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Date: Tue, 1 Feb 2022 13:52:24 +0530 From: Anup Patel <apatel@...tanamicro.com> To: Paolo Bonzini <pbonzini@...hat.com>, Atish Patra <atishp@...shpatra.org> Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>, Alistair Francis <Alistair.Francis@....com>, Anup Patel <anup@...infault.org>, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Anup Patel <apatel@...tanamicro.com> Subject: [PATCH 3/6] RISC-V: KVM: Implement SBI v0.3 SRST extension The SBI v0.3 specification defines SRST (System Reset) extension which provides a standard poweroff and reboot interface. This patch implements SRST extension for the KVM Guest. Signed-off-by: Anup Patel <apatel@...tanamicro.com> --- arch/riscv/kvm/vcpu_sbi.c | 2 ++ arch/riscv/kvm/vcpu_sbi_replace.c | 44 +++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 11ae4f621f0d..a09ecb97b890 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -45,6 +45,7 @@ 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; +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; @@ -55,6 +56,7 @@ static const struct kvm_vcpu_sbi_extension *sbi_ext[] = { &vcpu_sbi_ext_time, &vcpu_sbi_ext_ipi, &vcpu_sbi_ext_rfence, + &vcpu_sbi_ext_srst, &vcpu_sbi_ext_hsm, &vcpu_sbi_ext_experimental, &vcpu_sbi_ext_vendor, diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c index 1bc0608a5bfd..0f217365c287 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -130,3 +130,47 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence = { .extid_end = SBI_EXT_RFENCE, .handler = kvm_sbi_ext_rfence_handler, }; + +static int kvm_sbi_ext_srst_handler(struct kvm_vcpu *vcpu, + struct kvm_run *run, + unsigned long *out_val, + struct kvm_cpu_trap *utrap, bool *exit) +{ + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; + unsigned long funcid = cp->a6; + u32 reason = cp->a1; + u32 type = cp->a0; + int ret = 0; + + switch (funcid) { + case SBI_EXT_SRST_RESET: + switch (type) { + case SBI_SRST_RESET_TYPE_SHUTDOWN: + kvm_riscv_vcpu_sbi_system_reset(vcpu, run, + KVM_SYSTEM_EVENT_SHUTDOWN, + reason); + *exit = true; + break; + case SBI_SRST_RESET_TYPE_COLD_REBOOT: + case SBI_SRST_RESET_TYPE_WARM_REBOOT: + kvm_riscv_vcpu_sbi_system_reset(vcpu, run, + KVM_SYSTEM_EVENT_RESET, + reason); + *exit = true; + break; + default: + ret = -EOPNOTSUPP; + } + break; + default: + ret = -EOPNOTSUPP; + } + + return ret; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst = { + .extid_start = SBI_EXT_SRST, + .extid_end = SBI_EXT_SRST, + .handler = kvm_sbi_ext_srst_handler, +}; -- 2.25.1
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