Unbreak large mem support by removing kqemu

kqemu introduces a number of restrictions on the i386 target.  The worst is that
it prevents large memory from working in the default build.

Furthermore, kqemu is fundamentally flawed in a number of ways.  It relies on
the TSC as a time source which will not be reliable on a multiple processor
system in userspace.  Since most modern processors are multicore, this severely
limits the utility of kqemu.

kvm is a viable alternative for people looking to accelerate qemu and has the
benefit of being supported by the upstream Linux kernel.  If someone can
implement work arounds to remove the restrictions introduced by kqemu, I'm
happy to avoid and/or revert this patch.

N.B. kqemu will still function in the 0.11 series but this patch removes it from
the 0.12 series.

Paul, please Ack or Nack this patch.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 0 insertions, 998 deletions

diff --git a/kqemu.c b/kqemu.c
deleted file mode 100644
index 5611bc8946..0000000000
--- a/kqemu.c
+++ /dev/null
@@ -1,998 +0,0 @@
-/*
- *  KQEMU support
- *
- *  Copyright (c) 2005-2008 Fabrice Bellard
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-#include "config.h"
-#ifdef _WIN32
-#include <windows.h>
-#include <winioctl.h>
-#else
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <sys/ioctl.h>
-#endif
-#ifdef CONFIG_SOLARIS
-#include <sys/ioccom.h>
-#endif
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#include "cpu.h"
-#include "exec-all.h"
-#include "qemu-common.h"
-
-#ifdef CONFIG_KQEMU
-
-#define DEBUG
-//#define PROFILE
-
-
-#ifdef DEBUG
-#  define LOG_INT(...) qemu_log_mask(CPU_LOG_INT, ## __VA_ARGS__)
-#  define LOG_INT_STATE(env) log_cpu_state_mask(CPU_LOG_INT, (env), 0)
-#else
-#  define LOG_INT(...) do { } while (0)
-#  define LOG_INT_STATE(env) do { } while (0)
-#endif
-
-#include <unistd.h>
-#include <fcntl.h>
-#include "kqemu.h"
-
-#ifdef _WIN32
-#define KQEMU_DEVICE "\\\\.\\kqemu"
-#else
-#define KQEMU_DEVICE "/dev/kqemu"
-#endif
-
-static void qpi_init(void);
-
-#ifdef _WIN32
-#define KQEMU_INVALID_FD INVALID_HANDLE_VALUE
-HANDLE kqemu_fd = KQEMU_INVALID_FD;
-#define kqemu_closefd(x) CloseHandle(x)
-#else
-#define KQEMU_INVALID_FD -1
-int kqemu_fd = KQEMU_INVALID_FD;
-#define kqemu_closefd(x) close(x)
-#endif
-
-/* 0 = not allowed
-   1 = user kqemu
-   2 = kernel kqemu
-*/
-int kqemu_allowed = 0;
-uint64_t *pages_to_flush;
-unsigned int nb_pages_to_flush;
-uint64_t *ram_pages_to_update;
-unsigned int nb_ram_pages_to_update;
-uint64_t *modified_ram_pages;
-unsigned int nb_modified_ram_pages;
-uint8_t *modified_ram_pages_table;
-int qpi_io_memory;
-uint32_t kqemu_comm_base; /* physical address of the QPI communication page */
-ram_addr_t kqemu_phys_ram_size;
-uint8_t *kqemu_phys_ram_base;
-
-#define cpuid(index, eax, ebx, ecx, edx) \
-  asm volatile ("cpuid" \
-                : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) \
-                : "0" (index))
-
-#ifdef __x86_64__
-static int is_cpuid_supported(void)
-{
-    return 1;
-}
-#else
-static int is_cpuid_supported(void)
-{
-    int v0, v1;
-    asm volatile ("pushf\n"
-                  "popl %0\n"
-                  "movl %0, %1\n"
-                  "xorl $0x00200000, %0\n"
-                  "pushl %0\n"
-                  "popf\n"
-                  "pushf\n"
-                  "popl %0\n"
-                  : "=a" (v0), "=d" (v1)
-                  :
-                  : "cc");
-    return (v0 != v1);
-}
-#endif
-
-static void kqemu_update_cpuid(CPUState *env)
-{
-    int critical_features_mask, features, ext_features, ext_features_mask;
-    uint32_t eax, ebx, ecx, edx;
-
-    /* the following features are kept identical on the host and
