diff mbox series

[v5,1/7] trans_rvv.c.inc: mark_vs_dirty() before loads and stores

Message ID 20240221022252.252872-2-dbarboza@ventanamicro.com
State New
Headers show
Series riscv: set vstart_eq_zero on mark_vs_dirty | expand

Commit Message

Daniel Henrique Barboza Feb. 21, 2024, 2:22 a.m. UTC 
While discussing a problem with how we're (not) setting vstart_eq_zero
Richard had the following to say w.r.t the conditional mark_vs_dirty()
calls on load/store functions [1]:

"I think it's required to have stores set dirty unconditionally, before
the operation.

Consider a store that traps on the 2nd element, leaving vstart = 2, and
exiting to the main loop via exception. The exception enters the kernel
page fault handler. The kernel may need to fault in the page for the
process, and in the meantime task switch.

If vs dirty is not already set, the kernel won't know to save vector
state on task switch."

Do a mark_vs_dirty() before both loads and stores.

[1] https://lore.kernel.org/qemu-riscv/72c7503b-0f43-44b8-aa82-fbafed2aac0c@linaro.org/

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/insn_trans/trans_rvv.c.inc | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)
diff mbox series

Patch

diff --git a/target/riscv/insn_trans/trans_rvv.c.inc b/target/riscv/insn_trans/trans_rvv.c.inc
index 9e101ab434..7a98f1caa6 100644
--- a/target/riscv/insn_trans/trans_rvv.c.inc
+++ b/target/riscv/insn_trans/trans_rvv.c.inc
@@ -636,11 +636,9 @@  static bool ldst_us_trans(uint32_t vd, uint32_t rs1, uint32_t data,
     tcg_gen_addi_ptr(dest, tcg_env, vreg_ofs(s, vd));
     tcg_gen_addi_ptr(mask, tcg_env, vreg_ofs(s, 0));
 
-    fn(dest, mask, base, tcg_env, desc);
+    mark_vs_dirty(s);
 
-    if (!is_store) {
-        mark_vs_dirty(s);
-    }
+    fn(dest, mask, base, tcg_env, desc);
 
     gen_set_label(over);
     return true;
@@ -797,11 +795,9 @@  static bool ldst_stride_trans(uint32_t vd, uint32_t rs1, uint32_t rs2,
     tcg_gen_addi_ptr(dest, tcg_env, vreg_ofs(s, vd));
     tcg_gen_addi_ptr(mask, tcg_env, vreg_ofs(s, 0));
 
-    fn(dest, mask, base, stride, tcg_env, desc);
+    mark_vs_dirty(s);
 
-    if (!is_store) {
-        mark_vs_dirty(s);
-    }
+    fn(dest, mask, base, stride, tcg_env, desc);
 
     gen_set_label(over);
     return true;
@@ -904,11 +900,9 @@  static bool ldst_index_trans(uint32_t vd, uint32_t rs1, uint32_t vs2,
     tcg_gen_addi_ptr(index, tcg_env, vreg_ofs(s, vs2));
     tcg_gen_addi_ptr(mask, tcg_env, vreg_ofs(s, 0));
 
-    fn(dest, mask, base, index, tcg_env, desc);
+    mark_vs_dirty(s);
 
-    if (!is_store) {
-        mark_vs_dirty(s);
-    }
+    fn(dest, mask, base, index, tcg_env, desc);
 
     gen_set_label(over);
     return true;
@@ -1102,11 +1096,10 @@  static bool ldst_whole_trans(uint32_t vd, uint32_t rs1, uint32_t nf,
     base = get_gpr(s, rs1, EXT_NONE);
     tcg_gen_addi_ptr(dest, tcg_env, vreg_ofs(s, vd));
 
+    mark_vs_dirty(s);
+
     fn(dest, base, tcg_env, desc);
 
-    if (!is_store) {
-        mark_vs_dirty(s);
-    }
     gen_set_label(over);
 
     return true;