[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RFC v2 PATCH 13/13] tcg: Generate fences only for SMP MTTC
From: |
Pranith Kumar |
Subject: |
[Qemu-devel] [RFC v2 PATCH 13/13] tcg: Generate fences only for SMP MTTCG guests |
Date: |
Tue, 31 May 2016 14:39:28 -0400 |
We need to generate fence instructions only for SMP MTTCG guests. This
patch enforces that.
Signed-off-by: Pranith Kumar <address@hidden>
---
tcg/tcg-op.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index a6f01a7..eeb0d0c 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -36,6 +36,8 @@ extern TCGv_i32 TCGV_HIGH_link_error(TCGv_i64);
#define TCGV_HIGH TCGV_HIGH_link_error
#endif
+extern int smp_cpus;
+
/* Note that this is optimized for sequential allocation during translate.
Up to and including filling in the forward link immediately. We'll do
proper termination of the end of the list after we finish translation. */
@@ -145,8 +147,9 @@ void tcg_gen_op6(TCGContext *ctx, TCGOpcode opc, TCGArg a1,
TCGArg a2,
void tcg_gen_mb(TCGArg a)
{
- /* ??? Enable only when MTTCG is enabled. */
- tcg_gen_op1(&tcg_ctx, INDEX_op_mb, 0);
+ if (qemu_tcg_mttcg_enabled() && smp_cpus > 1) {
+ tcg_gen_op1(&tcg_ctx, INDEX_op_mb, 0);
+ }
}
/* 32 bit ops */
--
2.8.3
- [Qemu-devel] [RFC v2 PATCH 00/13] tcg: Add fence gen support, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 05/13] tcg/ia64: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 06/13] tcg/mips: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 07/13] tcg/ppc: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 04/13] tcg/arm: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 01/13] Introduce TCGOpcode for memory barrier, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 08/13] tcg/s390: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 10/13] tcg/tci: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 13/13] tcg: Generate fences only for SMP MTTCG guests,
Pranith Kumar <=
- [Qemu-devel] [RFC v2 PATCH 02/13] tcg/i386: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 09/13] tcg/sparc: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 03/13] tcg/aarch64: Add support for fence, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 11/13] target-arm: Generate fences in ARMv7 frontend, Pranith Kumar, 2016/05/31
- [Qemu-devel] [RFC v2 PATCH 12/13] target-alpha: Generate fence op, Pranith Kumar, 2016/05/31
- Re: [Qemu-devel] [RFC v2 PATCH 00/13] tcg: Add fence gen support, Pranith Kumar, 2016/05/31