-       target cpus because they are important for user code. Strictly
-       speaking, only SSE really matters because the OS must support
-       it if the user code uses it. */
-    critical_features_mask =
-        CPUID_CMOV | CPUID_CX8 |
-        CPUID_FXSR | CPUID_MMX | CPUID_SSE |
-        CPUID_SSE2 | CPUID_SEP;
-    ext_features_mask = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR;
-    if (!is_cpuid_supported()) {
-        features = 0;
-        ext_features = 0;
-    } else {
-        cpuid(1, eax, ebx, ecx, edx);
-        features = edx;
-        ext_features = ecx;
-    }
-#ifdef __x86_64__
-    /* NOTE: on x86_64 CPUs, SYSENTER is not supported in
-       compatibility mode, so in order to have the best performances
-       it is better not to use it */
-    features &= ~CPUID_SEP;
-#endif
-    env->cpuid_features = (env->cpuid_features & ~critical_features_mask) |
-        (features & critical_features_mask);
-    env->cpuid_ext_features = (env->cpuid_ext_features & ~ext_features_mask) |
-        (ext_features & ext_features_mask);
-    /* XXX: we could update more of the target CPUID state so that the
-       non accelerated code sees exactly the same CPU features as the
-       accelerated code */
-}
-
-int kqemu_init(CPUState *env)
-{
-    struct kqemu_init kinit;
-    int ret, version;
-#ifdef _WIN32
-    DWORD temp;
-#endif
-
-    if (!kqemu_allowed)
-        return -1;
-
-#ifdef _WIN32
-    kqemu_fd = CreateFile(KQEMU_DEVICE, GENERIC_WRITE | GENERIC_READ,
-                          FILE_SHARE_READ | FILE_SHARE_WRITE,
-                          NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
-                          NULL);
-    if (kqemu_fd == KQEMU_INVALID_FD) {
-        fprintf(stderr, "Could not open '%s' - QEMU acceleration layer not activated: %lu\n",
-                KQEMU_DEVICE, GetLastError());
-        return -1;
-    }
-#else
-    kqemu_fd = open(KQEMU_DEVICE, O_RDWR);
-    if (kqemu_fd == KQEMU_INVALID_FD) {
-        fprintf(stderr, "Could not open '%s' - QEMU acceleration layer not activated: %s\n",
-                KQEMU_DEVICE, strerror(errno));
-        return -1;
-    }
-#endif
-    version = 0;
-#ifdef _WIN32
-    DeviceIoControl(kqemu_fd, KQEMU_GET_VERSION, NULL, 0,
-                    &version, sizeof(version), &temp, NULL);
-#else
-    ioctl(kqemu_fd, KQEMU_GET_VERSION, &version);
-#endif
-    if (version != KQEMU_VERSION) {
-        fprintf(stderr, "Version mismatch between kqemu module and qemu (%08x %08x) - disabling kqemu use\n",
-                version, KQEMU_VERSION);
-        goto fail;
-    }
-
-    pages_to_flush = qemu_vmalloc(KQEMU_MAX_PAGES_TO_FLUSH *
-                                  sizeof(uint64_t));
-    if (!pages_to_flush)
-        goto fail;
-
-    ram_pages_to_update = qemu_vmalloc(KQEMU_MAX_RAM_PAGES_TO_UPDATE *
-                                       sizeof(uint64_t));
-    if (!ram_pages_to_update)
-        goto fail;
-
-    modified_ram_pages = qemu_vmalloc(KQEMU_MAX_MODIFIED_RAM_PAGES *
-                                      sizeof(uint64_t));
-    if (!modified_ram_pages)
-        goto fail;
-    modified_ram_pages_table =
-        qemu_mallocz(kqemu_phys_ram_size >> TARGET_PAGE_BITS);
-    if (!modified_ram_pages_table)
-        goto fail;
-
-    memset(&kinit, 0, sizeof(kinit)); /* set the paddings to zero */
-    kinit.ram_base = kqemu_phys_ram_base;
-    kinit.ram_size = kqemu_phys_ram_size;
-    kinit.ram_dirty = phys_ram_dirty;
-    kinit.pages_to_flush = pages_to_flush;
-    kinit.ram_pages_to_update = ram_pages_to_update;
-    kinit.modified_ram_pages = modified_ram_pages;
-#ifdef _WIN32
-    ret = DeviceIoControl(kqemu_fd, KQEMU_INIT, &kinit, sizeof(kinit),
