This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new f7abf7446f arch/arm64: Optimized SGI to avoid VM exit.
f7abf7446f is described below
commit f7abf7446f342bcccb133577b181c69321106bf0
Author: ouyangxiangzhen <[email protected]>
AuthorDate: Thu Nov 7 19:55:41 2024 +0800
arch/arm64: Optimized SGI to avoid VM exit.
In the virtualized environment, each time an SGI is sent, the value of
IGROUPR0 needs to be read once. Since the GIC Redistributor is a purely
emulated device, each read of IGROUPR0 will cause a VM exit, causing serious
performance degradation. This patch replaces the read with the value previously
set in `gicv3_cpuif_init`, and we assume that this value has not been modified
after initialization.
Signed-off-by: ouyangxiangzhen <[email protected]>
---
arch/arm64/src/common/arm64_gicv3.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/src/common/arm64_gicv3.c
b/arch/arm64/src/common/arm64_gicv3.c
index 74b2859966..3852fd1c06 100644
--- a/arch/arm64/src/common/arm64_gicv3.c
+++ b/arch/arm64/src/common/arm64_gicv3.c
@@ -378,9 +378,7 @@ static int arm64_gic_send_sgi(unsigned int sgi_id, uint64_t
target_aff,
uint32_t aff1;
uint64_t sgi_val;
uint32_t regval;
- unsigned long base;
- base = gic_get_rdist() + GICR_SGI_BASE_OFF;
ASSERT(GIC_IS_SGI(sgi_id));
/* Extract affinity fields from target */
@@ -394,7 +392,9 @@ static int arm64_gic_send_sgi(unsigned int sgi_id, uint64_t
target_aff,
ARM64_DSB();
- regval = getreg32(IGROUPR(base, 0));
+ /* Read the IGROUPR0 value we set in `gicv3_cpuif_init` */
+
+ regval = IGROUPR_SGI_VAL;
if (regval & BIT(sgi_id))
{
