| Message ID | 20240214122141.305126-5-apatel@ventanamicro.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | More ISA extensions | expand |
On Wed, Feb 14, 2024 at 05:51:35PM +0530, Anup Patel wrote: > When the scalar extensions are available expose them to the guest > via device tree so that guest can use it. This includes extensions > Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zkr, Zksed, Zksh, and Zkt. > > The Zkr extension requires SEED CSR emulation in user space so > we also add related KVM_EXIT_RISCV_CSR handling. > > Signed-off-by: Anup Patel <apatel@ventanamicro.com> > --- > riscv/fdt.c | 10 ++++++++++ > riscv/include/kvm/csr.h | 15 ++++++++++++++ > riscv/include/kvm/kvm-config-arch.h | 30 ++++++++++++++++++++++++++++ > riscv/kvm-cpu.c | 31 +++++++++++++++++++++++++++++ > 4 files changed, 86 insertions(+) > create mode 100644 riscv/include/kvm/csr.h > > diff --git a/riscv/fdt.c b/riscv/fdt.c > index 84b6087..be87e9a 100644 > --- a/riscv/fdt.c > +++ b/riscv/fdt.c > @@ -25,6 +25,9 @@ struct isa_ext_info isa_info_arr[] = { > {"zba", KVM_RISCV_ISA_EXT_ZBA}, > {"zbb", KVM_RISCV_ISA_EXT_ZBB}, > {"zbc", KVM_RISCV_ISA_EXT_ZBC}, > + {"zbkb", KVM_RISCV_ISA_EXT_ZBKB}, > + {"zbkc", KVM_RISCV_ISA_EXT_ZBKC}, > + {"zbkx", KVM_RISCV_ISA_EXT_ZBKX}, > {"zbs", KVM_RISCV_ISA_EXT_ZBS}, > {"zicbom", KVM_RISCV_ISA_EXT_ZICBOM}, > {"zicboz", KVM_RISCV_ISA_EXT_ZICBOZ}, > @@ -34,6 +37,13 @@ struct isa_ext_info isa_info_arr[] = { > {"zifencei", KVM_RISCV_ISA_EXT_ZIFENCEI}, > {"zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE}, > {"zihpm", KVM_RISCV_ISA_EXT_ZIHPM}, > + {"zknd", KVM_RISCV_ISA_EXT_ZKND}, > + {"zkne", KVM_RISCV_ISA_EXT_ZKNE}, > + {"zknh", KVM_RISCV_ISA_EXT_ZKNH}, > + {"zkr", KVM_RISCV_ISA_EXT_ZKR}, > + {"zksed", KVM_RISCV_ISA_EXT_ZKSED}, > + {"zksh", KVM_RISCV_ISA_EXT_ZKSH}, > + {"zkt", KVM_RISCV_ISA_EXT_ZKT}, > }; > > static void dump_fdt(const char *dtb_file, void *fdt) > diff --git a/riscv/include/kvm/csr.h b/riscv/include/kvm/csr.h > new file mode 100644 > index 0000000..2d27f74 > --- /dev/null > +++ b/riscv/include/kvm/csr.h > @@ -0,0 +1,15 @@ SPDX header? > +#ifndef KVM__KVM_CSR_H > +#define KVM__KVM_CSR_H > + > +#include <linux/const.h> > + > +/* Scalar Crypto Extension - Entropy */ > +#define CSR_SEED 0x015 > +#define SEED_OPST_MASK _AC(0xC0000000, UL) > +#define SEED_OPST_BIST _AC(0x00000000, UL) > +#define SEED_OPST_WAIT _AC(0x40000000, UL) > +#define SEED_OPST_ES16 _AC(0x80000000, UL) > +#define SEED_OPST_DEAD _AC(0xC0000000, UL) > +#define SEED_ENTROPY_MASK _AC(0xFFFF, UL) > + > +#endif /* KVM__KVM_CSR_H */ > diff --git a/riscv/include/kvm/kvm-config-arch.h b/riscv/include/kvm/kvm-config-arch.h > index 6d09eee..3764d7c 100644 > --- a/riscv/include/kvm/kvm-config-arch.h > +++ b/riscv/include/kvm/kvm-config-arch.h > @@ -52,6 +52,15 @@ struct kvm_config_arch { > OPT_BOOLEAN('\0', "disable-zbc", \ > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBC], \ > "Disable Zbc Extension"), \ > + OPT_BOOLEAN('\0', "disable-zbkb", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKB], \ > + "Disable Zbkb Extension"), \ > + OPT_BOOLEAN('\0', "disable-zbkc", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKC], \ > + "Disable Zbkc Extension"), \ > + OPT_BOOLEAN('\0', "disable-zbkx", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKX], \ > + "Disable Zbkx Extension"), \ > OPT_BOOLEAN('\0', "disable-zbs", \ > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBS], \ > "Disable