-                          NULL, 0, &temp, NULL) == TRUE ? 0 : -1;
-#else
-    ret = ioctl(kqemu_fd, KQEMU_INIT, &kinit);
-#endif
-    if (ret < 0) {
-        fprintf(stderr, "Error %d while initializing QEMU acceleration layer - disabling it for now\n", ret);
-    fail:
-        kqemu_closefd(kqemu_fd);
-        kqemu_fd = KQEMU_INVALID_FD;
-        return -1;
-    }
-    kqemu_update_cpuid(env);
-    env->kqemu_enabled = kqemu_allowed;
-    nb_pages_to_flush = 0;
-    nb_ram_pages_to_update = 0;
-
-    qpi_init();
-    return 0;
-}
-
-void kqemu_flush_page(CPUState *env, target_ulong addr)
-{
-    LOG_INT("kqemu_flush_page: addr=" TARGET_FMT_lx "\n", addr);
-    if (nb_pages_to_flush >= KQEMU_MAX_PAGES_TO_FLUSH)
-        nb_pages_to_flush = KQEMU_FLUSH_ALL;
-    else
-        pages_to_flush[nb_pages_to_flush++] = addr;
-}
-
-void kqemu_flush(CPUState *env, int global)
-{
-    LOG_INT("kqemu_flush:\n");
-    nb_pages_to_flush = KQEMU_FLUSH_ALL;
-}
-
-void kqemu_set_notdirty(CPUState *env, ram_addr_t ram_addr)
-{
-    LOG_INT("kqemu_set_notdirty: addr=%08lx\n", 
-                (unsigned long)ram_addr);
-    /* we only track transitions to dirty state */
-    if (phys_ram_dirty[ram_addr >> TARGET_PAGE_BITS] != 0xff)
-        return;
-    if (nb_ram_pages_to_update >= KQEMU_MAX_RAM_PAGES_TO_UPDATE)
-        nb_ram_pages_to_update = KQEMU_RAM_PAGES_UPDATE_ALL;
-    else
-        ram_pages_to_update[nb_ram_pages_to_update++] = ram_addr;
-}
-
-static void kqemu_reset_modified_ram_pages(void)
-{
-    int i;
-    unsigned long page_index;
-
-    for(i = 0; i < nb_modified_ram_pages; i++) {
-        page_index = modified_ram_pages[i] >> TARGET_PAGE_BITS;
-        modified_ram_pages_table[page_index] = 0;
-    }
-    nb_modified_ram_pages = 0;
-}
-
-void kqemu_modify_page(CPUState *env, ram_addr_t ram_addr)
-{
-    unsigned long page_index;
-    int ret;
-#ifdef _WIN32
-    DWORD temp;
-#endif
-
-    page_index = ram_addr >> TARGET_PAGE_BITS;
-    if (!modified_ram_pages_table[page_index]) {
-#if 0
-        printf("%d: modify_page=%08lx\n", nb_modified_ram_pages, ram_addr);
-#endif
-        modified_ram_pages_table[page_index] = 1;
-        modified_ram_pages[nb_modified_ram_pages++] = ram_addr;
-        if (nb_modified_ram_pages >= KQEMU_MAX_MODIFIED_RAM_PAGES) {
-            /* flush */
-#ifdef _WIN32
-            ret = DeviceIoControl(kqemu_fd, KQEMU_MODIFY_RAM_PAGES,
-                                  &nb_modified_ram_pages,
-                                  sizeof(nb_modified_ram_pages),
-                                  NULL, 0, &temp, NULL);
-#else
-            ret = ioctl(kqemu_fd, KQEMU_MODIFY_RAM_PAGES,
-                        &nb_modified_ram_pages);
-#endif
-            kqemu_reset_modified_ram_pages();
-        }
-    }
-}
-
-void kqemu_set_phys_mem(uint64_t start_addr, ram_addr_t size, 
-                        ram_addr_t phys_offset)
-{
-    struct kqemu_phys_mem kphys_mem1, *kphys_mem = &kphys_mem1;
-    uint64_t end;
-    int ret, io_index;
-
-    end = (start_addr + size + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK;
-    start_addr &= TARGET_PAGE_MASK;
-    kphys_mem->phys_addr = start_addr;
-    kphys_mem->size = end - start_addr;
-    kphys_mem->ram_addr = phys_offset & TARGET_PAGE_MASK;
-    io_index = phys_offset & ~TARGET_PAGE_MASK;
-    switch(io_index) {
-    case IO_MEM_RAM:
-        kphys_mem->io_index = KQEMU_IO_MEM_RAM;
-        break;
-    case IO_MEM_ROM:
-        kphys_mem->io_index = KQEMU_IO_MEM_ROM;
-        break;
-    default:
-        if (qpi_io_memory == io_index) {
-            kphys_mem->io_index = KQEMU_IO_MEM_COMM;
-        } else {
-            kphys_mem->io_index = KQEMU_IO_MEM_UNASSIGNED;
-        }
