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arch/arm64: Optimized SGI to avoid VM exit.

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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 <ouyangxiangzhen@xiaomi.com>
This commit is contained in:
ouyangxiangzhen
2024-11-07 19:55:41 +08:00
committed by Xiang Xiao
parent ed8bfdd26a
commit f7abf7446f
1 changed files with 3 additions and 3 deletions
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arch/arm64/src/common/arm64_gicv3.c
+3 -3
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@@ -378,9 +378,7 @@ static int arm64_gic_send_sgi(unsigned int sgi_id, uint64_t target_aff,
uint32_t aff1; uint32_t aff1;
uint64_t sgi_val; uint64_t sgi_val;
uint32_t regval; uint32_t regval;
unsigned long base;
base = gic_get_rdist() + GICR_SGI_BASE_OFF;
ASSERT(GIC_IS_SGI(sgi_id)); ASSERT(GIC_IS_SGI(sgi_id));
/* Extract affinity fields from target */ /* 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(); 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)) if (regval & BIT(sgi_id))
{ {