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LoongArch: KVM: Access mailbox directly in mail_send()

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With function mail_send(), it is to write mailbox of other VCPUs.
Existing simple APIs read_mailbox()/write_mailbox() can be used directly
rather than send command on IOCSR address.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-09-23 23:37:09 +08:00 committed by Huacai Chen
parent 1cf7b2881d
commit 3da2b0d439
1 changed files with 28 additions and 17 deletions
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45
arch/loongarch/kvm/intc/ipi.c
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@ -101,6 +101,34 @@ static void write_mailbox(struct kvm_vcpu *vcpu, int offset, uint64_t data, int
spin_unlock(&vcpu->arch.ipi_state.lock);
}
static int mail_send(struct kvm *kvm, uint64_t data)
{
int i, cpu, mailbox, offset;
uint32_t val = 0, mask = 0;
struct kvm_vcpu *vcpu;
cpu = ((data & 0xffffffff) >> 16) & 0x3ff;
vcpu = kvm_get_vcpu_by_cpuid(kvm, cpu);
if (unlikely(vcpu == NULL)) {
kvm_err("%s: invalid target cpu: %d\n", __func__, cpu);
return -EINVAL;
}
mailbox = ((data & 0xffffffff) >> 2) & 0x7;
offset = IOCSR_IPI_BUF_20 + mailbox * 4;
if ((data >> 27) & 0xf) {
val = read_mailbox(vcpu, offset, 4);
for (i = 0; i < 4; i++)
if (data & (BIT(27 + i)))
mask |= (0xff << (i * 8));
val &= mask;
}
val |= ((uint32_t)(data >> 32) & ~mask);
write_mailbox(vcpu, offset, val, 4);
return 0;
}
static int send_ipi_data(struct kvm_vcpu *vcpu, gpa_t addr, uint64_t data)
{
int i, idx, ret;
@ -137,23 +165,6 @@ static int send_ipi_data(struct kvm_vcpu *vcpu, gpa_t addr, uint64_t data)
return ret;
}
static int mail_send(struct kvm *kvm, uint64_t data)
{
int cpu, mailbox, offset;
struct kvm_vcpu *vcpu;
cpu = ((data & 0xffffffff) >> 16) & 0x3ff;
vcpu = kvm_get_vcpu_by_cpuid(kvm, cpu);
if (unlikely(vcpu == NULL)) {
kvm_err("%s: invalid target cpu: %d\n", __func__, cpu);
return -EINVAL;
}
mailbox = ((data & 0xffffffff) >> 2) & 0x7;
offset = IOCSR_IPI_BASE + IOCSR_IPI_BUF_20 + mailbox * 4;
return send_ipi_data(vcpu, offset, data);
}
static int any_send(struct kvm *kvm, uint64_t data)
{
int cpu, offset;