-        break;
-    }
-#ifdef _WIN32
-    {
-        DWORD temp;
-        ret = DeviceIoControl(kqemu_fd, KQEMU_SET_PHYS_MEM, 
-                              kphys_mem, sizeof(*kphys_mem),
-                              NULL, 0, &temp, NULL) == TRUE ? 0 : -1;
-    }
-#else
-    ret = ioctl(kqemu_fd, KQEMU_SET_PHYS_MEM, kphys_mem);
-#endif
-    if (ret < 0) {
-        fprintf(stderr, "kqemu: KQEMU_SET_PHYS_PAGE error=%d: start_addr=0x%016" PRIx64 " size=0x%08lx phys_offset=0x%08lx\n",
-                ret, start_addr, 
-                (unsigned long)size, (unsigned long)phys_offset);
-    }
-}
-
-struct fpstate {
-    uint16_t fpuc;
-    uint16_t dummy1;
-    uint16_t fpus;
-    uint16_t dummy2;
-    uint16_t fptag;
-    uint16_t dummy3;
-
-    uint32_t fpip;
-    uint32_t fpcs;
-    uint32_t fpoo;
-    uint32_t fpos;
-    uint8_t fpregs1[8 * 10];
-};
-
-struct fpxstate {
-    uint16_t fpuc;
-    uint16_t fpus;
-    uint16_t fptag;
-    uint16_t fop;
-    uint32_t fpuip;
-    uint16_t cs_sel;
-    uint16_t dummy0;
-    uint32_t fpudp;
-    uint16_t ds_sel;
-    uint16_t dummy1;
-    uint32_t mxcsr;
-    uint32_t mxcsr_mask;
-    uint8_t fpregs1[8 * 16];
-    uint8_t xmm_regs[16 * 16];
-    uint8_t dummy2[96];
-};
-
-static struct fpxstate fpx1 __attribute__((aligned(16)));
-
-static void restore_native_fp_frstor(CPUState *env)
-{
-    int fptag, i, j;
-    struct fpstate fp1, *fp = &fp1;
-
-    fp->fpuc = env->fpuc;
-    fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
-    fptag = 0;
-    for (i=7; i>=0; i--) {
-	fptag <<= 2;
-	if (env->fptags[i]) {
-            fptag |= 3;
-        } else {
-            /* the FPU automatically computes it */
-        }
-    }
-    fp->fptag = fptag;
-    j = env->fpstt;
-    for(i = 0;i < 8; i++) {
-        memcpy(&fp->fpregs1[i * 10], &env->fpregs[j].d, 10);
-        j = (j + 1) & 7;
-    }
-    asm volatile ("frstor %0" : "=m" (*fp));
-}
-
-static void save_native_fp_fsave(CPUState *env)
-{
-    int fptag, i, j;
-    uint16_t fpuc;
-    struct fpstate fp1, *fp = &fp1;
-
-    asm volatile ("fsave %0" : : "m" (*fp));
-    env->fpuc = fp->fpuc;
-    env->fpstt = (fp->fpus >> 11) & 7;
-    env->fpus = fp->fpus & ~0x3800;
-    fptag = fp->fptag;
-    for(i = 0;i < 8; i++) {
-        env->fptags[i] = ((fptag & 3) == 3);
-        fptag >>= 2;
-    }
-    j = env->fpstt;
-    for(i = 0;i < 8; i++) {
-        memcpy(&env->fpregs[j].d, &fp->fpregs1[i * 10], 10);
-        j = (j + 1) & 7;
-    }
-    /* we must restore the default rounding state */
-    fpuc = 0x037f | (env->fpuc & (3 << 10));
-    asm volatile("fldcw %0" : : "m" (fpuc));
-}
-
-static void restore_native_fp_fxrstor(CPUState *env)
-{
-    struct fpxstate *fp = &fpx1;
-    int i, j, fptag;
-
-    fp->fpuc = env->fpuc;
-    fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
-    fptag = 0;
-    for(i = 0; i < 8; i++)
-        fptag |= (env->fptags[i] << i);
-    fp->fptag = fptag ^ 0xff;
-
-    j = env->fpstt;
-    for(i = 0;i < 8; i++) {
-        memcpy(&fp->fpregs1[i * 16], &env->fpregs[j].d, 10);
-        j = (j + 1) & 7;
-    }
-    if (env->cpuid_features & CPUID_SSE) {
-        fp->mxcsr = env->mxcsr;
-        /* XXX: check if DAZ is not available */
-        fp->mxcsr_mask = 0xffff;
-        memcpy(fp->xmm_regs, env->xmm_regs, CPU_NB_REGS * 16);
-    }
-    asm volatile ("fxrstor %0" : "=m" (*fp));
-}
-
-static void save_native_fp_fxsave(CPUState *env)
-{
-    struct fpxstate *fp = &fpx1;
-    int fptag, i, j;
-    uint16_t fpuc;
-
-    asm volatile ("fxsave %0" : : "m" (*fp));
-    env->fpuc = fp->fpuc;
-    env->fpstt = (fp->fpus >> 11) & 7;
-    env->fpus = fp->fpus & ~0x3800;
-    fptag = fp->fptag ^ 0xff;
-    for(i = 0;i < 8; i++) {
