hw/i386/xen/: move xen-mapcache.c to hw/xen/

xen-mapcache.c contains common functions which can be used for enabling Xen on
aarch64 with IOREQ handling. Moving it out from hw/i386/xen to hw/xen to make it
accessible for both aarch64 and x86.

Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Reviewed-by: Paul Durrant <paul@xen.org>

3 files changed, 0 insertions, 605 deletions

diff --git a/hw/i386/xen/meson.build b/hw/i386/xen/meson.build
index 2e64a34e16..3dc4c4f106 100644
--- a/hw/i386/xen/meson.build
+++ b/hw/i386/xen/meson.build
@@ -1,6 +1,5 @@
 i386_ss.add(when: 'CONFIG_XEN', if_true: files(
   'xen-hvm.c',
-  'xen-mapcache.c',
   'xen_apic.c',
   'xen_pvdevice.c',
 ))
diff --git a/hw/i386/xen/trace-events b/hw/i386/xen/trace-events
index 5d6be61090..a0c89d91c4 100644
--- a/hw/i386/xen/trace-events
+++ b/hw/i386/xen/trace-events
@@ -21,8 +21,3 @@ xen_map_resource_ioreq(uint32_t id, void *addr) "id: %u addr: %p"
 cpu_ioreq_config_read(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
 cpu_ioreq_config_write(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
 
-# xen-mapcache.c
-xen_map_cache(uint64_t phys_addr) "want 0x%"PRIx64
-xen_remap_bucket(uint64_t index) "index 0x%"PRIx64
-xen_map_cache_return(void* ptr) "%p"
-
diff --git a/hw/i386/xen/xen-mapcache.c b/hw/i386/xen/xen-mapcache.c
deleted file mode 100644
index f7d974677d..0000000000
--- a/hw/i386/xen/xen-mapcache.c
+++ /dev/null
@@ -1,599 +0,0 @@
-/*
- * Copyright (C) 2011       Citrix Ltd.
- *
- * This work is licensed under the terms of the GNU GPL, version 2.  See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "qemu/units.h"
-#include "qemu/error-report.h"
-
-#include <sys/resource.h>
-
-#include "hw/xen/xen_native.h"
-#include "qemu/bitmap.h"
-
-#include "sysemu/runstate.h"
-#include "sysemu/xen-mapcache.h"
-#include "trace.h"
-
-
-//#define MAPCACHE_DEBUG
-
-#ifdef MAPCACHE_DEBUG
-#  define DPRINTF(fmt, ...) do { \
-    fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
-} while (0)
-#else
-#  define DPRINTF(fmt, ...) do { } while (0)
-#endif
-
-#if HOST_LONG_BITS == 32
-#  define MCACHE_BUCKET_SHIFT 16
-#  define MCACHE_MAX_SIZE     (1UL<<31) /* 2GB Cap */
-#else
-#  define MCACHE_BUCKET_SHIFT 20
-#  define MCACHE_MAX_SIZE     (1UL<<35) /* 32GB Cap */
-#endif
-#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
-
-/* This is the size of the virtual address space reserve to QEMU that will not
- * be use by MapCache.
- * From empirical tests I observed that qemu use 75MB more than the
- * max_mcache_size.
