From fe0bab701e3b71a1d2db123c05b4f5c33098cc96 Mon Sep 17 00:00:00 2001 From: Mayuresh Chitale Date: Wed, 13 Sep 2023 22:09:01 +0530 Subject: [PATCH] RISC-V: KVM: Add kvm_vcpu_config Add a placeholder for all registers such as henvcfg, hstateen etc which have 'static' configurations depending on extensions supported by the guest. The values are derived once and are then subsequently written to the corresponding CSRs while switching to the vcpu. Signed-off-by: Mayuresh Chitale Reviewed-by: Andrew Jones Signed-off-by: Anup Patel --- arch/riscv/include/asm/kvm_host.h | 7 +++++++ arch/riscv/kvm/vcpu.c | 27 ++++++++++++++------------- 2 files changed, 21 insertions(+), 13 deletions(-) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 1ebf20dfbaa69..4f787dce4da1c 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -164,6 +164,10 @@ struct kvm_vcpu_csr { unsigned long scounteren; }; +struct kvm_vcpu_config { + u64 henvcfg; +}; + struct kvm_vcpu_arch { /* VCPU ran at least once */ bool ran_atleast_once; @@ -244,6 +248,9 @@ struct kvm_vcpu_arch { /* Performance monitoring context */ struct kvm_pmu pmu_context; + + /* 'static' configurations which are set only once */ + struct kvm_vcpu_config cfg; }; static inline void kvm_arch_sync_events(struct kvm *kvm) {} diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 82229db1ce73f..c5eccc798e70c 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -471,31 +471,28 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, return -EINVAL; } -static void kvm_riscv_vcpu_update_config(const unsigned long *isa) +static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu) { - u64 henvcfg = 0; + const unsigned long *isa = vcpu->arch.isa; + struct kvm_vcpu_config *cfg = &vcpu->arch.cfg; if (riscv_isa_extension_available(isa, SVPBMT)) - henvcfg |= ENVCFG_PBMTE; + cfg->henvcfg |= ENVCFG_PBMTE; if (riscv_isa_extension_available(isa, SSTC)) - henvcfg |= ENVCFG_STCE; + cfg->henvcfg |= ENVCFG_STCE; if (riscv_isa_extension_available(isa, ZICBOM)) - henvcfg |= (ENVCFG_CBIE | ENVCFG_CBCFE); + cfg->henvcfg |= (ENVCFG_CBIE | ENVCFG_CBCFE); if (riscv_isa_extension_available(isa, ZICBOZ)) - henvcfg |= ENVCFG_CBZE; - - csr_write(CSR_HENVCFG, henvcfg); -#ifdef CONFIG_32BIT - csr_write(CSR_HENVCFGH, henvcfg >> 32); -#endif + cfg->henvcfg |= ENVCFG_CBZE; } void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr; + struct kvm_vcpu_config *cfg = &vcpu->arch.cfg; csr_write(CSR_VSSTATUS, csr->vsstatus); csr_write(CSR_VSIE, csr->vsie); @@ -506,8 +503,9 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) csr_write(CSR_VSTVAL, csr->vstval); csr_write(CSR_HVIP, csr->hvip); csr_write(CSR_VSATP, csr->vsatp); - - kvm_riscv_vcpu_update_config(vcpu->arch.isa); + csr_write(CSR_HENVCFG, cfg->henvcfg); + if (IS_ENABLED(CONFIG_32BIT)) + csr_write(CSR_HENVCFGH, cfg->henvcfg >> 32); kvm_riscv_gstage_update_hgatp(vcpu); @@ -627,6 +625,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) struct kvm_cpu_trap trap; struct kvm_run *run = vcpu->run; + if (!vcpu->arch.ran_atleast_once) + kvm_riscv_vcpu_setup_config(vcpu); + /* Mark this VCPU ran at least once */ vcpu->arch.ran_atleast_once = true;