github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 00:53:34 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

LoongArch: KVM: Rework kvm_send_pv_ipi()

Browse Source 
The function in fact traverses a "bitmap" stored in GPR regs A1 and A2,
but does it in a non-obvious way by creating a single-word bitmap twice.

This patch switches the function to create a single 2-word bitmap, and
also employs for_each_set_bit() macro, as it helps to drop most of the
housekeeping code.

While there, convert the function to return void to not confuse readers
with unchecked result.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Yury Norov (NVIDIA) 2025-07-21 09:26:32 +08:00 committed by Huacai Chen
parent 89be9a83cc
commit 640f8424ca
1 changed files with 12 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
arch/loongarch/kvm/exit.c
View File

@ -821,32 +821,25 @@ static int kvm_handle_lbt_disabled(struct kvm_vcpu *vcpu, int ecode)
return RESUME_GUEST;
}
static int kvm_send_pv_ipi(struct kvm_vcpu *vcpu)
static void kvm_send_pv_ipi(struct kvm_vcpu *vcpu)
{
unsigned int min, cpu, i;
unsigned long ipi_bitmap;
unsigned int min, cpu;
struct kvm_vcpu *dest;
DECLARE_BITMAP(ipi_bitmap, BITS_PER_LONG * 2) = {
kvm_read_reg(vcpu, LOONGARCH_GPR_A1),
kvm_read_reg(vcpu, LOONGARCH_GPR_A2)
};
min = kvm_read_reg(vcpu, LOONGARCH_GPR_A3);
for (i = 0; i < 2; i++, min += BITS_PER_LONG) {
ipi_bitmap = kvm_read_reg(vcpu, LOONGARCH_GPR_A1 + i);
if (!ipi_bitmap)
for_each_set_bit(cpu, ipi_bitmap, BITS_PER_LONG * 2) {
dest = kvm_get_vcpu_by_cpuid(vcpu->kvm, cpu + min);
if (!dest)
continue;
cpu = find_first_bit((void *)&ipi_bitmap, BITS_PER_LONG);
while (cpu < BITS_PER_LONG) {
dest = kvm_get_vcpu_by_cpuid(vcpu->kvm, cpu + min);
cpu = find_next_bit((void *)&ipi_bitmap, BITS_PER_LONG, cpu + 1);
if (!dest)
continue;
/* Send SWI0 to dest vcpu to emulate IPI interrupt */
kvm_queue_irq(dest, INT_SWI0);
kvm_vcpu_kick(dest);
}
/* Send SWI0 to dest vcpu to emulate IPI interrupt */
kvm_queue_irq(dest, INT_SWI0);
kvm_vcpu_kick(dest);
}
return 0;
}
/*