diff mbox series

[v4,4/5] RISC-V: KVM: Add v0.1 replacement SBI extensions defined in v02

Message ID 20211105235852.3011900-5-atish.patra@wdc.com (mailing list archive)
State New, archived
Headers show
Series Add SBI v0.2 support for KVM | expand

Commit Message

Atish Patra Nov. 5, 2021, 11:58 p.m. UTC 
The SBI v0.2 contains some of the improved versions of required v0.1
extensions such as remote fence, timer and IPI.

This patch implements those extensions.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/kvm/Makefile           |   1 +
 arch/riscv/kvm/vcpu_sbi.c         |   7 ++
 arch/riscv/kvm/vcpu_sbi_replace.c | 136 ++++++++++++++++++++++++++++++
 3 files changed, 144 insertions(+)
 create mode 100644 arch/riscv/kvm/vcpu_sbi_replace.c

Comments

Anup Patel Nov. 6, 2021, 4:46 a.m. UTC | #1 
On Sat, Nov 6, 2021 at 5:29 AM Atish Patra <atish.patra@wdc.com> wrote:
>
> The SBI v0.2 contains some of the improved versions of required v0.1
> extensions such as remote fence, timer and IPI.
>
> This patch implements those extensions.
>
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> ---
>  arch/riscv/kvm/Makefile           |   1 +
>  arch/riscv/kvm/vcpu_sbi.c         |   7 ++
>  arch/riscv/kvm/vcpu_sbi_replace.c | 136 ++++++++++++++++++++++++++++++
>  3 files changed, 144 insertions(+)
>  create mode 100644 arch/riscv/kvm/vcpu_sbi_replace.c
>
> diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
> index 84c02922a329..4757ae158bf3 100644
> --- a/arch/riscv/kvm/Makefile
> +++ b/arch/riscv/kvm/Makefile
> @@ -25,4 +25,5 @@ kvm-y += vcpu_switch.o
>  kvm-y += vcpu_sbi.o
>  kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
>  kvm-y += vcpu_sbi_base.o
> +kvm-y += vcpu_sbi_replace.o
>  kvm-y += vcpu_timer.o
> diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
> index 92b682f4f29e..3502c6166eba 100644
> --- a/arch/riscv/kvm/vcpu_sbi.c
> +++ b/arch/riscv/kvm/vcpu_sbi.c
> @@ -40,9 +40,16 @@ static const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
>  };
>  #endif
>  extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
> +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time;
> +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi;
> +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence;
> +
>  static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
>         &vcpu_sbi_ext_v01,
>         &vcpu_sbi_ext_base,
> +       &vcpu_sbi_ext_time,
> +       &vcpu_sbi_ext_ipi,
> +       &vcpu_sbi_ext_rfence,
>  };
>
>  void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
> diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c
> new file mode 100644
> index 000000000000..a80fa7691b14
> --- /dev/null
> +++ b/arch/riscv/kvm/vcpu_sbi_replace.c
> @@ -0,0 +1,136 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2021 Western Digital Corporation or its affiliates.
> + *
> + * Authors:
> + *     Atish Patra <atish.patra@wdc.com>
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/err.h>
> +#include <linux/kvm_host.h>
> +#include <asm/csr.h>
> +#include <asm/sbi.h>
> +#include <asm/kvm_vcpu_timer.h>
> +#include <asm/kvm_vcpu_sbi.h>
> +
> +static int kvm_sbi_ext_time_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> +                                   unsigned long *out_val,
> +                                   struct kvm_cpu_trap *utrap, bool *exit)
> +{
> +       int ret = 0;
> +       struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
> +       u64 next_cycle;
> +
> +       if (!cp || (cp->a6 != SBI_EXT_TIME_SET_TIMER))
> +               return -EINVAL;
> +
> +#if __riscv_xlen == 32
> +       next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
> +#else
> +       next_cycle = (u64)cp->a0;
> +#endif
> +       kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
> +
> +       return ret;
> +}
> +
> +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time = {
> +       .extid_start = SBI_EXT_TIME,
> +       .extid_end = SBI_EXT_TIME,
> +       .handler = kvm_sbi_ext_time_handler,
> +};
> +
> +static int kvm_sbi_ext_ipi_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> +                                  unsigned long *out_val,
> +                                  struct kvm_cpu_trap *utrap, bool *exit)
> +{
> +       int i, ret = 0;
> +       struct kvm_vcpu *tmp;
> +       struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
