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accel/tcg: Revert mapping of PCREL translation block to multiple virtual addresses 

This is causing regressions that have not been analyzed yet.  Revert the
change on stable branches.

Cc: qemu-stable@nongnu.org
Cc: Michael Tokarev <mjt@tls.msk.ru>
Related: https://gitlab.com/qemu-project/qemu/-/issues/2092
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Paolo Bonzini 2024-01-23 12:16:52 +01:00 committed by Michael Tokarev
parent 024e8945fa
commit b67924a048
4 changed files with 5 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
accel/tcg/cpu-exec.c
View File

@ -186,7 +186,7 @@ static bool tb_lookup_cmp(const void *p, const void *d)
const TranslationBlock *tb = p;
const struct tb_desc *desc = d;
if ((TARGET_TB_PCREL || tb_pc(tb) == desc->pc) &&
if (tb_pc(tb) == desc->pc &&
tb_page_addr0(tb) == desc->page_addr0 &&
tb->cs_base == desc->cs_base &&
tb->flags == desc->flags &&
@ -238,7 +238,7 @@ static TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
return NULL;
}
desc.page_addr0 = phys_pc;
h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : pc),
h = tb_hash_func(phys_pc, pc,
flags, cflags, *cpu->trace_dstate);
return qht_lookup_custom(&tb_ctx.htable, &desc, h, tb_lookup_cmp);
}

6
accel/tcg/tb-maint.c
View File

@ -34,7 +34,7 @@ static bool tb_cmp(const void *ap, const void *bp)
const TranslationBlock *a = ap;
const TranslationBlock *b = bp;
return ((TARGET_TB_PCREL || tb_pc(a) == tb_pc(b)) &&
return (tb_pc(a) == tb_pc(b) &&
a->cs_base == b->cs_base &&
a->flags == b->flags &&
(tb_cflags(a) & ~CF_INVALID) == (tb_cflags(b) & ~CF_INVALID) &&
@ -269,7 +269,7 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool rm_from_page_list)
/* remove the TB from the hash list */
phys_pc = tb_page_addr0(tb);
h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : tb_pc(tb)),
h = tb_hash_func(phys_pc, tb_pc(tb),
tb->flags, orig_cflags, tb->trace_vcpu_dstate);
if (!qht_remove(&tb_ctx.htable, tb, h)) {
return;
@ -459,7 +459,7 @@ TranslationBlock *tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
}
/* add in the hash table */
h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : tb_pc(tb)),
h = tb_hash_func(phys_pc, tb_pc(tb),
tb->flags, tb->cflags, tb->trace_vcpu_dstate);
qht_insert(&tb_ctx.htable, tb, h, &existing_tb);

2
accel/tcg/translate-all.c
View File

@ -818,9 +818,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
gen_code_buf = tcg_ctx->code_gen_ptr;
tb->tc.ptr = tcg_splitwx_to_rx(gen_code_buf);
#if !TARGET_TB_PCREL
tb->pc = pc;
#endif
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;

6
include/exec/exec-all.h
View File

@ -503,7 +503,6 @@ struct tb_tc {
};
struct TranslationBlock {
#if !TARGET_TB_PCREL
/*
* Guest PC corresponding to this block. This must be the true
* virtual address. Therefore e.g. x86 stores EIP + CS_BASE, and
@ -518,7 +517,6 @@ struct TranslationBlock {
* deposited into the "current" PC.
*/
target_ulong pc;
#endif
/*
* Target-specific data associated with the TranslationBlock, e.g.:
@ -604,11 +602,7 @@ struct TranslationBlock {
/* Hide the read to avoid ifdefs for TARGET_TB_PCREL. */
static inline target_ulong tb_pc(const TranslationBlock *tb)
{
#if TARGET_TB_PCREL
qemu_build_not_reached();
#else
return tb->pc;
#endif
}
/* Hide the qatomic_read to make code a little easier on the eyes */