- */
-#define NON_MCACHE_MEMORY_SIZE (80 * MiB)
-
-typedef struct MapCacheEntry {
-    hwaddr paddr_index;
-    uint8_t *vaddr_base;
-    unsigned long *valid_mapping;
-    uint32_t lock;
-#define XEN_MAPCACHE_ENTRY_DUMMY (1 << 0)
-    uint8_t flags;
-    hwaddr size;
-    struct MapCacheEntry *next;
-} MapCacheEntry;
-
-typedef struct MapCacheRev {
-    uint8_t *vaddr_req;
-    hwaddr paddr_index;
-    hwaddr size;
-    QTAILQ_ENTRY(MapCacheRev) next;
-    bool dma;
-} MapCacheRev;
-
-typedef struct MapCache {
-    MapCacheEntry *entry;
-    unsigned long nr_buckets;
-    QTAILQ_HEAD(, MapCacheRev) locked_entries;
-
-    /* For most cases (>99.9%), the page address is the same. */
-    MapCacheEntry *last_entry;
-    unsigned long max_mcache_size;
-    unsigned int mcache_bucket_shift;
-
-    phys_offset_to_gaddr_t phys_offset_to_gaddr;
-    QemuMutex lock;
-    void *opaque;
-} MapCache;
-
-static MapCache *mapcache;
-
-static inline void mapcache_lock(void)
-{
-    qemu_mutex_lock(&mapcache->lock);
-}
-
-static inline void mapcache_unlock(void)
-{
-    qemu_mutex_unlock(&mapcache->lock);
-}
-
-static inline int test_bits(int nr, int size, const unsigned long *addr)
-{
-    unsigned long res = find_next_zero_bit(addr, size + nr, nr);
-    if (res >= nr + size)
-        return 1;
-    else
-        return 0;
-}
-
-void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
-{
-    unsigned long size;
-    struct rlimit rlimit_as;
-
-    mapcache = g_new0(MapCache, 1);
-
-    mapcache->phys_offset_to_gaddr = f;
-    mapcache->opaque = opaque;
-    qemu_mutex_init(&mapcache->lock);
-
-    QTAILQ_INIT(&mapcache->locked_entries);
-
-    if (geteuid() == 0) {
-        rlimit_as.rlim_cur = RLIM_INFINITY;
-        rlimit_as.rlim_max = RLIM_INFINITY;
-        mapcache->max_mcache_size = MCACHE_MAX_SIZE;
-    } else {
-        getrlimit(RLIMIT_AS, &rlimit_as);
-        rlimit_as.rlim_cur = rlimit_as.rlim_max;
-
-        if (rlimit_as.rlim_max != RLIM_INFINITY) {
-            warn_report("QEMU's maximum size of virtual"
-                        " memory is not infinity");
-        }
-        if (rlimit_as.rlim_max < MCACHE_MAX_SIZE + NON_MCACHE_MEMORY_SIZE) {
-            mapcache->max_mcache_size = rlimit_as.rlim_max -
-                NON_MCACHE_MEMORY_SIZE;
-        } else {
-            mapcache->max_mcache_size = MCACHE_MAX_SIZE;
-        }
-    }
-
-    setrlimit(RLIMIT_AS, &rlimit_as);
-
-    mapcache->nr_buckets =
-        (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
-          (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
-         (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
-
-    size = mapcache->nr_buckets * sizeof (MapCacheEntry);
-    size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
-    DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
-            mapcache->nr_buckets, size);
-    mapcache->entry = g_malloc0(size);
-}
-
-static void xen_remap_bucket(MapCacheEntry *entry,
-                             void *vaddr,
-                             hwaddr size,
-                             hwaddr address_index,
-                             bool dummy)
-{
-    uint8_t *vaddr_base;
-    xen_pfn_t *pfns;
-    int *err;
-    unsigned int i;
-    hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
-
-    trace_xen_remap_bucket(address_index);
-
-    pfns = g_new0(xen_pfn_t, nb_pfn);
-    err = g_new0(int, nb_pfn);
-
-    if (entry->vaddr_base != NULL) {
-        if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
-            ram_block_notify_remove(entry->vaddr_base, entry->size,
-                                    entry->size);
-        }
-
-        /*
-         * If an entry is being replaced by another mapping and we're using
-         * MAP_FIXED flag for it - there is possibility of a race for vaddr
-         * address with another thread doing an mmap call itself
-         * (see man 2 mmap). To avoid that we skip explicit unmapping here
-         * and allow the kernel to destroy the previous mappings by replacing
-         * them in mmap call later.
-         *
-         * Non-identical replacements are not allowed therefore.
-         */
-        assert(!vaddr || (entry->vaddr_base == vaddr && entry->size == size));
-
-        if (!vaddr && munmap(entry->vaddr_base, entry->size) != 0) {
-            perror("unmap fails");
-            exit(-1);
-        }
-    }
-    g_free(entry->valid_mapping);
-    entry->valid_mapping = NULL;
-
-    for (i = 0; i < nb_pfn; i++) {
-        pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
-    }
-
-    /*
-     * If the caller has requested the mapping at a specific address use
-     * MAP_FIXED to make sure it's honored.