-        env->fptags[i] = (fptag >> i) & 1;
-    }
-    j = env->fpstt;
-    for(i = 0;i < 8; i++) {
-        memcpy(&env->fpregs[j].d, &fp->fpregs1[i * 16], 10);
-        j = (j + 1) & 7;
-    }
-    if (env->cpuid_features & CPUID_SSE) {
-        env->mxcsr = fp->mxcsr;
-        memcpy(env->xmm_regs, fp->xmm_regs, CPU_NB_REGS * 16);
-    }
-
-    /* we must restore the default rounding state */
-    asm volatile ("fninit");
-    fpuc = 0x037f | (env->fpuc & (3 << 10));
-    asm volatile("fldcw %0" : : "m" (fpuc));
-}
-
-static int do_syscall(CPUState *env,
-                      struct kqemu_cpu_state *kenv)
-{
-    int selector;
-
-    selector = (env->star >> 32) & 0xffff;
-#ifdef TARGET_X86_64
-    if (env->hflags & HF_LMA_MASK) {
-        int code64;
-
-        env->regs[R_ECX] = kenv->next_eip;
-        env->regs[11] = env->eflags;
-
-        code64 = env->hflags & HF_CS64_MASK;
-
-        cpu_x86_set_cpl(env, 0);
-        cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
-                               0, 0xffffffff,
-                               DESC_G_MASK | DESC_P_MASK |
-                               DESC_S_MASK |
-                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | DESC_L_MASK);
-        cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
-                               0, 0xffffffff,
-                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
-                               DESC_S_MASK |
-                               DESC_W_MASK | DESC_A_MASK);
-        env->eflags &= ~env->fmask;
-        if (code64)
-            env->eip = env->lstar;
-        else
-            env->eip = env->cstar;
-    } else
-#endif
-    {
-        env->regs[R_ECX] = (uint32_t)kenv->next_eip;
-
-        cpu_x86_set_cpl(env, 0);
-        cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
-                           0, 0xffffffff,
-                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
-                               DESC_S_MASK |
-                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
-        cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
-                               0, 0xffffffff,
-                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
-                               DESC_S_MASK |
-                               DESC_W_MASK | DESC_A_MASK);
-        env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
-        env->eip = (uint32_t)env->star;
-    }
-    return 2;
-}
-
-#ifdef CONFIG_PROFILER
-
-#define PC_REC_SIZE 1
-#define PC_REC_HASH_BITS 16
-#define PC_REC_HASH_SIZE (1 << PC_REC_HASH_BITS)
-
-typedef struct PCRecord {
-    unsigned long pc;
-    int64_t count;
-    struct PCRecord *next;
-} PCRecord;
-
-static PCRecord *pc_rec_hash[PC_REC_HASH_SIZE];
-static int nb_pc_records;
-
-static void kqemu_record_pc(unsigned long pc)
-{
-    unsigned long h;
-    PCRecord **pr, *r;
-
-    h = pc / PC_REC_SIZE;
-    h = h ^ (h >> PC_REC_HASH_BITS);
-    h &= (PC_REC_HASH_SIZE - 1);
-    pr = &pc_rec_hash[h];
-    for(;;) {
-        r = *pr;
-        if (r == NULL)
-            break;
-        if (r->pc == pc) {
-            r->count++;
-            return;
-        }
-        pr = &r->next;
-    }
-    r = malloc(sizeof(PCRecord));
-    r->count = 1;
-    r->pc = pc;
-    r->next = NULL;
-    *pr = r;
-    nb_pc_records++;
-}
-
-static int pc_rec_cmp(const void *p1, const void *p2)
-{
-    PCRecord *r1 = *(PCRecord **)p1;
-    PCRecord *r2 = *(PCRecord **)p2;
-    if (r1->count < r2->count)
-        return 1;
-    else if (r1->count == r2->count)
-        return 0;
-    else
-        return -1;
-}
-
-static void kqemu_record_flush(void)
-{
-    PCRecord *r, *r_next;
-    int h;
-
