[v7] Add KVM LoongArch support

[PATCH v7 17/30] LoongArch: KVM: Implement virtual machine tlb operations

Posted by Tianrui Zhao 2 years, 8 months ago

Implement loongarch virtual machine tlb operations such as flush tlb by
specific gpa parameter and flush all of the virt machines tlb.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/tlb.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 arch/loongarch/kvm/tlb.c

diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
new file mode 100644
index 000000000000..66e116cf2486
--- /dev/null
+++ b/arch/loongarch/kvm/tlb.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/tlb.h>
+
+int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
+{
+	preempt_disable();
+	gpa &= (PAGE_MASK << 1);
+	invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
+	preempt_enable();
+	return 0;
+}
+
+/**
+ * kvm_flush_tlb_all() - Flush all root TLB entries for
+ * guests.
+ *
+ * Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
+ */
+void kvm_flush_tlb_all(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	invtlb_all(INVTLB_ALLGID, 0, 0);
+	local_irq_restore(flags);
+}
-- 
2.31.1

Re: [PATCH v7 17/30] LoongArch: KVM: Implement virtual machine tlb operations

Posted by Huacai Chen 2 years, 8 months ago

Hi, Tianrui,

On Mon, Apr 17, 2023 at 5:47 PM Tianrui Zhao <zhaotianrui@loongson.cn> wrote:
>
> Implement loongarch virtual machine tlb operations such as flush tlb by
> specific gpa parameter and flush all of the virt machines tlb.
Use LoongArch instead of loongarch in commit messages and comments, please.

Huacai
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
> ---
>  arch/loongarch/kvm/tlb.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 arch/loongarch/kvm/tlb.c
>
> diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
> new file mode 100644
> index 000000000000..66e116cf2486
> --- /dev/null
> +++ b/arch/loongarch/kvm/tlb.c
> @@ -0,0 +1,31 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/kvm_host.h>
> +#include <asm/tlb.h>
> +
> +int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
> +{
> +       preempt_disable();
> +       gpa &= (PAGE_MASK << 1);
> +       invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
> +       preempt_enable();
> +       return 0;
> +}
> +
> +/**
> + * kvm_flush_tlb_all() - Flush all root TLB entries for
> + * guests.
> + *
> + * Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
> + */
> +void kvm_flush_tlb_all(void)
> +{
> +       unsigned long flags;
> +
> +       local_irq_save(flags);
> +       invtlb_all(INVTLB_ALLGID, 0, 0);
> +       local_irq_restore(flags);
> +}
> --
> 2.31.1
>

Re: [PATCH v7 17/30] LoongArch: KVM: Implement virtual machine tlb operations

Posted by Tianrui Zhao 2 years, 8 months ago


在 2023年04月19日 10:02, Huacai Chen 写道:
> Hi, Tianrui,
>
> On Mon, Apr 17, 2023 at 5:47 PM Tianrui Zhao <zhaotianrui@loongson.cn> wrote:
>> Implement loongarch virtual machine tlb operations such as flush tlb by
>> specific gpa parameter and flush all of the virt machines tlb.
> Use LoongArch instead of loongarch in commit messages and comments, please.
>
> Huacai
Ok, I will replace loongarch with LoongArch, thanks.

Thanks
Tianrui Zhao
>> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
>> ---
>>   arch/loongarch/kvm/tlb.c | 31 +++++++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>   create mode 100644 arch/loongarch/kvm/tlb.c
>>
>> diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
>> new file mode 100644
>> index 000000000000..66e116cf2486
>> --- /dev/null
>> +++ b/arch/loongarch/kvm/tlb.c
>> @@ -0,0 +1,31 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
>> + */
>> +
>> +#include <linux/kvm_host.h>
>> +#include <asm/tlb.h>
>> +
>> +int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
>> +{
>> +       preempt_disable();
>> +       gpa &= (PAGE_MASK << 1);
>> +       invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
>> +       preempt_enable();
>> +       return 0;
>> +}
>> +
>> +/**
>> + * kvm_flush_tlb_all() - Flush all root TLB entries for
>> + * guests.
>> + *
>> + * Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
>> + */
>> +void kvm_flush_tlb_all(void)
>> +{
>> +       unsigned long flags;
>> +
>> +       local_irq_save(flags);
>> +       invtlb_all(INVTLB_ALLGID, 0, 0);
>> +       local_irq_restore(flags);
>> +}
>> --
>> 2.31.1
>>