-     */
-    if (!dummy) {
-        vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
-                                           PROT_READ | PROT_WRITE,
-                                           vaddr ? MAP_FIXED : 0,
-                                           nb_pfn, pfns, err);
-        if (vaddr_base == NULL) {
-            perror("xenforeignmemory_map2");
-            exit(-1);
-        }
-    } else {
-        /*
-         * We create dummy mappings where we are unable to create a foreign
-         * mapping immediately due to certain circumstances (i.e. on resume now)
-         */
-        vaddr_base = mmap(vaddr, size, PROT_READ | PROT_WRITE,
-                          MAP_ANON | MAP_SHARED | (vaddr ? MAP_FIXED : 0),
-                          -1, 0);
-        if (vaddr_base == MAP_FAILED) {
-            perror("mmap");
-            exit(-1);
-        }
-    }
-
-    if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
-        ram_block_notify_add(vaddr_base, size, size);
-    }
-
-    entry->vaddr_base = vaddr_base;
-    entry->paddr_index = address_index;
-    entry->size = size;
-    entry->valid_mapping = g_new0(unsigned long,
-                                  BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
-
-    if (dummy) {
-        entry->flags |= XEN_MAPCACHE_ENTRY_DUMMY;
-    } else {
-        entry->flags &= ~(XEN_MAPCACHE_ENTRY_DUMMY);
-    }
-
-    bitmap_zero(entry->valid_mapping, nb_pfn);
-    for (i = 0; i < nb_pfn; i++) {
-        if (!err[i]) {
-            bitmap_set(entry->valid_mapping, i, 1);
-        }
-    }
-
-    g_free(pfns);
-    g_free(err);
-}
-
-static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
-                                       uint8_t lock, bool dma)
-{
-    MapCacheEntry *entry, *pentry = NULL,
-                  *free_entry = NULL, *free_pentry = NULL;
-    hwaddr address_index;
-    hwaddr address_offset;
-    hwaddr cache_size = size;
-    hwaddr test_bit_size;
-    bool translated G_GNUC_UNUSED = false;
-    bool dummy = false;
-
-tryagain:
-    address_index  = phys_addr >> MCACHE_BUCKET_SHIFT;
-    address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
-
-    trace_xen_map_cache(phys_addr);
-
-    /* test_bit_size is always a multiple of XC_PAGE_SIZE */
-    if (size) {
-        test_bit_size = size + (phys_addr & (XC_PAGE_SIZE - 1));
-
-        if (test_bit_size % XC_PAGE_SIZE) {
-            test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
-        }
-    } else {
-        test_bit_size = XC_PAGE_SIZE;
-    }
-
-    if (mapcache->last_entry != NULL &&
-        mapcache->last_entry->paddr_index == address_index &&
-        !lock && !size &&
-        test_bits(address_offset >> XC_PAGE_SHIFT,
-                  test_bit_size >> XC_PAGE_SHIFT,
-                  mapcache->last_entry->valid_mapping)) {
-        trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
-        return mapcache->last_entry->vaddr_base + address_offset;
-    }
-
-    /* size is always a multiple of MCACHE_BUCKET_SIZE */
-    if (size) {
-        cache_size = size + address_offset;
-        if (cache_size % MCACHE_BUCKET_SIZE) {
-            cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
-        }
-    } else {
-        cache_size = MCACHE_BUCKET_SIZE;
-    }
-
-    entry = &mapcache->entry[address_index % mapcache->nr_buckets];
-
-    while (entry && (lock || entry->lock) && entry->vaddr_base &&
-            (entry->paddr_index != address_index || entry->size != cache_size ||
-             !test_bits(address_offset >> XC_PAGE_SHIFT,
-                 test_bit_size >> XC_PAGE_SHIFT,
-                 entry->valid_mapping))) {
-        if (!free_entry && !entry->lock) {
-            free_entry = entry;
-            free_pentry = pentry;
-        }
-        pentry = entry;
-        entry = entry->next;
-    }
-    if (!entry && free_entry) {
-        entry = free_entry;
-        pentry = free_pentry;
-    }
-    if (!entry) {
-        entry = g_new0(MapCacheEntry, 1);
-        pentry->next = entry;
-        xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
-    } else if (!entry->lock) {
-        if (!entry->vaddr_base || entry->paddr_index != address_index ||
-                entry->size != cache_size ||
-                !test_bits(address_offset >> XC_PAGE_SHIFT,
-                    test_bit_size >> XC_PAGE_SHIFT,
-                    entry->valid_mapping)) {
-            xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
-        }
-    }
-
-    if(!test_bits(address_offset >> XC_PAGE_SHIFT,
-                test_bit_size >> XC_PAGE_SHIFT,
-                entry->valid_mapping)) {
-        mapcache->last_entry = NULL;
-#ifdef XEN_COMPAT_PHYSMAP
-        if (!translated && mapcache->phys_offset_to_gaddr) {
-            phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size);
