| Message ID | 20220201082227.361967-6-apatel@ventanamicro.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM RISC-V SBI v0.3 support | expand |
On Tue, Feb 1, 2022 at 12:24 AM Anup Patel <apatel@ventanamicro.com> wrote: > > The wait for interrupt (WFI) instruction emulation can share the VCPU > halt logic with SBI HSM suspend emulation so this patch adds a common > kvm_riscv_vcpu_wfi() function for this purpose. > > Signed-off-by: Anup Patel <apatel@ventanamicro.com> > --- > arch/riscv/include/asm/kvm_host.h | 1 + > arch/riscv/kvm/vcpu_exit.c | 22 ++++++++++++++++------ > 2 files changed, 17 insertions(+), 6 deletions(-) > > diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h > index 99ef6a120617..78da839657e5 100644 > --- a/arch/riscv/include/asm/kvm_host.h > +++ b/arch/riscv/include/asm/kvm_host.h > @@ -228,6 +228,7 @@ void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu); > > void __kvm_riscv_unpriv_trap(void); > > +void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu); > unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, > bool read_insn, > unsigned long guest_addr, > diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c > index 571f319e995a..aa8af129e4bb 100644 > --- a/arch/riscv/kvm/vcpu_exit.c > +++ b/arch/riscv/kvm/vcpu_exit.c > @@ -144,12 +144,7 @@ static int system_opcode_insn(struct kvm_vcpu *vcpu, > { > if ((insn & INSN_MASK_WFI) == INSN_MATCH_WFI) { > vcpu->stat.wfi_exit_stat++; > - if (!kvm_arch_vcpu_runnable(vcpu)) { > - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx); > - kvm_vcpu_halt(vcpu); > - vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); > - kvm_clear_request(KVM_REQ_UNHALT, vcpu); > - } > + kvm_riscv_vcpu_wfi(vcpu); > vcpu->arch.guest_context.sepc += INSN_LEN(insn); > return 1; > } > @@ -453,6 +448,21 @@ static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run, > return 1; > } > > +/** > + * kvm_riscv_vcpu_wfi -- Emulate wait for interrupt (WFI) behaviour > + * > + * @vcpu: The VCPU pointer > + */ > +void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu) > +{ > + if (!kvm_arch_vcpu_runnable(vcpu)) { > + srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx); > + kvm_vcpu_halt(vcpu); > + vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); > + kvm_clear_request(KVM_REQ_UNHALT, vcpu); > + } > +} > + > /** > * kvm_riscv_vcpu_unpriv_read -- Read machine word from Guest memory > * > -- > 2.25.1 > Reviewed-by: Atish Patra <atishp@rivosinc.com> -- Regards, Atish
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 99ef6a120617..78da839657e5 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -228,6 +228,7 @@ void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu); void __kvm_riscv_unpriv_trap(void); +void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu); unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, bool read_insn, unsigned long guest_addr, diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index 571f319e995a..aa8af129e4bb 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -144,12 +144,7 @@ static int system_opcode_insn(struct kvm_vcpu *vcpu, { if ((insn & INSN_MASK_WFI) == INSN_MATCH_WFI) { vcpu->stat.wfi_exit_stat++; - if (!kvm_arch_vcpu_runnable(vcpu)) { - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx); - kvm_vcpu_halt(vcpu); - vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); - kvm_clear_request(KVM_REQ_UNHALT, vcpu); - } + kvm_riscv_vcpu_wfi(vcpu); vcpu->arch.guest_context.sepc += INSN_LEN(insn); return 1; } @@ -453,6 +448,21 @@ static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run, return 1; } +/** + * kvm_riscv_vcpu_wfi -- Emulate wait for interrupt (WFI) behaviour + * + * @vcpu: The VCPU pointer + */ +void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu) +{ + if (!kvm_arch_vcpu_runnable(vcpu)) { + srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx); + kvm_vcpu_halt(vcpu); + vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + kvm_clear_request(KVM_REQ_UNHALT, vcpu); + } +} + /** * kvm_riscv_vcpu_unpriv_read -- Read machine word from Guest memory *
The wait for interrupt (WFI) instruction emulation can share the VCPU halt logic with SBI HSM suspend emulation so this patch adds a common kvm_riscv_vcpu_wfi() function for this purpose. Signed-off-by: Anup Patel <apatel@ventanamicro.com> --- arch/riscv/include/asm/kvm_host.h | 1 + arch/riscv/kvm/vcpu_exit.c | 22 ++++++++++++++++------ 2 files changed, 17 insertions(+), 6 deletions(-)