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Message-Id: <20230915014949.1222777-13-zhaotianrui@loongson.cn>
Date: Fri, 15 Sep 2023 09:49:32 +0800
From: Tianrui Zhao <zhaotianrui@...ngson.cn>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
Mark Brown <broonie@...nel.org>,
Alex Deucher <alexander.deucher@....com>,
Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
Xi Ruoyao <xry111@...111.site>, zhaotianrui@...ngson.cn
Subject: [PATCH v21 12/29] LoongArch: KVM: Implement vcpu interrupt operations
Implement vcpu interrupt operations such as vcpu set irq and
vcpu clear irq, using set_gcsr_estat to set irq which is
parsed by the irq bitmap.
Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
arch/loongarch/kvm/interrupt.c | 185 +++++++++++++++++++++++++++++++++
arch/loongarch/kvm/vcpu.c | 37 +++++++
2 files changed, 222 insertions(+)
create mode 100644 arch/loongarch/kvm/interrupt.c
diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c
new file mode 100644
index 0000000000..9df75a564e
--- /dev/null
+++ b/arch/loongarch/kvm/interrupt.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <asm/kvm_vcpu.h>
+#include <asm/kvm_csr.h>
+
+static unsigned int int_to_coreint[EXCCODE_INT_NUM] = {
+ [INT_TI] = CPU_TIMER,
+ [INT_IPI] = CPU_IPI,
+ [INT_SWI0] = CPU_SIP0,
+ [INT_SWI1] = CPU_SIP1,
+ [INT_HWI0] = CPU_IP0,
+ [INT_HWI1] = CPU_IP1,
+ [INT_HWI2] = CPU_IP2,
+ [INT_HWI3] = CPU_IP3,
+ [INT_HWI4] = CPU_IP4,
+ [INT_HWI5] = CPU_IP5,
+ [INT_HWI6] = CPU_IP6,
+ [INT_HWI7] = CPU_IP7,
+};
+
+static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
+{
+ unsigned int irq = 0;
+
+ clear_bit(priority, &vcpu->arch.irq_pending);
+ if (priority < EXCCODE_INT_NUM)
+ irq = int_to_coreint[priority];
+
+ switch (priority) {
+ case INT_TI:
+ case INT_IPI:
+ case INT_SWI0:
+ case INT_SWI1:
+ set_gcsr_estat(irq);
+ break;
+
+ case INT_HWI0 ... INT_HWI7:
+ set_csr_gintc(irq);
+ break;
+
+ default:
+ break;
+ }
+
+ return 1;
+}
+
+static int kvm_irq_clear(struct kvm_vcpu *vcpu, unsigned int priority)
+{
+ unsigned int irq = 0;
+
+ clear_bit(priority, &vcpu->arch.irq_clear);
+ if (priority < EXCCODE_INT_NUM)
+ irq = int_to_coreint[priority];
+
+ switch (priority) {
+ case INT_TI:
+ case INT_IPI:
+ case INT_SWI0:
+ case INT_SWI1:
+ clear_gcsr_estat(irq);
+ break;
+
+ case INT_HWI0 ... INT_HWI7:
+ clear_csr_gintc(irq);
+ break;
+
+ default:
+ break;
+ }
+
+ return 1;
+}
+
+void kvm_deliver_intr(struct kvm_vcpu *vcpu)
+{
+ unsigned long *pending = &vcpu->arch.irq_pending;
+ unsigned long *pending_clr = &vcpu->arch.irq_clear;
+ unsigned int priority;
+
+ if (!(*pending) && !(*pending_clr))
+ return;
+
+ if (*pending_clr) {
+ priority = __ffs(*pending_clr);
+ while (priority <= INT_IPI) {
+ kvm_irq_clear(vcpu, priority);
+ priority = find_next_bit(pending_clr,
+ BITS_PER_BYTE * sizeof(*pending_clr),
+ priority + 1);
+ }
+ }
+
+ if (*pending) {
+ priority = __ffs(*pending);
+ while (priority <= INT_IPI) {
+ kvm_irq_deliver(vcpu, priority);
+ priority = find_next_bit(pending,
+ BITS_PER_BYTE * sizeof(*pending),
+ priority + 1);
+ }
+ }
+}
+
+int kvm_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return test_bit(INT_TI, &vcpu->arch.irq_pending);
