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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 1/8] xen: mapcache: Make MCACHE_BUCKET_SHIFT runtime configurable
From: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxx>
Make MCACHE_BUCKET_SHIFT runtime configurable per cache instance.
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
hw/xen/xen-mapcache.c | 54 ++++++++++++++++++++++++++-----------------
1 file changed, 33 insertions(+), 21 deletions(-)
diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c
index fa6813b1ad..bc860f4373 100644
--- a/hw/xen/xen-mapcache.c
+++ b/hw/xen/xen-mapcache.c
@@ -23,13 +23,10 @@
#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.
@@ -65,7 +62,8 @@ typedef struct MapCache {
/* For most cases (>99.9%), the page address is the same. */
MapCacheEntry *last_entry;
unsigned long max_mcache_size;
- unsigned int mcache_bucket_shift;
+ unsigned int bucket_shift;
+ unsigned long bucket_size;
phys_offset_to_gaddr_t phys_offset_to_gaddr;
QemuMutex lock;
@@ -95,11 +93,14 @@ static inline int test_bits(int nr, int size, const
unsigned long *addr)
static MapCache *xen_map_cache_init_single(phys_offset_to_gaddr_t f,
void *opaque,
+ unsigned int bucket_shift,
unsigned long max_size)
{
unsigned long size;
MapCache *mc;
+ assert(bucket_shift >= XC_PAGE_SHIFT);
+
mc = g_new0(MapCache, 1);
mc->phys_offset_to_gaddr = f;
@@ -108,12 +109,14 @@ static MapCache
*xen_map_cache_init_single(phys_offset_to_gaddr_t f,
QTAILQ_INIT(&mc->locked_entries);
+ mc->bucket_shift = bucket_shift;
+ mc->bucket_size = 1UL << bucket_shift;
mc->max_mcache_size = max_size;
mc->nr_buckets =
(((mc->max_mcache_size >> XC_PAGE_SHIFT) +
- (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
- (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
+ (1UL << (bucket_shift - XC_PAGE_SHIFT)) - 1) >>
+ (bucket_shift - XC_PAGE_SHIFT));
size = mc->nr_buckets * sizeof(MapCacheEntry);
size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
@@ -126,6 +129,13 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void
*opaque)
{
struct rlimit rlimit_as;
unsigned long max_mcache_size;
+ unsigned int bucket_shift;
+
+ if (HOST_LONG_BITS == 32) {
+ bucket_shift = 16;
+ } else {
+ bucket_shift = 20;
+ }
if (geteuid() == 0) {
rlimit_as.rlim_cur = RLIM_INFINITY;
@@ -146,7 +156,9 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void
*opaque)
}
}
- mapcache = xen_map_cache_init_single(f, opaque, max_mcache_size);
+ mapcache = xen_map_cache_init_single(f, opaque,
+ bucket_shift,
+ max_mcache_size);
setrlimit(RLIMIT_AS, &rlimit_as);
}
@@ -195,7 +207,7 @@ static void xen_remap_bucket(MapCache *mc,
entry->valid_mapping = NULL;
for (i = 0; i < nb_pfn; i++) {
- pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
+ pfns[i] = (address_index << (mc->bucket_shift - XC_PAGE_SHIFT)) + i;
}
/*
@@ -266,8 +278,8 @@ static uint8_t *xen_map_cache_unlocked(MapCache *mc,
bool dummy = false;
tryagain:
- address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
- address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
+ address_index = phys_addr >> mc->bucket_shift;
+ address_offset = phys_addr & (mc->bucket_size - 1);
trace_xen_map_cache(phys_addr);
@@ -294,14 +306,14 @@ tryagain:
return mc->last_entry->vaddr_base + address_offset;
}
- /* size is always a multiple of MCACHE_BUCKET_SIZE */
+ /* size is always a multiple of mc->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);
+ if (cache_size % mc->bucket_size) {
+ cache_size += mc->bucket_size - (cache_size % mc->bucket_size);
}
} else {
- cache_size = MCACHE_BUCKET_SIZE;
+ cache_size = mc->bucket_size;
}
entry = &mc->entry[address_index % mc->nr_buckets];
@@ -422,7 +434,7 @@ static ram_addr_t
xen_ram_addr_from_mapcache_single(MapCache *mc, void *ptr)
trace_xen_ram_addr_from_mapcache_not_in_cache(ptr);
raddr = RAM_ADDR_INVALID;
} else {
- raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
+ raddr = (reventry->paddr_index << mc->bucket_shift) +
((unsigned long) ptr - (unsigned long) entry->vaddr_base);
}
mapcache_unlock(mc);
@@ -585,8 +597,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache
*mc,
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);
+ address_index = old_phys_addr >> mc->bucket_shift;
+ address_offset = old_phys_addr & (mc->bucket_size - 1);
assert(size);
/* test_bit_size is always a multiple of XC_PAGE_SIZE */
@@ -595,8 +607,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache
*mc,
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);
+ if (cache_size % mc->bucket_size) {
+ cache_size += mc->bucket_size - (cache_size % mc->bucket_size);
}
entry = &mc->entry[address_index % mc->nr_buckets];
@@ -609,8 +621,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache
*mc,
return NULL;
}
- address_index = new_phys_addr >> MCACHE_BUCKET_SHIFT;
- address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
+ address_index = new_phys_addr >> mc->bucket_shift;
+ address_offset = new_phys_addr & (mc->bucket_size - 1);
trace_xen_replace_cache_entry_dummy(old_phys_addr, new_phys_addr);
--
2.40.1
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