-    for(h = 0; h < PC_REC_HASH_SIZE; h++) {
-        for(r = pc_rec_hash[h]; r != NULL; r = r_next) {
-            r_next = r->next;
-            free(r);
-        }
-        pc_rec_hash[h] = NULL;
-    }
-    nb_pc_records = 0;
-}
-
-void kqemu_record_dump(void)
-{
-    PCRecord **pr, *r;
-    int i, h;
-    FILE *f;
-    int64_t total, sum;
-
-    pr = malloc(sizeof(PCRecord *) * nb_pc_records);
-    i = 0;
-    total = 0;
-    for(h = 0; h < PC_REC_HASH_SIZE; h++) {
-        for(r = pc_rec_hash[h]; r != NULL; r = r->next) {
-            pr[i++] = r;
-            total += r->count;
-        }
-    }
-    qsort(pr, nb_pc_records, sizeof(PCRecord *), pc_rec_cmp);
-
-    f = fopen("/tmp/kqemu.stats", "w");
-    if (!f) {
-        perror("/tmp/kqemu.stats");
-        exit(1);
-    }
-    fprintf(f, "total: %" PRId64 "\n", total);
-    sum = 0;
-    for(i = 0; i < nb_pc_records; i++) {
-        r = pr[i];
-        sum += r->count;
-        fprintf(f, "%08lx: %" PRId64 " %0.2f%% %0.2f%%\n",
-                r->pc,
-                r->count,
-                (double)r->count / (double)total * 100.0,
-                (double)sum / (double)total * 100.0);
-    }
-    fclose(f);
-    free(pr);
-
-    kqemu_record_flush();
-}
-#endif
-
-static inline void kqemu_load_seg(struct kqemu_segment_cache *ksc,
-                                  const SegmentCache *sc)
-{
-    ksc->selector = sc->selector;
-    ksc->flags = sc->flags;
-    ksc->limit = sc->limit;
-    ksc->base = sc->base;
-}
-
-static inline void kqemu_save_seg(SegmentCache *sc,
-                                  const struct kqemu_segment_cache *ksc)
-{
-    sc->selector = ksc->selector;
-    sc->flags = ksc->flags;
-    sc->limit = ksc->limit;
-    sc->base = ksc->base;
-}
-
-int kqemu_cpu_exec(CPUState *env)
-{
-    struct kqemu_cpu_state kcpu_state, *kenv = &kcpu_state;
-    int ret, cpl, i;
-#ifdef CONFIG_PROFILER
-    int64_t ti;
-#endif
-#ifdef _WIN32
-    DWORD temp;
-#endif
-
-#ifdef CONFIG_PROFILER
-    ti = profile_getclock();
-#endif
-    LOG_INT("kqemu: cpu_exec: enter\n");
-    LOG_INT_STATE(env);
-    for(i = 0; i < CPU_NB_REGS; i++)
-        kenv->regs[i] = env->regs[i];
-    kenv->eip = env->eip;
-    kenv->eflags = env->eflags;
-    for(i = 0; i < 6; i++)
-        kqemu_load_seg(&kenv->segs[i], &env->segs[i]);
-    kqemu_load_seg(&kenv->ldt, &env->ldt);
-    kqemu_load_seg(&kenv->tr, &env->tr);
-    kqemu_load_seg(&kenv->gdt, &env->gdt);
-    kqemu_load_seg(&kenv->idt, &env->idt);
-    kenv->cr0 = env->cr[0];
-    kenv->cr2 = env->cr[2];
-    kenv->cr3 = env->cr[3];
-    kenv->cr4 = env->cr[4];
-    kenv->a20_mask = env->a20_mask;
-    kenv->efer = env->efer;
-    kenv->tsc_offset = 0;
-    kenv->star = env->star;
-    kenv->sysenter_cs = env->sysenter_cs;
-    kenv->sysenter_esp = env->sysenter_esp;
-    kenv->sysenter_eip = env->sysenter_eip;
-#ifdef TARGET_X86_64
-    kenv->lstar = env->lstar;
-    kenv->cstar = env->cstar;
-    kenv->fmask = env->fmask;
-    kenv->kernelgsbase = env->kernelgsbase;
-#endif
-    if (env->dr[7] & 0xff) {
-        kenv->dr7 = env->dr[7];
-        kenv->dr0 = env->dr[0];
-        kenv->dr1 = env->dr[1];
-        kenv->dr2 = env->dr[2];
-        kenv->dr3 = env->dr[3];
-    } else {
-        kenv->dr7 = 0;
-    }
-    kenv->dr6 = env->dr[6];
-    cpl = (env->hflags & HF_CPL_MASK);
-    kenv->cpl = cpl;
-    kenv->nb_pages_to_flush = nb_pages_to_flush;
-    kenv->user_only = (env->kqemu_enabled == 1);
-    kenv->nb_ram_pages_to_update = nb_ram_pages_to_update;
-    nb_ram_pages_to_update = 0;
-    kenv->nb_modified_ram_pages = nb_modified_ram_pages;
-
-    kqemu_reset_modified_ram_pages();
-
-    if (env->cpuid_features & CPUID_FXSR)
-        restore_native_fp_fxrstor(env);
