linux-kernel - [PATCH v5 03/30] LoongArch: KVM: Implement kvm hardware enable, disable interface

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Date:   Fri,  7 Apr 2023 09:59:36 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, 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 v5 03/30] LoongArch: KVM: Implement kvm hardware enable, disable interface

Implement kvm hardware enable, disable interface, setting
the guest config register to enable virtualization features
when called the interface.

Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
 arch/loongarch/kvm/main.c | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index 59b93512c..dca6ae878 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -189,6 +189,69 @@ static void _kvm_init_gcsr_flag(void)
 	set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR3);
 }
 
+void kvm_init_vmcs(struct kvm *kvm)
+{
+	kvm->arch.vmcs = vmcs;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+			unsigned int ioctl, unsigned long arg)
+{
+	return -ENOIOCTLCMD;
+}
+
+#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
+int kvm_arch_hardware_enable(void)
+{
+	unsigned long gcfg = 0;
+
+	/* First init gtlbc, gcfg, gstat, gintc. All guest use the same config */
+	clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+	write_csr_gcfg(0);
+	write_csr_gstat(0);
+	write_csr_gintc(0);
+
+	/*
+	 * Enable virtualization features granting guest direct control of
+	 * certain features:
+	 * GCI=2:       Trap on init or unimplement cache instruction.
+	 * TORU=0:      Trap on Root Unimplement.
+	 * CACTRL=1:    Root control cache.
+	 * TOP=0:       Trap on Previlege.
+	 * TOE=0:       Trap on Exception.
+	 * TIT=0:       Trap on Timer.
+	 */
+	if (cpu_has_gcip_all)
+		gcfg |= CSR_GCFG_GCI_SECURE;
+	if (cpu_has_matc_root)
+		gcfg |= CSR_GCFG_MATC_ROOT;
+
+	gcfg |= CSR_GCFG_TIT;
+	write_csr_gcfg(gcfg);
+
+	kvm_flush_tlb_all();
+
+	/* Enable using TGID  */
+	set_csr_gtlbc(CSR_GTLBC_USETGID);
+	kvm_debug("gtlbc:%llx gintc:%llx gstat:%llx gcfg:%llx",
+			read_csr_gtlbc(), read_csr_gintc(),
+			read_csr_gstat(), read_csr_gcfg());
+
+	return 0;
+}
+
+void kvm_arch_hardware_disable(void)
+{
+	clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+	write_csr_gcfg(0);
+	write_csr_gstat(0);
+	write_csr_gintc(0);
+
+	/* Flush any remaining guest TLB entries */
+	kvm_flush_tlb_all();
+}
+#endif
+
 static int kvm_loongarch_env_init(void)
 {
 	struct kvm_context *context;
-- 
2.31.1