From:   Tianrui Zhao <zhaotianrui@loongson.cn>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Mark Brown <broonie@kernel.org>,
        Alex Deucher <alexander.deucher@amd.com>,
        Oliver Upton <oliver.upton@linux.dev>, maobibo@loongson.cn,
        Xi Ruoyao <xry111@xry111.site>
Subject: [PATCH v4 13/29] LoongArch: KVM: Implement misc vcpu related interfaces
Date:   Tue, 21 Mar 2023 11:56:35 +0800
Message-Id: <20230321035651.598505-14-zhaotianrui@loongson.cn>
In-Reply-To: <20230321035651.598505-1-zhaotianrui@loongson.cn>
References: <20230321035651.598505-1-zhaotianrui@loongson.cn>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Implement some misc vcpu relaterd interfaces, such as vcpu runnable,
vcpu should kick, vcpu dump regs, etc.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/vcpu.c | 95 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 4c3b41fd1..131aa2240 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,101 @@
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
+{
+	return !!(vcpu->arch.irq_pending);
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
+{
+	return false;
+}
+
+vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+	return VM_FAULT_SIGBUS;
+}
+
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+				  struct kvm_translation *tr)
+{
+	return -EINVAL;
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+	return _kvm_pending_timer(vcpu) ||
+		kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) &
+			(1 << (EXCCODE_TIMER - EXCCODE_INT_START));
+}
+
+int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
+{
+	int i;
+
+	if (!vcpu)
+		return -1;
+
+	kvm_debug("VCPU Register Dump:\n");
+	kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
+	kvm_debug("\texceptions: %08lx\n", vcpu->arch.irq_pending);
+
+	for (i = 0; i < 32; i += 4) {
+		kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
+		       vcpu->arch.gprs[i],
+		       vcpu->arch.gprs[i + 1],
+		       vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
+	}
+
+	kvm_debug("\tCRMOD: 0x%08llx, exst: 0x%08llx\n",
+		  kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD),
+		  kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT));
+
+	kvm_debug("\tERA: 0x%08llx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA));
+
+	return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+					struct kvm_guest_debug *dbg)
+{
+	return -EINVAL;
+}
+
+/**
+ * kvm_migrate_count() - Migrate timer.
+ * @vcpu:       Virtual CPU.
+ *
+ * Migrate hrtimer to the current CPU by cancelling and restarting it
+ * if it was running prior to being cancelled.
+ *
+ * Must be called when the VCPU is migrated to a different CPU to ensure that
+ * timer expiry during guest execution interrupts the guest and causes the
+ * interrupt to be delivered in a timely manner.
+ */
+static void kvm_migrate_count(struct kvm_vcpu *vcpu)
+{
+	if (hrtimer_cancel(&vcpu->arch.swtimer))
+		hrtimer_restart(&vcpu->arch.swtimer);
+}
+
 int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v)
 {
 	unsigned long val;
-- 
2.31.1