-    else
-        restore_native_fp_frstor(env);
-
-#ifdef _WIN32
-    if (DeviceIoControl(kqemu_fd, KQEMU_EXEC,
-                        kenv, sizeof(struct kqemu_cpu_state),
-                        kenv, sizeof(struct kqemu_cpu_state),
-                        &temp, NULL)) {
-        ret = kenv->retval;
-    } else {
-        ret = -1;
-    }
-#else
-    ioctl(kqemu_fd, KQEMU_EXEC, kenv);
-    ret = kenv->retval;
-#endif
-    if (env->cpuid_features & CPUID_FXSR)
-        save_native_fp_fxsave(env);
-    else
-        save_native_fp_fsave(env);
-
-    for(i = 0; i < CPU_NB_REGS; i++)
-        env->regs[i] = kenv->regs[i];
-    env->eip = kenv->eip;
-    env->eflags = kenv->eflags;
-    for(i = 0; i < 6; i++)
-        kqemu_save_seg(&env->segs[i], &kenv->segs[i]);
-    cpu_x86_set_cpl(env, kenv->cpl);
-    kqemu_save_seg(&env->ldt, &kenv->ldt);
-    env->cr[0] = kenv->cr0;
-    env->cr[4] = kenv->cr4;
-    env->cr[3] = kenv->cr3;
-    env->cr[2] = kenv->cr2;
-    env->dr[6] = kenv->dr6;
-#ifdef TARGET_X86_64
-    env->kernelgsbase = kenv->kernelgsbase;
-#endif
-
-    /* flush pages as indicated by kqemu */
-    if (kenv->nb_pages_to_flush >= KQEMU_FLUSH_ALL) {
-        tlb_flush(env, 1);
-    } else {
-        for(i = 0; i < kenv->nb_pages_to_flush; i++) {
-            tlb_flush_page(env, pages_to_flush[i]);
-        }
-    }
-    nb_pages_to_flush = 0;
-
-#ifdef CONFIG_PROFILER
-    kqemu_time += profile_getclock() - ti;
-    kqemu_exec_count++;
-#endif
-
-    if (kenv->nb_ram_pages_to_update > 0) {
-        cpu_tlb_update_dirty(env);
-    }
-
-    if (kenv->nb_modified_ram_pages > 0) {
-        for(i = 0; i < kenv->nb_modified_ram_pages; i++) {
-            unsigned long addr;
-            addr = modified_ram_pages[i];
-            tb_invalidate_phys_page_range(addr, addr + TARGET_PAGE_SIZE, 0);
-        }
-    }
-
-    /* restore the hidden flags */
-    {
-        unsigned int new_hflags;
-#ifdef TARGET_X86_64
-        if ((env->hflags & HF_LMA_MASK) &&
-            (env->segs[R_CS].flags & DESC_L_MASK)) {
-            /* long mode */
-            new_hflags = HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
-        } else
-#endif
-        {
-            /* legacy / compatibility case */
-            new_hflags = (env->segs[R_CS].flags & DESC_B_MASK)
-                >> (DESC_B_SHIFT - HF_CS32_SHIFT);
-            new_hflags |= (env->segs[R_SS].flags & DESC_B_MASK)
-                >> (DESC_B_SHIFT - HF_SS32_SHIFT);
-            if (!(env->cr[0] & CR0_PE_MASK) ||
-                   (env->eflags & VM_MASK) ||
-                   !(env->hflags & HF_CS32_MASK)) {
-                /* XXX: try to avoid this test. The problem comes from the
-                   fact that is real mode or vm86 mode we only modify the
-                   'base' and 'selector' fields of the segment cache to go
-                   faster. A solution may be to force addseg to one in
-                   translate-i386.c. */
-                new_hflags |= HF_ADDSEG_MASK;
-            } else {
-                new_hflags |= ((env->segs[R_DS].base |
-                                env->segs[R_ES].base |
-                                env->segs[R_SS].base) != 0) <<
-                    HF_ADDSEG_SHIFT;
-            }
-        }
-        env->hflags = (env->hflags &
-           ~(HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)) |
-            new_hflags;
-    }
-    /* update FPU flags */
-    env->hflags = (env->hflags & ~(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)) |
-        ((env->cr[0] << (HF_MP_SHIFT - 1)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK));
-    if (env->cr[4] & CR4_OSFXSR_MASK)
-        env->hflags |= HF_OSFXSR_MASK;