Zbs Extension"), \ > @@ -79,6 +88,27 @@ struct kvm_config_arch { > OPT_BOOLEAN('\0', "disable-zihpm", \ > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZIHPM], \ > "Disable Zihpm Extension"), \ > + OPT_BOOLEAN('\0', "disable-zknd", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKND], \ > + "Disable Zknd Extension"), \ > + OPT_BOOLEAN('\0', "disable-zkne", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNE], \ > + "Disable Zkne Extension"), \ > + OPT_BOOLEAN('\0', "disable-zknh", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNH], \ > + "Disable Zknh Extension"), \ > + OPT_BOOLEAN('\0', "disable-zkr", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKR], \ > + "Disable Zkr Extension"), \ > + OPT_BOOLEAN('\0', "disable-zksed", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSED], \ > + "Disable Zksed Extension"), \ > + OPT_BOOLEAN('\0', "disable-zksh", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSH], \ > + "Disable Zksh Extension"), \ > + OPT_BOOLEAN('\0', "disable-zkt", \ > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKT], \ > + "Disable Zkt Extension"), \ > OPT_BOOLEAN('\0', "disable-sbi-legacy", \ > &(cfg)->sbi_ext_disabled[KVM_RISCV_SBI_EXT_V01], \ > "Disable SBI Legacy Extensions"), \ > diff --git a/riscv/kvm-cpu.c b/riscv/kvm-cpu.c > index c4e83c4..3e17c12 100644 > --- a/riscv/kvm-cpu.c > +++ b/riscv/kvm-cpu.c > @@ -1,3 +1,4 @@ > +#include "kvm/csr.h" > #include "kvm/kvm-cpu.h" > #include "kvm/kvm.h" > #include "kvm/virtio.h" > @@ -222,11 +223,41 @@ static bool kvm_cpu_riscv_sbi(struct kvm_cpu *vcpu) > return ret; > } > > +static bool kvm_cpu_riscv_csr(struct kvm_cpu *vcpu) > +{ > + int dfd = kvm_cpu__get_debug_fd(); > + bool ret = true; > + > + switch (vcpu->kvm_run->riscv_csr.csr_num) { > + case CSR_SEED: > + /* > + * We ignore the new_value and write_mask and simply > + * return a random value as SEED. > + */ > + vcpu->kvm_run->riscv_csr.ret_value = rand() & SEED_ENTROPY_MASK; Shouldn't this be vcpu->kvm_run->riscv_csr.ret_value = SEED_OPST_ES16 | (rand() & SEED_ENTROPY_MASK); > + break; > + default: > + dprintf(dfd, "Unhandled CSR access\n"); > + dprintf(dfd, "csr_num=0x%lx new_value=0x%lx\n", > + vcpu->kvm_run->riscv_csr.csr_num, > + vcpu->kvm_run->riscv_csr.new_value); > + dprintf(dfd, "write_mask=0x%lx ret_value=0x%lx\n", > + vcpu->kvm_run->riscv_csr.write_mask, > + vcpu->kvm_run->riscv_csr.ret_value); > + ret = false; > + break; > + }; Extra ';' > + > + return ret; > +} > + > bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu) > { > switch (vcpu->kvm_run->exit_reason) { > case KVM_EXIT_RISCV_SBI: > return kvm_cpu_riscv_sbi(vcpu); > + case KVM_EXIT_RISCV_CSR: > + return kvm_cpu_riscv_csr(vcpu); > default: > break; > }; > -- > 2.34.1 > Thanks, drew
On Tue, Mar 5, 2024 at 7:18 PM Andrew Jones <ajones@ventanamicro.com> wrote: > > On Wed, Feb 14, 2024 at 05:51:35PM +0530, Anup Patel wrote: > > When the scalar extensions are available expose them to the guest > > via device tree so that guest can use it. This includes extensions > > Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zkr, Zksed, Zksh, and Zkt. > > > > The Zkr extension requires SEED CSR emulation in user space so > > we also add related KVM_EXIT_RISCV_CSR handling. > > > > Signed-off-by: Anup Patel <apatel@ventanamicro.com> > > --- > > riscv/fdt.c | 10 ++++++++++ > > riscv/include/kvm/csr.h | 15 ++++++++++++++ > > riscv/include/kvm/kvm-config-arch.h | 30 ++++++++++++++++++++++++++++ > > riscv/kvm-cpu.c | 31 +++++++++++++++++++++++++++++ > > 4 files changed, 86 insertions(+) > > create mode 100644 riscv/include/kvm/csr.h > > > > diff --git a/riscv/fdt.c b/riscv/fdt.c > > index 84b6087..be87e9a 100644 > > --- a/riscv/fdt.c > > +++ b/riscv/fdt.c > > @@ -25,6 +25,9 @@ struct isa_ext_info isa_info_arr[] = { > > {"zba", KVM_RISCV_ISA_EXT_ZBA}, > > {"zbb", KVM_RISCV_ISA_EXT_ZBB}, > > {"zbc", KVM_RISCV_ISA_EXT_ZBC}, > > + {"zbkb", KVM_RISCV_ISA_EXT_ZBKB}, > > + {"zbkc", KVM_RISCV_ISA_EXT_ZBKC}, > > + {"zbkx", KVM_RISCV_ISA_EXT_ZBKX}, > > {"zbs", KVM_RISCV_ISA_EXT_ZBS}, > > {"zicbom", KVM_RISCV_ISA_EXT_ZICBOM}, > > {"zicboz", KVM_RISCV_ISA_EXT_ZICBOZ}, > > @@ -34,6 +37,13 @@ struct isa_ext_info isa_info_arr[] = { > > {"zifencei", KVM_RISCV_ISA_EXT_ZIFENCEI}, > > {"zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE}, > > {"zihpm", KVM_RISCV_ISA_EXT_ZIHPM}, > > + {"zknd", KVM_RISCV_ISA_EXT_ZKND}, > > + {"zkne", KVM_RISCV_ISA_EXT_ZKNE}, > > + {"zknh", KVM_RISCV_ISA_EXT_ZKNH}, > > + {"zkr", KVM_RISCV_ISA_EXT_ZKR}, > > + {"zksed", KVM_RISCV_ISA_EXT_ZKSED}, > > + {"zksh", KVM_RISCV_ISA_EXT_ZKSH}, > > + {"zkt", KVM_RISCV_ISA_EXT_ZKT}, > > }; > > > > static void dump_fdt(const char *dtb_file, void *fdt) > > diff --git a/riscv/include/kvm/csr.h b/riscv/include/kvm/csr.h > > new file mode 100644 > > index 0000000..2d27f74 > > --- /dev/null > > +++ b/riscv/include/kvm/csr.h > > @@ -0,0 +1,15 @@ > > SPDX header? Added in v2. > > > +#ifndef KVM__KVM_CSR_H > > +#define KVM__KVM_CSR_H > > + > > +#include <linux/const.h> > > + > > +/* Scalar Crypto Extension - Entropy */ > > +#define CSR_SEED 0x015 > > +#define SEED_OPST_MASK _AC(0xC0000000, UL) > > +#define SEED_OPST_BIST _AC(0x00000000, UL) > > +#define SEED_OPST_WAIT _AC(0x40000000, UL) > > +#define SEED_OPST_ES16 _AC(0x80000000, UL) > > +#define SEED_OPST_DEAD _AC(0xC0000000, UL) > > +#define SEED_ENTROPY_MASK _AC(0xFFFF, UL) > > + > > +#endif /* KVM__KVM_CSR_H */ > > diff --git a/riscv/include/kvm/kvm-config-arch.h b/riscv/include/kvm/kvm-config-arch.h > > index 6d09eee..3764d7c 100644 > > --- a/riscv/include/kvm/kvm-config-arch.h > > +++ b/riscv/include/kvm/kvm-config-arch.h > > @@ -52,6 +52,15 @@ struct kvm_config_arch { > > OPT_BOOLEAN('\0', "disable-zbc", \ > > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBC], \ > > "Disable Zbc Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zbkb", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKB], \ > > + "Disable Zbkb Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zbkc", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKC], \ > > + "Disable Zbkc Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zbkx", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKX], \ > > + "Disable Zbkx Extension"), \ > > OPT_BOOLEAN('\0', "disable-zbs", \ > > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBS], \ > > "Disable Zbs Extension"), \ > > @@ -79,6 +88,27 @@ struct kvm_config_arch { > > OPT_BOOLEAN('\0', "disable-zihpm", \ > > &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZIHPM], \ > > "Disable Zihpm Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zknd", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKND], \ > > + "Disable Zknd Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zkne", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNE], \ > > + "Disable Zkne Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zknh", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNH], \ > > + "Disable Zknh Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zkr", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKR], \ > > + "Disable Zkr Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zksed", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSED], \ > > + "Disable Zksed Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zksh", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSH], \ > > + "Disable Zksh Extension"), \ > > + OPT_BOOLEAN('\0', "disable-zkt", \ > > + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKT], \ > > + "Disable Zkt Extension"), \ > > OPT_BOOLEAN('\0', "disable-sbi-legacy", \ > > &(cfg)->sbi_ext_disabled[KVM_RISCV_SBI_EXT_V01], \ > > "Disable SBI Legacy Extensions"), \ > > diff --git a/riscv/kvm-cpu.c b/riscv/kvm-cpu.c > > index c4e83c4..3e17c12 100644 > > --- a/riscv/kvm-cpu.c > > +++ b/riscv/kvm-cpu.c > > @@ -1,3 +1,4 @@ > > +#include "kvm/csr.h" > > #include "kvm/kvm-cpu.h" > > #include "kvm/kvm.h" > > #include "kvm/virtio.h" > > @@ -222,11 +223,41 @@ static bool kvm_cpu_riscv_sbi(struct kvm_cpu *vcpu) > > return ret; > > } > > > > +static bool kvm_cpu_riscv_csr(struct kvm_cpu *vcpu) > > +{ > > + int dfd = kvm_cpu__get_debug_fd(); > > + bool ret = true; > > + > > + switch (vcpu->kvm_run->riscv_csr.csr_num) { > > + case CSR_SEED: > > + /* > > + * We ignore the new_value and write_mask and simply > > + * return a random value as SEED. > > + */ > > + vcpu->kvm_run->riscv_csr.ret_value = rand() & SEED_ENTROPY_MASK; > > Shouldn't this be > > vcpu->kvm_run->riscv_csr.ret_value = SEED_OPST_ES16 | (rand() & SEED_ENTROPY_MASK); Good catch. Addressed in v2. > > > + break; > > + default: > > + dprintf(dfd, "Unhandled CSR access\n"); > > + dprintf(dfd, "csr_num=0x%lx new_value=0x%lx\n", > > + vcpu->kvm_run->riscv_csr.csr_num, > > + vcpu->kvm_run->riscv_csr.new_value); > > + dprintf(dfd, "write_mask=0x%lx ret_value=0x%lx\n", > > + vcpu->kvm_run->riscv_csr.write_mask, > > + vcpu->kvm_run->riscv_csr.ret_value); > > + ret = false; > > + break; > > + }; > > Extra ';' Updated in v2. > > > + > > + return ret; > > +} > > + > > bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu) > > { > > switch (vcpu->kvm_run->exit_reason) { > > case KVM_EXIT_RISCV_SBI: > > return kvm_cpu_riscv_sbi(vcpu); > > + case KVM_EXIT_RISCV_CSR: > > + return kvm_cpu_riscv_csr(vcpu); > > default: > > break; > > }; > > -- > > 2.34.1 > > > > Thanks, > drew Regards, Anup
diff --git a/riscv/fdt.c b/riscv/fdt.c index 84b6087..be87e9a 100644 --- a/riscv/fdt.c +++ b/riscv/fdt.c @@ -25,6 +25,9 @@ struct isa_ext_info isa_info_arr[] = { {"zba", KVM_RISCV_ISA_EXT_ZBA}, {"zbb", KVM_RISCV_ISA_EXT_ZBB}, {"zbc", KVM_RISCV_ISA_EXT_ZBC}, + {"zbkb", KVM_RISCV_ISA_EXT_ZBKB}, + {"zbkc", KVM_RISCV_ISA_EXT_ZBKC}, + {"zbkx", KVM_RISCV_ISA_EXT_ZBKX}, {"zbs", KVM_RISCV_ISA_EXT_ZBS}, {"zicbom", KVM_RISCV_ISA_EXT_ZICBOM}, {"zicboz", KVM_RISCV_ISA_EXT_ZICBOZ}, @@ -34,6 +37,13 @@ struct isa_ext_info isa_info_arr[] = { {"zifencei", KVM_RISCV_ISA_EXT_ZIFENCEI}, {"zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE}, {"zihpm", KVM_RISCV_ISA_EXT_ZIHPM}, + {"zknd", KVM_RISCV_ISA_EXT_ZKND}, + {"zkne", KVM_RISCV_ISA_EXT_ZKNE}, + {"zknh", KVM_RISCV_ISA_EXT_ZKNH}, + {"zkr", KVM_RISCV_ISA_EXT_ZKR}, + {"zksed", KVM_RISCV_ISA_EXT_ZKSED}, + {"zksh", KVM_RISCV_ISA_EXT_ZKSH}, + {"zkt", KVM_RISCV_ISA_EXT_ZKT}, }; static void dump_fdt(const char *dtb_file, void *fdt) diff --git a/riscv/include/kvm/csr.h