| Message ID | 20230910082911.3378782-17-guoren@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | riscv: Add Native/Paravirt qspinlock support | expand |
On Sun, Sep 10, 2023 at 04:29:10AM -0400, guoren@kernel.org wrote: > From: Guo Ren <guoren@linux.alibaba.com> > > Add the files functions needed to support the SBI PVLOCK (paravirt > qspinlock kick_cpu) extension. This is a preparation for the next > core implementation of kick_cpu. > > Signed-off-by: Guo Ren <guoren@linux.alibaba.com> > Signed-off-by: Guo Ren <guoren@kernel.org> > --- > arch/riscv/include/asm/kvm_vcpu_sbi.h | 1 + > arch/riscv/include/uapi/asm/kvm.h | 1 + > arch/riscv/kvm/Makefile | 1 + > arch/riscv/kvm/vcpu_sbi.c | 4 +++ > arch/riscv/kvm/vcpu_sbi_pvlock.c | 38 +++++++++++++++++++++++++++ > 5 files changed, 45 insertions(+) > create mode 100644 arch/riscv/kvm/vcpu_sbi_pvlock.c > > diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h > index cdcf0ff07be7..7b4d60b54d7e 100644 > --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h > +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h > @@ -71,6 +71,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst; > extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm; > extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental; > extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor; > +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pvlock; > > #ifdef CONFIG_RISCV_PMU_SBI > extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pmu; > diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h > index 992c5e407104..d005c229f2da 100644 > --- a/arch/riscv/include/uapi/asm/kvm.h > +++ b/arch/riscv/include/uapi/asm/kvm.h > @@ -148,6 +148,7 @@ enum KVM_RISCV_SBI_EXT_ID { > KVM_RISCV_SBI_EXT_PMU, > KVM_RISCV_SBI_EXT_EXPERIMENTAL, > KVM_RISCV_SBI_EXT_VENDOR, > + KVM_RISCV_SBI_EXT_PVLOCK, > KVM_RISCV_SBI_EXT_MAX, > }; > > diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile > index 4c2067fc59fc..6112750a3a0c 100644 > --- a/arch/riscv/kvm/Makefile > +++ b/arch/riscv/kvm/Makefile > @@ -26,6 +26,7 @@ kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o > kvm-y += vcpu_sbi_base.o > kvm-y += vcpu_sbi_replace.o > kvm-y += vcpu_sbi_hsm.o > +kvm-y += vcpu_sbi_pvlock.o > kvm-y += vcpu_timer.o > kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o > kvm-y += aia.o > diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c > index 9cd97091c723..c03c3d489b2b 100644 > --- a/arch/riscv/kvm/vcpu_sbi.c > +++ b/arch/riscv/kvm/vcpu_sbi.c > @@ -74,6 +74,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = { > .ext_idx = KVM_RISCV_SBI_EXT_VENDOR, > .ext_ptr = &vcpu_sbi_ext_vendor, > }, > + { > + .ext_idx = KVM_RISCV_SBI_EXT_PVLOCK, > + .ext_ptr = &vcpu_sbi_ext_pvlock, > + }, > }; > > void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run) > diff --git a/arch/riscv/kvm/vcpu_sbi_pvlock.c b/arch/riscv/kvm/vcpu_sbi_pvlock.c > new file mode 100644 > index 000000000000..544a456c5041 > --- /dev/null > +++ b/arch/riscv/kvm/vcpu_sbi_pvlock.c > @@ -0,0 +1,38 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c), 2023 Alibaba Cloud > + * > + * Authors: > + * Guo Ren <guoren@linux.alibaba.com> > + */ > + > +#include <linux/errno.h> > +#include <linux/err.h> > +#include <linux/kvm_host.h> > +#include <asm/sbi.h> > +#include <asm/kvm_vcpu_sbi.h> > + > +static int kvm_sbi_ext_pvlock_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, > + struct kvm_vcpu_sbi_return *retdata) > +{ > + int ret = 0; > + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; > + unsigned long funcid = cp->a6; > + > + switch (funcid) { > + case SBI_EXT_PVLOCK_KICK_CPU: > + break; IIUC, the kick implementation comes in the next patch but here it becomes a no-op. Is there any chance this may break a future bisect? I don't understand a lot, but I would suggest either removing this no-op case SBI_EXT_PVLOCK_KICK_CPU, or merging this patch with the next one. Other than that, LGTM. Thanks, Leo > + default: > + ret = SBI_ERR_NOT_SUPPORTED; > + } > + > + retdata->err_val = ret; > + > + return 0; > +} > + > +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pvlock = { > + .extid_start = SBI_EXT_PVLOCK, > + .extid_end = SBI_EXT_PVLOCK, > + .handler = kvm_sbi_ext_pvlock_handler, > +}; > -- > 2.36.1 >
diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h index cdcf0ff07be7..7b4d60b54d7e 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -71,6 +71,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor; +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pvlock; #ifdef CONFIG_RISCV_PMU_SBI extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pmu; diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h index 992c5e407104..d005c229f2da 100644 --- a/arch/riscv/include/uapi/asm/kvm.h +++ b/arch/riscv/include/uapi/asm/kvm.h @@ -148,6 +148,7 @@ enum KVM_RISCV_SBI_EXT_ID { KVM_RISCV_SBI_EXT_PMU, KVM_RISCV_SBI_EXT_EXPERIMENTAL, KVM_RISCV_SBI_EXT_VENDOR, + KVM_RISCV_SBI_EXT_PVLOCK, KVM_RISCV_SBI_EXT_MAX, }; diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile index 4c2067fc59fc..6112750a3a0c 100644 --- a/arch/riscv/kvm/Makefile +++ b/arch/riscv/kvm/Makefile @@ -26,6 +26,7 @@ kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o kvm-y += vcpu_sbi_base.o kvm-y += vcpu_sbi_replace.o kvm-y += vcpu_sbi_hsm.o +kvm-y += vcpu_sbi_pvlock.o kvm-y += vcpu_timer.o kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o kvm-y += aia.o diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 9cd97091c723..c03c3d489b2b 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -74,6 +74,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = { .ext_idx = KVM_RISCV_SBI_EXT_VENDOR, .ext_ptr = &vcpu_sbi_ext_vendor, }, + { + .ext_idx = KVM_RISCV_SBI_EXT_PVLOCK, + .ext_ptr = &vcpu_sbi_ext_pvlock, + }, }; void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run) diff --git a/arch/riscv/kvm/vcpu_sbi_pvlock.c b/arch/riscv/kvm/vcpu_sbi_pvlock.c new file mode 100644 index 000000000000..544a456c5041 --- /dev/null +++ b/arch/riscv/kvm/vcpu_sbi_pvlock.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c), 2023 Alibaba Cloud + * + * Authors: + * Guo Ren <guoren@linux.alibaba.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <asm/sbi.h> +#include <asm/kvm_vcpu_sbi.h> + +static int kvm_sbi_ext_pvlock_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, + struct kvm_vcpu_sbi_return *retdata) +{ + int ret = 0; + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; + unsigned long funcid = cp->a6; + + switch (funcid) { + case SBI_EXT_PVLOCK_KICK_CPU: + break; + default: + ret = SBI_ERR_NOT_SUPPORTED; + } + + retdata->err_val = ret; + + return 0; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pvlock = { + .extid_start = SBI_EXT_PVLOCK, + .extid_end = SBI_EXT_PVLOCK, + .handler = kvm_sbi_ext_pvlock_handler, +};