linux-kernel - [PATCH -next] RISC-V: KVM: optimize kvm_arch_hardware

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Message-ID: <20221121003915.2817102-1-chenlifu@huawei.com>
Date:   Mon, 21 Nov 2022 08:39:15 +0800
From:   Chen Lifu <chenlifu@...wei.com>
To:     <anup@...infault.org>, <atishp@...shpatra.org>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <kvm@...r.kernel.org>,
        <kvm-riscv@...ts.infradead.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <chenlifu@...wei.com>
Subject: [PATCH -next] RISC-V: KVM: optimize kvm_arch_hardware_enable()

The values of CSR_HEDELEG and CSR_HIDELEG registers are constants,
so change them from variables to macros.

Signed-off-by: Chen Lifu <chenlifu@...wei.com>
---
 arch/riscv/kvm/main.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c
index df2d8716851f..70196b03b6f9 100644
--- a/arch/riscv/kvm/main.c
+++ b/arch/riscv/kvm/main.c
@@ -12,10 +12,21 @@
 #include <linux/kvm_host.h>
 #include <asm/csr.h>
 #include <asm/hwcap.h>
 #include <asm/sbi.h>
 
+#define EXC_HEDELEG ((1UL << EXC_INST_MISALIGNED) | \
+		     (1UL << EXC_BREAKPOINT)      | \
+		     (1UL << EXC_SYSCALL)         | \
+		     (1UL << EXC_INST_PAGE_FAULT) | \
+		     (1UL << EXC_LOAD_PAGE_FAULT) | \
+		     (1UL << EXC_STORE_PAGE_FAULT))
+
+#define IRQ_HIDELEG ((1UL << IRQ_VS_SOFT)  | \
+		     (1UL << IRQ_VS_TIMER) | \
+		     (1UL << IRQ_VS_EXT))
+
 long kvm_arch_dev_ioctl(struct file *filp,
 			unsigned int ioctl, unsigned long arg)
 {
 	return -EINVAL;
 }
@@ -30,29 +41,13 @@ int kvm_arch_hardware_setup(void *opaque)
 	return 0;
 }
 
 int kvm_arch_hardware_enable(void)
 {
-	unsigned long hideleg, hedeleg;
-
-	hedeleg = 0;
-	hedeleg |= (1UL << EXC_INST_MISALIGNED);
-	hedeleg |= (1UL << EXC_BREAKPOINT);
-	hedeleg |= (1UL << EXC_SYSCALL);
-	hedeleg |= (1UL << EXC_INST_PAGE_FAULT);
-	hedeleg |= (1UL << EXC_LOAD_PAGE_FAULT);
-	hedeleg |= (1UL << EXC_STORE_PAGE_FAULT);
-	csr_write(CSR_HEDELEG, hedeleg);
-
-	hideleg = 0;
-	hideleg |= (1UL << IRQ_VS_SOFT);
-	hideleg |= (1UL << IRQ_VS_TIMER);
-	hideleg |= (1UL << IRQ_VS_EXT);
-	csr_write(CSR_HIDELEG, hideleg);
-
+	csr_write(CSR_HEDELEG, EXC_HEDELEG);
+	csr_write(CSR_HIDELEG, IRQ_HIDELEG);
 	csr_write(CSR_HCOUNTEREN, -1UL);
-
 	csr_write(CSR_HVIP, 0);
 
 	return 0;
 }
 
-- 
2.37.1