+}
+
+/*
+ * Only support illegal instruction or illegal Address Error exception,
+ * Other exceptions are injected by hardware in kvm mode
+ */
+static void kvm_exception_deliver(struct kvm_vcpu *vcpu, unsigned int code,
+ unsigned int subcode)
+{
+ unsigned long val, vec_size;
+
+ /*
+ * BADV is added for EXCCODE_ADE exception
+ * Use pc register (gva address) if it is instruction exeception
+ * Else use badv from host side (gpa address) for data exeception
+ */
+ if (code == EXCCODE_ADE) {
+ if (subcode == EXSUBCODE_ADEF)
+ val = vcpu->arch.pc;
+ else
+ val = vcpu->arch.badv;
+ kvm_write_hw_gcsr(LOONGARCH_CSR_BADV, val);
+ }
+
+ /* set exception instruction */
+ kvm_write_hw_gcsr(LOONGARCH_CSR_BADI, vcpu->arch.badi);
+
+ /*
+ * save crmd in prmd
+ * set IRQ disabled and PLV0 with crmd
+ */
+ val = kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD);
+ kvm_write_hw_gcsr(LOONGARCH_CSR_PRMD, val);
+ val = val & ~(CSR_CRMD_PLV | CSR_CRMD_IE);
+ kvm_write_hw_gcsr(LOONGARCH_CSR_CRMD, val);
+
+ /* set exception pc address */
+ kvm_write_hw_gcsr(LOONGARCH_CSR_ERA, vcpu->arch.pc);
+
+ /*
+ * set exception code
+ * exception and interrupt can be inject at the same time
+ * hardware will handle exception first and then extern interrupt
+ * exception code is Ecode in ESTAT[16:21]
+ * interrupt code in ESTAT[0:12]
+ */
+ val = kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT);
+ val = (val & ~CSR_ESTAT_EXC) | code;
+ kvm_write_hw_gcsr(LOONGARCH_CSR_ESTAT, val);
+
+ /*
+ * calculate expcetion entry address
+ */
+ val = kvm_read_hw_gcsr(LOONGARCH_CSR_ECFG);
+ vec_size = (val & CSR_ECFG_VS) >> CSR_ECFG_VS_SHIFT;
+ if (vec_size)
+ vec_size = (1 << vec_size) * 4;
+ val = kvm_read_hw_gcsr(LOONGARCH_CSR_EENTRY);
+ vcpu->arch.pc = val + code * vec_size;
+}
+
+void kvm_deliver_exception(struct kvm_vcpu *vcpu)
+{
+ unsigned long *pending = &vcpu->arch.exception_pending;
+ unsigned int code;
+
+ if (*pending) {
+ code = __ffs(*pending);
+ kvm_exception_deliver(vcpu, code, vcpu->arch.subcode);
+ *pending = 0;
+ vcpu->arch.subcode = 0;
+ }
+}
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index b8af4a200c..191d9f5517 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -336,6 +336,43 @@ void kvm_lose_fpu(struct kvm_vcpu *vcpu)
preempt_enable();
}
+int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
+{
+ int intr = (int)irq->irq;
+
+ if (intr > 0)
+ kvm_queue_irq(vcpu, intr);
+ else if (intr < 0)
+ kvm_dequeue_irq(vcpu, -intr);
+ else {
+ kvm_err("%s: invalid interrupt ioctl %d\n", __func__, irq->irq);
+ return -EINVAL;
+ }
+
+ kvm_vcpu_kick(vcpu);
+ return 0;
+}
+
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+
+ if (ioctl == KVM_INTERRUPT) {
+ struct kvm_interrupt irq;
+
+ if (copy_from_user(&irq, argp, sizeof(irq)))
+ return -EFAULT;
+
+ kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, irq.irq);
+
+ return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
+ }
+
+ return -ENOIOCTLCMD;
+}
+
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
--
2.39.1
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