-            translated = true;
-            goto tryagain;
-        }
-#endif
-        if (!dummy && runstate_check(RUN_STATE_INMIGRATE)) {
-            dummy = true;
-            goto tryagain;
-        }
-        trace_xen_map_cache_return(NULL);
-        return NULL;
-    }
-
-    mapcache->last_entry = entry;
-    if (lock) {
-        MapCacheRev *reventry = g_new0(MapCacheRev, 1);
-        entry->lock++;
-        if (entry->lock == 0) {
-            fprintf(stderr,
-                    "mapcache entry lock overflow: "HWADDR_FMT_plx" -> %p\n",
-                    entry->paddr_index, entry->vaddr_base);
-            abort();
-        }
-        reventry->dma = dma;
-        reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
-        reventry->paddr_index = mapcache->last_entry->paddr_index;
-        reventry->size = entry->size;
-        QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
-    }
-
-    trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
-    return mapcache->last_entry->vaddr_base + address_offset;
-}
-
-uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
-                       uint8_t lock, bool dma)
-{
-    uint8_t *p;
-
-    mapcache_lock();
-    p = xen_map_cache_unlocked(phys_addr, size, lock, dma);
-    mapcache_unlock();
-    return p;
-}
-
-ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
-{
-    MapCacheEntry *entry = NULL;
-    MapCacheRev *reventry;
-    hwaddr paddr_index;
-    hwaddr size;
-    ram_addr_t raddr;
-    int found = 0;
-
-    mapcache_lock();
-    QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-        if (reventry->vaddr_req == ptr) {
-            paddr_index = reventry->paddr_index;
-            size = reventry->size;
-            found = 1;
-            break;
-        }
-    }
-    if (!found) {
-        fprintf(stderr, "%s, could not find %p\n", __func__, ptr);
-        QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-            DPRINTF("   "HWADDR_FMT_plx" -> %p is present\n", reventry->paddr_index,
-                    reventry->vaddr_req);
-        }
-        abort();
-        return 0;
-    }
-
-    entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
-    while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
-        entry = entry->next;
-    }
-    if (!entry) {
-        DPRINTF("Trying to find address %p that is not in the mapcache!\n", ptr);
-        raddr = 0;
-    } else {
-        raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
-             ((unsigned long) ptr - (unsigned long) entry->vaddr_base);
-    }
-    mapcache_unlock();
-    return raddr;
-}
-
-static void xen_invalidate_map_cache_entry_unlocked(uint8_t *buffer)
-{
-    MapCacheEntry *entry = NULL, *pentry = NULL;
-    MapCacheRev *reventry;
-    hwaddr paddr_index;
-    hwaddr size;
-    int found = 0;
-
-    QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-        if (reventry->vaddr_req == buffer) {
-            paddr_index = reventry->paddr_index;
-            size = reventry->size;
-            found = 1;
-            break;
-        }
-    }
-    if (!found) {
-        DPRINTF("%s, could not find %p\n", __func__, buffer);
-        QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-            DPRINTF("   "HWADDR_FMT_plx" -> %p is present\n", reventry->paddr_index, reventry->vaddr_req);
-        }
-        return;
-    }
-    QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
-    g_free(reventry);
-
-    if (mapcache->last_entry != NULL &&
-        mapcache->last_entry->paddr_index == paddr_index) {
-        mapcache->last_entry = NULL;
-    }
-
-    entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
-    while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
-        pentry = entry;
-        entry = entry->next;
-    }
-    if (!entry) {
-        DPRINTF("Trying to unmap address %p that is not in the mapcache!\n", buffer);
-        return;
-    }
-    entry->lock--;
-    if (entry->lock > 0 || pentry == NULL) {
-        return;
-    }
-
-    pentry->next = entry->next;
-    ram_block_notify_remove(entry->vaddr_base, entry->size, entry->size);
-    if (munmap(entry->vaddr_base, entry->size) != 0) {
-        perror("unmap fails");
-        exit(-1);
-    }
-    g_free(entry->valid_mapping);
-    g_free(entry);
-}
-
-void xen_invalidate_map_cache_entry(uint8_t *buffer)
-{
-    mapcache_lock();
-    xen_invalidate_map_cache_entry_unlocked(buffer);
-    mapcache_unlock();
-}
-
-void xen_invalidate_map_cache(void)
-{
-    unsigned long i;
-    MapCacheRev *reventry;
-
-    /* Flush pending AIO before destroying the mapcache */
-    bdrv_drain_all();
-
-    mapcache_lock();
-
-    QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-        if (!reventry->dma) {
-            continue;
-        }
-        fprintf(stderr, "Locked DMA mapping while invalidating mapcache!"
