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[v18,25/30] LoongArch: KVM: Implement handle fpu exception

Message ID	20230803022138.2736430-26-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: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini <pbonzini@redhat.com>, Huacai Chen <chenhuacai@kernel.org>, WANG Xuerui <kernel@xen0n.name>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, loongarch@lists.linux.dev, 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>, zhaotianrui@loongson.cn Subject: [PATCH v18 25/30] LoongArch: KVM: Implement handle fpu exception Date: Thu, 3 Aug 2023 10:21:33 +0800 Message-Id: <20230803022138.2736430-26-zhaotianrui@loongson.cn> In-Reply-To: <20230803022138.2736430-1-zhaotianrui@loongson.cn> References: <20230803022138.2736430-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add KVM LoongArch support \| [v18,00/30] Add KVM LoongArch support [v18,01/30] LoongArch: KVM: Add kvm related header files [v18,02/30] LoongArch: KVM: Implement kvm module related interface [v18,03/30] LoongArch: KVM: Implement kvm hardware enable, disable interface [v18,04/30] LoongArch: KVM: Implement VM related functions [v18,05/30] LoongArch: KVM: Add vcpu related header files [v18,06/30] LoongArch: KVM: Implement vcpu create and destroy interface [v18,07/30] LoongArch: KVM: Implement vcpu run interface [v18,08/30] LoongArch: KVM: Implement vcpu handle exit interface [v18,09/30] LoongArch: KVM: Implement vcpu get, vcpu set registers [v18,10/30] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface [v18,11/30] LoongArch: KVM: Implement fpu related operations for vcpu [v18,12/30] LoongArch: KVM: Implement vcpu interrupt operations [v18,13/30] LoongArch: KVM: Implement misc vcpu related interfaces [v18,14/30] LoongArch: KVM: Implement vcpu load and vcpu put operations [v18,15/30] LoongArch: KVM: Implement vcpu status description [v18,16/30] LoongArch: KVM: Implement update VM id function [v18,17/30] LoongArch: KVM: Implement virtual machine tlb operations [v18,18/30] LoongArch: KVM: Implement vcpu timer operations [v18,19/30] LoongArch: KVM: Implement kvm mmu operations [v18,20/30] LoongArch: KVM: Implement handle csr excption [v18,21/30] LoongArch: KVM: Implement handle iocsr exception [v18,22/30] LoongArch: KVM: Implement handle idle exception [v18,23/30] LoongArch: KVM: Implement handle gspr exception [v18,24/30] LoongArch: KVM: Implement handle mmio exception [v18,25/30] LoongArch: KVM: Implement handle fpu exception [v18,26/30] LoongArch: KVM: Implement kvm exception vector [v18,27/30] LoongArch: KVM: Implement vcpu world switch [v18,28/30] LoongArch: KVM: Enable kvm config and add the makefile [v18,29/30] LoongArch: KVM: Supplement kvm document about LoongArch-specific part [v18,30/30] LoongArch: KVM: Add maintainers for LoongArch KVM

Commit Message

zhaotianrui Aug. 3, 2023, 2:21 a.m. UTC

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

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/exit.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

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Patch

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 36a838607218..17e94ecec140 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -631,3 +631,29 @@  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(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;
+}