-    else
-        env->hflags &= ~HF_OSFXSR_MASK;
-
-    LOG_INT("kqemu: kqemu_cpu_exec: ret=0x%x\n", ret);
-    if (ret == KQEMU_RET_SYSCALL) {
-        /* syscall instruction */
-        return do_syscall(env, kenv);
-    } else
-    if ((ret & 0xff00) == KQEMU_RET_INT) {
-        env->exception_index = ret & 0xff;
-        env->error_code = 0;
-        env->exception_is_int = 1;
-        env->exception_next_eip = kenv->next_eip;
-#ifdef CONFIG_PROFILER
-        kqemu_ret_int_count++;
-#endif
-        LOG_INT("kqemu: interrupt v=%02x:\n", env->exception_index);
-        LOG_INT_STATE(env);
-        return 1;
-    } else if ((ret & 0xff00) == KQEMU_RET_EXCEPTION) {
-        env->exception_index = ret & 0xff;
-        env->error_code = kenv->error_code;
-        env->exception_is_int = 0;
-        env->exception_next_eip = 0;
-#ifdef CONFIG_PROFILER
-        kqemu_ret_excp_count++;
-#endif
-        LOG_INT("kqemu: exception v=%02x e=%04x:\n",
-                    env->exception_index, env->error_code);
-        LOG_INT_STATE(env);
-        return 1;
-    } else if (ret == KQEMU_RET_INTR) {
-#ifdef CONFIG_PROFILER
-        kqemu_ret_intr_count++;
-#endif
-        LOG_INT_STATE(env);
-        return 0;
-    } else if (ret == KQEMU_RET_SOFTMMU) {
-#ifdef CONFIG_PROFILER
-        {
-            unsigned long pc = env->eip + env->segs[R_CS].base;
-            kqemu_record_pc(pc);
-        }
-#endif
-        LOG_INT_STATE(env);
-        return 2;
-    } else {
-        cpu_dump_state(env, stderr, fprintf, 0);
-        fprintf(stderr, "Unsupported return value: 0x%x\n", ret);
-        exit(1);
-    }
-    return 0;
-}
-
-void kqemu_cpu_interrupt(CPUState *env)
-{
-#if defined(_WIN32)
-    /* cancelling the I/O request causes KQEMU to finish executing the
-       current block and successfully returning. */
-    CancelIo(kqemu_fd);
-#endif
-}
-
-/* 
-   QEMU paravirtualization interface. The current interface only
-   allows to modify the IF and IOPL flags when running in
-   kqemu.
-
-   At this point it is not very satisfactory. I leave it for reference
-   as it adds little complexity.
-*/
-
-#define QPI_COMM_PAGE_PHYS_ADDR 0xff000000
-
-static uint32_t qpi_mem_readb(void *opaque, target_phys_addr_t addr)
-{
-    return 0;
-}
-
-static uint32_t qpi_mem_readw(void *opaque, target_phys_addr_t addr)
-{
-    return 0;
-}
-
-static void qpi_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-}
-
-static void qpi_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-}
-
-static uint32_t qpi_mem_readl(void *opaque, target_phys_addr_t addr)
-{
-    CPUState *env;
-
-    env = cpu_single_env;
-    if (!env)
-        return 0;
-    return env->eflags & (IF_MASK | IOPL_MASK);
-}
-
-/* Note: after writing to this address, the guest code must make sure
-   it is exiting the current TB. pushf/popf can be used for that
-   purpose. */
-static void qpi_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    CPUState *env;
-
-    env = cpu_single_env;
-    if (!env)
-        return;
-    env->eflags = (env->eflags & ~(IF_MASK | IOPL_MASK)) | 
-        (val & (IF_MASK | IOPL_MASK));
-}
-
-static CPUReadMemoryFunc *qpi_mem_read[3] = {
-    qpi_mem_readb,
-    qpi_mem_readw,
-    qpi_mem_readl,
-};
-
-static CPUWriteMemoryFunc *qpi_mem_write[3] = {
-    qpi_mem_writeb,
-    qpi_mem_writew,
-    qpi_mem_writel,
-};
-
-static void qpi_init(void)
-{
-    kqemu_comm_base = 0xff000000 | 1;
-    qpi_io_memory = cpu_register_io_memory(
-                                           qpi_mem_read, 
-                                           qpi_mem_write, NULL);
-    cpu_register_physical_memory(kqemu_comm_base & ~0xfff, 
-                                 0x1000, qpi_io_memory);
-}
-#endif