-                " "HWADDR_FMT_plx" -> %p is present\n",
-                reventry->paddr_index, reventry->vaddr_req);
-    }
-
-    for (i = 0; i < mapcache->nr_buckets; i++) {
-        MapCacheEntry *entry = &mapcache->entry[i];
-
-        if (entry->vaddr_base == NULL) {
-            continue;
-        }
-        if (entry->lock > 0) {
-            continue;
-        }
-
-        if (munmap(entry->vaddr_base, entry->size) != 0) {
-            perror("unmap fails");
-            exit(-1);
-        }
-
-        entry->paddr_index = 0;
-        entry->vaddr_base = NULL;
-        entry->size = 0;
-        g_free(entry->valid_mapping);
-        entry->valid_mapping = NULL;
-    }
-
-    mapcache->last_entry = NULL;
-
-    mapcache_unlock();
-}
-
-static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
-                                                 hwaddr new_phys_addr,
-                                                 hwaddr size)
-{
-    MapCacheEntry *entry;
-    hwaddr address_index, address_offset;
-    hwaddr test_bit_size, cache_size = size;
-
-    address_index  = old_phys_addr >> MCACHE_BUCKET_SHIFT;
-    address_offset = old_phys_addr & (MCACHE_BUCKET_SIZE - 1);
-
-    assert(size);
-    /* test_bit_size is always a multiple of XC_PAGE_SIZE */
-    test_bit_size = size + (old_phys_addr & (XC_PAGE_SIZE - 1));
-    if (test_bit_size % XC_PAGE_SIZE) {
-        test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
-    }
-    cache_size = size + address_offset;
-    if (cache_size % MCACHE_BUCKET_SIZE) {
-        cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
-    }
-
-    entry = &mapcache->entry[address_index % mapcache->nr_buckets];
-    while (entry && !(entry->paddr_index == address_index &&
-                      entry->size == cache_size)) {
-        entry = entry->next;
-    }
-    if (!entry) {
-        DPRINTF("Trying to update an entry for "HWADDR_FMT_plx \
-                "that is not in the mapcache!\n", old_phys_addr);
-        return NULL;
-    }
-
-    address_index  = new_phys_addr >> MCACHE_BUCKET_SHIFT;
-    address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
-
-    fprintf(stderr, "Replacing a dummy mapcache entry for "HWADDR_FMT_plx \
-            " with "HWADDR_FMT_plx"\n", old_phys_addr, new_phys_addr);
-
-    xen_remap_bucket(entry, entry->vaddr_base,
-                     cache_size, address_index, false);
-    if (!test_bits(address_offset >> XC_PAGE_SHIFT,
-                test_bit_size >> XC_PAGE_SHIFT,
-                entry->valid_mapping)) {
-        DPRINTF("Unable to update a mapcache entry for "HWADDR_FMT_plx"!\n",
-                old_phys_addr);
-        return NULL;
-    }
-
-    return entry->vaddr_base + address_offset;
-}
-
-uint8_t *xen_replace_cache_entry(hwaddr old_phys_addr,
-                                 hwaddr new_phys_addr,
-                                 hwaddr size)
-{
-    uint8_t *p;
-
-    mapcache_lock();
-    p = xen_replace_cache_entry_unlocked(old_phys_addr, new_phys_addr, size);
-    mapcache_unlock();
-    return p;
-}