> +       unsigned long hmask = cp->a0;
> +       unsigned long hbase = cp->a1;
> +
> +       if (!cp || (cp->a6 != SBI_EXT_IPI_SEND_IPI))
> +               return -EINVAL;
> +
> +       kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
> +               if (hbase != -1UL) {
> +                       if (tmp->vcpu_id < hbase)
> +                               continue;
> +                       if (!(hmask & (1UL << (tmp->vcpu_id - hbase))))
> +                               continue;
> +               }
> +               ret = kvm_riscv_vcpu_set_interrupt(tmp, IRQ_VS_SOFT);
> +               if (ret < 0)
> +                       break;
> +       }
> +
> +       return ret;
> +}
> +
> +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi = {
> +       .extid_start = SBI_EXT_IPI,
> +       .extid_end = SBI_EXT_IPI,
> +       .handler = kvm_sbi_ext_ipi_handler,
> +};
> +
> +static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> +                                     unsigned long *out_val,
> +                                     struct kvm_cpu_trap *utrap, bool *exit)
> +{
> +       int i, ret = 0;
> +       struct cpumask cm, hm;
> +       struct kvm_vcpu *tmp;
> +       struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
> +       unsigned long hmask = cp->a0;
> +       unsigned long hbase = cp->a1;
> +       unsigned long funcid = cp->a6;
> +
> +       if (!cp)
> +               return -EINVAL;
> +
> +       cpumask_clear(&cm);
> +       cpumask_clear(&hm);
> +       kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
> +               if (hbase != -1UL) {
> +                       if (tmp->vcpu_id < hbase)
> +                               continue;
> +                       if (!(hmask & (1UL << (tmp->vcpu_id - hbase))))
> +                               continue;
> +               }
> +               if (tmp->cpu < 0)
> +                       continue;
> +               cpumask_set_cpu(tmp->cpu, &cm);
> +       }
> +
> +       riscv_cpuid_to_hartid_mask(&cm, &hm);
> +
> +       switch (funcid) {
> +       case SBI_EXT_RFENCE_REMOTE_FENCE_I:
> +               ret = sbi_remote_fence_i(cpumask_bits(&hm));
> +               break;
> +       case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
> +               ret = sbi_remote_hfence_vvma(cpumask_bits(&hm), cp->a2, cp->a3);
> +               break;
> +       case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
> +               ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm), cp->a2,
> +                                                 cp->a3, cp->a4);
> +               break;
> +       case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
> +       case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
> +       case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
> +       case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
> +       /* TODO: implement for nested hypervisor case */
> +       default:
> +               ret = -EOPNOTSUPP;
> +       }
> +
> +       return ret;
> +}
> +
> +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence = {
> +       .extid_start = SBI_EXT_RFENCE,
> +       .extid_end = SBI_EXT_RFENCE,
> +       .handler = kvm_sbi_ext_rfence_handler,
> +};
> --
> 2.31.1
>

Drop checks on "cp" pointer in various functions above.

Otherwise it looks good to me.

Reviewed-by: Anup Patel <anup.patel@wdc.com>

Regards,
Anup
diff mbox series

Patch

diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index 84c02922a329..4757ae158bf3 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -25,4 +25,5 @@  kvm-y += vcpu_switch.o
 kvm-y += vcpu_sbi.o
 kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
 kvm-y += vcpu_sbi_base.o
+kvm-y += vcpu_sbi_replace.o
 kvm-y += vcpu_timer.o
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index 92b682f4f29e..3502c6166eba 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -40,9 +40,16 @@  static const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
 };
 #endif
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time;
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi;
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence;
+
 static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
 	&vcpu_sbi_ext_v01,
 	&vcpu_sbi_ext_base,
+	&vcpu_sbi_ext_time,
+	&vcpu_sbi_ext_ipi,
+	&vcpu_sbi_ext_rfence,
 };
 
