On Mon, Apr 12, 2021 at 12:24 PM Yifei Jiang <jiangyifei@xxxxxxxxxx> wrote:
>
> Only support supervisor external interrupt currently.
>
> Signed-off-by: Yifei Jiang <jiangyifei@xxxxxxxxxx>
> Signed-off-by: Yipeng Yin <yinyipeng1@xxxxxxxxxx>
> ---
> hw/intc/sifive_plic.c | 29 ++++++++++++++++++++---------
> target/riscv/kvm-stub.c | 5 +++++
> target/riscv/kvm.c | 20 ++++++++++++++++++++
> target/riscv/kvm_riscv.h | 1 +
> 4 files changed, 46 insertions(+), 9 deletions(-)
>
> diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c
> index 97a1a27a9a..2746eb7a05 100644
> --- a/hw/intc/sifive_plic.c
> +++ b/hw/intc/sifive_plic.c
> @@ -31,6 +31,8 @@
> #include "target/riscv/cpu.h"
> #include "sysemu/sysemu.h"
> #include "migration/vmstate.h"
> +#include "sysemu/kvm.h"
> +#include "kvm_riscv.h"
>
> #define RISCV_DEBUG_PLIC 0
>
> @@ -147,15 +149,24 @@ static void sifive_plic_update(SiFivePLICState *plic)
> continue;
> }
> int level = sifive_plic_irqs_pending(plic, addrid);
> - switch (mode) {
> - case PLICMode_M:
> - riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_MEIP, BOOL_TO_MASK(level));
> - break;
> - case PLICMode_S:
> - riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_SEIP, BOOL_TO_MASK(level));
> - break;
> - default:
> - break;
> + if (kvm_enabled()) {
> + if (mode == PLICMode_M) {
> + continue;
> + }
> + kvm_riscv_set_irq(RISCV_CPU(cpu), IRQ_S_EXT, level);
> + } else {
> + switch (mode) {
> + case PLICMode_M:
> + riscv_cpu_update_mip(RISCV_CPU(cpu),
> + MIP_MEIP, BOOL_TO_MASK(level));
> + break;
> + case PLICMode_S:
> + riscv_cpu_update_mip(RISCV_CPU(cpu),
> + MIP_SEIP, BOOL_TO_MASK(level));
> + break;
> + default:
> + break;
> + }
I am not comfortable with this patch.
This way we will endup calling kvm_riscv_set_irq() from various
places in hw/intc and hw/riscv.
I suggest to extend riscv_cpu_update_mip() such that when kvm is
enabled riscv_cpu_update_mip() will:
1) Consider only MIP_SEIP bit in "mask" parameter and all other
bits in "mask" parameter will be ignored probably with warning
2) When the MIP_SEIP bit is set in "mask" call kvm_riscv_set_irq()
to change the IRQ state in the KVM module.
Regards,
Anup
> }
> }
>
> diff --git a/target/riscv/kvm-stub.c b/target/riscv/kvm-stub.c
> index 39b96fe3f4..4e8fc31a21 100644
> --- a/target/riscv/kvm-stub.c
> +++ b/target/riscv/kvm-stub.c
> @@ -23,3 +23,8 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> {
> abort();
> }
> +
> +void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> +{
> + abort();
> +}
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 79c931acb4..da63535812 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -453,6 +453,26 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> env->gpr[11] = cpu->env.fdt_addr; /* a1 */
> }
>
> +void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
> +{
> + int ret;
> + unsigned virq = level ? KVM_INTERRUPT_SET : KVM_INTERRUPT_UNSET;
> +
> + if (irq != IRQ_S_EXT) {
> + return;
> + }
> +
> + if (!kvm_enabled()) {
> + return;
> + }
> +
> + ret = kvm_vcpu_ioctl(CPU(cpu), KVM_INTERRUPT, &virq);
> + if (ret < 0) {
> + perror("Set irq failed");
> + abort();
> + }
> +}
> +
> bool kvm_arch_cpu_check_are_resettable(void)
> {
> return true;
> diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
> index f38c82bf59..ed281bdce0 100644
> --- a/target/riscv/kvm_riscv.h
> +++ b/target/riscv/kvm_riscv.h
> @@ -20,5 +20,6 @@
> #define QEMU_KVM_RISCV_H
>
> void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
> +void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
>
> #endif
> --
> 2.19.1
>
>
> --
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> kvm-riscv@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/kvm-riscv
