xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2024-11-27 21:40:49 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

target-s390x: use softmmu functions for mvcp/mvcs

Browse Source 
mvcp and mvcs helper get access to the physical memory by a call to
mmu_translate for the virtual to real conversion and then using ldb_phys
and stb_phys to physically access the data. In practice this is quite
slow because it bypasses the QEMU softmmu TLB and because stb_phys calls
try to invalidate the corresponding memory for each access.

Instead use cpu_ldb_{primary,secondary} for the loads and
cpu_stb_{primary,secondary} for the stores. Ideally this should be
further optimized by a call to memcpy, but that already improves the
boot time of a guest by a factor 1.8.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2015-06-03 23:09:55 +02:00 committed by Alexander Graf
parent c255ac6012
commit a3084e8055
1 changed files with 21 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
target-s390x/mem_helper.c
View File

@ -1015,59 +1015,46 @@ uint32_t HELPER(csp)(CPUS390XState *env, uint32_t r1, uint64_t r2)
return cc;
}
static uint32_t mvc_asc(CPUS390XState *env, int64_t l, uint64_t a1,
uint64_t mode1, uint64_t a2, uint64_t mode2)
uint32_t HELPER(mvcs)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
target_ulong src, dest;
int flags, cc = 0, i;
int cc = 0, i;
if (!l) {
return 0;
} else if (l > 256) {
HELPER_LOG("%s: %16" PRIx64 " %16" PRIx64 " %16" PRIx64 "\n",
__func__, l, a1, a2);
if (l > 256) {
/* max 256 */
l = 256;
cc = 3;
}
if (mmu_translate(env, a1, 1, mode1, &dest, &flags, true)) {
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
}
dest |= a1 & ~TARGET_PAGE_MASK;
if (mmu_translate(env, a2, 0, mode2, &src, &flags, true)) {
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
}
src |= a2 & ~TARGET_PAGE_MASK;
/* XXX replace w/ memcpy */
for (i = 0; i < l; i++) {
/* XXX be more clever */
if ((((dest + i) & TARGET_PAGE_MASK) != (dest & TARGET_PAGE_MASK)) ||
(((src + i) & TARGET_PAGE_MASK) != (src & TARGET_PAGE_MASK))) {
mvc_asc(env, l - i, a1 + i, mode1, a2 + i, mode2);
break;
}
stb_phys(cs->as, dest + i, ldub_phys(cs->as, src + i));
cpu_stb_secondary(env, a1 + i, cpu_ldub_primary(env, a2 + i));
}
return cc;
}
uint32_t HELPER(mvcs)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
{
HELPER_LOG("%s: %16" PRIx64 " %16" PRIx64 " %16" PRIx64 "\n",
__func__, l, a1, a2);
return mvc_asc(env, l, a1, PSW_ASC_SECONDARY, a2, PSW_ASC_PRIMARY);
}
uint32_t HELPER(mvcp)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
{
int cc = 0, i;
HELPER_LOG("%s: %16" PRIx64 " %16" PRIx64 " %16" PRIx64 "\n",
__func__, l, a1, a2);
return mvc_asc(env, l, a1, PSW_ASC_PRIMARY, a2, PSW_ASC_SECONDARY);
if (l > 256) {
/* max 256 */
l = 256;
cc = 3;
}
/* XXX replace w/ memcpy */
for (i = 0; i < l; i++) {
cpu_stb_primary(env, a1 + i, cpu_ldub_secondary(env, a2 + i));
}
return cc;
}
/* invalidate pte */