32-bit mode. */
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".byte 0x89, 0xe4; " /* MOV ESP,ESP */
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".byte 0x48, 0xcb; 2: " /* LRETQ */
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/* Read SHADOW_GS_BASE: should now contain 2 */
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"mov $0xc0000102,%%ecx; rdmsr; mov %%eax,%%ebx; "
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/* CR0.PG=0 */
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"mov %%cr0,%%eax; btcl $31,%%eax; mov %%eax,%%cr0; "
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"jmp 1f; 1:"
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/* EFER.LME=0 */
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"mov $0xc0000080,%%ecx; rdmsr; btcl $8,%%eax; wrmsr; "
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/* CR4.PAE=0 */
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"xor %%eax,%%eax; mov %%eax,%%cr4; "
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: "=b" (ebx) : "a" (PD_START) : "ecx", "edx", "memory" );
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return (ebx == 2) ? TEST_PASS : TEST_FAIL;
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}
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void perform_tests(void)
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{
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int i, passed, skipped;
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static struct {
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int (* const test)(void);
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const char *description;
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} tests[] = {
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{ rep_io_test, "REP INSB across page boundaries" },
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{ shadow_gs_test, "GS base MSRs and SWAPGS" },
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{ NULL, NULL }
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};
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printf("Testing HVM environment:\n");
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if ( hvm_info->low_mem_pgend < 0x1000 )
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{
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printf("Skipping tests due to insufficient memory (<16MB)\n");
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return;
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}
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passed = skipped = 0;
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for ( i = 0; tests[i].test; i++ )
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{
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printf(" - %s ... ", tests[i].description);
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memset((char *)(4ul << 20), 0, 4ul << 20);
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setup_paging();
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switch ( (*tests[i].test)() )
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{
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case TEST_PASS:
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printf("passed\n");
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passed++;
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break;
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case TEST_FAIL:
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printf("failed\n");
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break;
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case TEST_SKIP:
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printf("skipped\n");
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skipped++;
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break;
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}
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}
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printf("Passed %d of %d tests\n", passed, i);
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if ( skipped != 0 )
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printf("Skipped %d of %d tests\n", skipped, i);
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if ( (passed + skipped) != i )
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{
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printf("FAILED %d of %d tests\n", i - passed - skipped, i);
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BUG();
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}
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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