diff mbox series

[v1,20/24] LoongArch: KVM: Implement handle fpu exception

Message ID	20230214025648.1898508-21-zhaotianrui@loongson.cn
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; 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> Subject: [PATCH v1 20/24] LoongArch: KVM: Implement handle fpu exception Date: Tue, 14 Feb 2023 10:56:44 +0800 Message-Id: <20230214025648.1898508-21-zhaotianrui@loongson.cn> In-Reply-To: <20230214025648.1898508-1-zhaotianrui@loongson.cn> References: <20230214025648.1898508-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add KVM LoongArch support \| [v1,00/24] Add KVM LoongArch support [v1,01/24] LoongArch: KVM: Implement kvm module related interface [v1,02/24] LoongArch: KVM: Implement VM related functions [v1,03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations. [v1,04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers [v1,05/24] LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface [v1,06/24] LoongArch: KVM: Implement fpu related operations for vcpu [v1,07/24] LoongArch: KVM: Implement vcpu interrupt operations [v1,08/24] LoongArch: KVM: Implement misc vcpu related interfaces [v1,09/24] LoongArch: KVM: Implement vcpu load and vcpu put operations [v1,10/24] LoongArch: KVM: Implement vcpu status description [v1,11/24] LoongArch: KVM: Implement update VM id function [v1,12/24] LoongArch: KVM: Implement virtual machine tlb operations [v1,13/24] LoongArch: KVM: Implement vcpu timer operations [v1,14/24] LoongArch: KVM: Implement kvm mmu operations [v1,15/24] LoongArch: KVM: Implement handle csr excption [v1,16/24] LoongArch: KVM: Implement handle iocsr exception [v1,17/24] LoongArch: KVM: Implement handle idle exception [v1,18/24] LoongArch: KVM: Implement handle gspr exception [v1,19/24] LoongArch: KVM: Implement handle mmio exception [v1,20/24] LoongArch: KVM: Implement handle fpu exception [v1,21/24] LoongArch: KVM: Implement kvm exception vector [v1,22/24] LoongArch: KVM: Implement vcpu world switch [v1,23/24] LoongArch: KVM: Implement probe virtualization when loongarch cpu init [v1,24/24] LoongArch: KVM: Enable kvm config and add the makefile

Commit Message

zhaotianrui Feb. 14, 2023, 2:56 a.m. UTC

  Implement handle fpu exception, using kvm_own_fpu to enable fpu for
guest.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/exit.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff mbox series

Patch

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 30e64ba72..89c90faa1 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -625,3 +625,30 @@  static int _kvm_handle_read_fault(struct kvm_vcpu *vcpu)
 {
 	return _kvm_handle_mmu_fault(vcpu, false);
 }
+
+/**
+ * _kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host
+ * @vcpu:	Virtual CPU context.
+ *
+ * Handle when the guest attempts to use fpu which hasn't been allowed
+ * by the root context.
+ */
+static int _kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+
+	/*
+	 * If guest FPU not present, the FPU operation should have been
+	 * treated as a reserved instruction!
+	 * If FPU already in use, we shouldn't get this at all.
+	 */
+	if (WARN_ON(!_kvm_guest_has_fpu(&vcpu->arch) ||
+				vcpu->arch.aux_inuse & KVM_LARCH_FPU)) {
+		kvm_err("%s internal error\n", __func__);
+		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+		return RESUME_HOST;
+	}
+
+	kvm_own_fpu(vcpu);
+	return RESUME_GUEST;
+}