From 52ec4b695dbe0552bb994c4149e9122610a76668 Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Wed, 7 Dec 2022 09:17:43 +0530 Subject: [PATCH] RISC-V: KVM: Save mvendorid, marchid, and mimpid when creating VCPU We should save VCPU mvendorid, marchid, and mimpid at the time of creating VCPU so that we don't have to do host SBI call every time Guest/VM ask for these details. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Andrew Jones Signed-off-by: Anup Patel --- arch/riscv/include/asm/kvm_host.h | 5 +++++ arch/riscv/kvm/vcpu.c | 6 ++++++ arch/riscv/kvm/vcpu_sbi_base.c | 11 +++++------ 3 files changed, 16 insertions(+), 6 deletions(-) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 91c74b09a9709..93f43a3e78865 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -165,6 +165,11 @@ struct kvm_vcpu_arch { /* ISA feature bits (similar to MISA) */ DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX); + /* Vendor, Arch, and Implementation details */ + unsigned long mvendorid; + unsigned long marchid; + unsigned long mimpid; + /* SSCRATCH, STVEC, and SCOUNTEREN of Host */ unsigned long host_sscratch; unsigned long host_stvec; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 68c86f632d370..312a8a9268677 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -21,6 +21,7 @@ #include #include #include +#include const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { KVM_GENERIC_VCPU_STATS(), @@ -171,6 +172,11 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) set_bit(host_isa, vcpu->arch.isa); } + /* Setup vendor, arch, and implementation details */ + vcpu->arch.mvendorid = sbi_get_mvendorid(); + vcpu->arch.marchid = sbi_get_marchid(); + vcpu->arch.mimpid = sbi_get_mimpid(); + /* Setup VCPU hfence queue */ spin_lock_init(&vcpu->arch.hfence_lock); diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c index 0c806f61c629d..5d65c634d3012 100644 --- a/arch/riscv/kvm/vcpu_sbi_base.c +++ b/arch/riscv/kvm/vcpu_sbi_base.c @@ -19,7 +19,6 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, { int ret = 0; struct kvm_cpu_context *cp = &vcpu->arch.guest_context; - struct sbiret ecall_ret; switch (cp->a6) { case SBI_EXT_BASE_GET_SPEC_VERSION: @@ -48,13 +47,13 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, *out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0; break; case SBI_EXT_BASE_GET_MVENDORID: + *out_val = vcpu->arch.mvendorid; + break; case SBI_EXT_BASE_GET_MARCHID: + *out_val = vcpu->arch.marchid; + break; case SBI_EXT_BASE_GET_MIMPID: - ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0); - if (!ecall_ret.error) - *out_val = ecall_ret.value; - /*TODO: We are unnecessarily converting the error twice */ - ret = sbi_err_map_linux_errno(ecall_ret.error); + *out_val = vcpu->arch.mimpid; break; default: ret = -EOPNOTSUPP; -- 2.30.2