 void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c
new file mode 100644
index 000000000000..a80fa7691b14
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_replace.c
@@ -0,0 +1,136 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *     Atish Patra <atish.patra@wdc.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <asm/csr.h>
+#include <asm/sbi.h>
+#include <asm/kvm_vcpu_timer.h>
+#include <asm/kvm_vcpu_sbi.h>
+
+static int kvm_sbi_ext_time_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				    unsigned long *out_val,
+				    struct kvm_cpu_trap *utrap, bool *exit)
+{
+	int ret = 0;
+	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+	u64 next_cycle;
+
+	if (!cp || (cp->a6 != SBI_EXT_TIME_SET_TIMER))
+		return -EINVAL;
+
+#if __riscv_xlen == 32
+	next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
+#else
+	next_cycle = (u64)cp->a0;
+#endif
+	kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
+
+	return ret;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time = {
+	.extid_start = SBI_EXT_TIME,
+	.extid_end = SBI_EXT_TIME,
+	.handler = kvm_sbi_ext_time_handler,
+};
+
+static int kvm_sbi_ext_ipi_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				   unsigned long *out_val,
+				   struct kvm_cpu_trap *utrap, bool *exit)
+{
+	int i, ret = 0;
+	struct kvm_vcpu *tmp;
+	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+	unsigned long hmask = cp->a0;
+	unsigned long hbase = cp->a1;
+
+	if (!cp || (cp->a6 != SBI_EXT_IPI_SEND_IPI))
+		return -EINVAL;
+
+	kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
+		if (hbase != -1UL) {
+			if (tmp->vcpu_id < hbase)
+				continue;
+			if (!(hmask & (1UL << (tmp->vcpu_id - hbase))))
+				continue;
+		}
+		ret = kvm_riscv_vcpu_set_interrupt(tmp, IRQ_VS_SOFT);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi = {
+	.extid_start = SBI_EXT_IPI,
+	.extid_end = SBI_EXT_IPI,
+	.handler = kvm_sbi_ext_ipi_handler,
+};
+
+static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				      unsigned long *out_val,
+				      struct kvm_cpu_trap *utrap, bool *exit)
+{
+	int i, ret = 0;
+	struct cpumask cm, hm;
+	struct kvm_vcpu *tmp;
+	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+	unsigned long hmask = cp->a0;
+	unsigned long hbase = cp->a1;
+	unsigned long funcid = cp->a6;
+
+	if (!cp)
+		return -EINVAL;
+
+	cpumask_clear(&cm);
+	cpumask_clear(&hm);
+	kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
+		if (hbase != -1UL) {
+			if (tmp->vcpu_id < hbase)
+				continue;
+			if (!(hmask & (1UL << (tmp->vcpu_id - hbase))))
+				continue;
+		}
+		if (tmp->cpu < 0)
+			continue;
+		cpumask_set_cpu(tmp->cpu, &cm);
+	}
+
+	riscv_cpuid_to_hartid_mask(&cm, &hm);
+
+	switch (funcid) {
+	case SBI_EXT_RFENCE_REMOTE_FENCE_I:
+		ret = sbi_remote_fence_i(cpumask_bits(&hm));
+		break;
+	case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
+		ret = sbi_remote_hfence_vvma(cpumask_bits(&hm), cp->a2, cp->a3);
+		break;
+	case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
+		ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm), cp->a2,
+						  cp->a3, cp->a4);
+		break;
+	case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
+	case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
+	case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
+	case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
+	/* TODO: implement for nested hypervisor case */
+	default:
+		ret = -EOPNOTSUPP;
+	}
+
+	return ret;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence = {
+	.extid_start = SBI_EXT_RFENCE,
+	.extid_end = SBI_EXT_RFENCE,
+	.handler = kvm_sbi_ext_rfence_handler,
+};