b/riscv/include/kvm/csr.h new file mode 100644 index 0000000..2d27f74 --- /dev/null +++ b/riscv/include/kvm/csr.h @@ -0,0 +1,15 @@ +#ifndef KVM__KVM_CSR_H +#define KVM__KVM_CSR_H + +#include <linux/const.h> + +/* Scalar Crypto Extension - Entropy */ +#define CSR_SEED 0x015 +#define SEED_OPST_MASK _AC(0xC0000000, UL) +#define SEED_OPST_BIST _AC(0x00000000, UL) +#define SEED_OPST_WAIT _AC(0x40000000, UL) +#define SEED_OPST_ES16 _AC(0x80000000, UL) +#define SEED_OPST_DEAD _AC(0xC0000000, UL) +#define SEED_ENTROPY_MASK _AC(0xFFFF, UL) + +#endif /* KVM__KVM_CSR_H */ diff --git a/riscv/include/kvm/kvm-config-arch.h b/riscv/include/kvm/kvm-config-arch.h index 6d09eee..3764d7c 100644 --- a/riscv/include/kvm/kvm-config-arch.h +++ b/riscv/include/kvm/kvm-config-arch.h @@ -52,6 +52,15 @@ struct kvm_config_arch { OPT_BOOLEAN('\0', "disable-zbc", \ &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBC], \ "Disable Zbc Extension"), \ + OPT_BOOLEAN('\0', "disable-zbkb", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKB], \ + "Disable Zbkb Extension"), \ + OPT_BOOLEAN('\0', "disable-zbkc", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKC], \ + "Disable Zbkc Extension"), \ + OPT_BOOLEAN('\0', "disable-zbkx", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBKX], \ + "Disable Zbkx Extension"), \ OPT_BOOLEAN('\0', "disable-zbs", \ &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZBS], \ "Disable Zbs Extension"), \ @@ -79,6 +88,27 @@ struct kvm_config_arch { OPT_BOOLEAN('\0', "disable-zihpm", \ &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZIHPM], \ "Disable Zihpm Extension"), \ + OPT_BOOLEAN('\0', "disable-zknd", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKND], \ + "Disable Zknd Extension"), \ + OPT_BOOLEAN('\0', "disable-zkne", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNE], \ + "Disable Zkne Extension"), \ + OPT_BOOLEAN('\0', "disable-zknh", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKNH], \ + "Disable Zknh Extension"), \ + OPT_BOOLEAN('\0', "disable-zkr", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKR], \ + "Disable Zkr Extension"), \ + OPT_BOOLEAN('\0', "disable-zksed", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSED], \ + "Disable Zksed Extension"), \ + OPT_BOOLEAN('\0', "disable-zksh", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKSH], \ + "Disable Zksh Extension"), \ + OPT_BOOLEAN('\0', "disable-zkt", \ + &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZKT], \ + "Disable Zkt Extension"), \ OPT_BOOLEAN('\0', "disable-sbi-legacy", \ &(cfg)->sbi_ext_disabled[KVM_RISCV_SBI_EXT_V01], \ "Disable SBI Legacy Extensions"), \ diff --git a/riscv/kvm-cpu.c b/riscv/kvm-cpu.c index c4e83c4..3e17c12 100644 --- a/riscv/kvm-cpu.c +++ b/riscv/kvm-cpu.c @@ -1,3 +1,4 @@ +#include "kvm/csr.h" #include "kvm/kvm-cpu.h" #include "kvm/kvm.h" #include "kvm/virtio.h" @@ -222,11 +223,41 @@ static bool kvm_cpu_riscv_sbi(struct kvm_cpu *vcpu) return ret; } +static bool kvm_cpu_riscv_csr(struct kvm_cpu *vcpu) +{ + int dfd = kvm_cpu__get_debug_fd(); + bool ret = true; + + switch (vcpu->kvm_run->riscv_csr.csr_num) { + case CSR_SEED: + /* + * We ignore the new_value and write_mask and simply + * return a random value as SEED. + */ + vcpu->kvm_run->riscv_csr.ret_value = rand() & SEED_ENTROPY_MASK; + break; + default: + dprintf(dfd, "Unhandled CSR access\n"); + dprintf(dfd, "csr_num=0x%lx new_value=0x%lx\n", + vcpu->kvm_run->riscv_csr.csr_num, + vcpu->kvm_run->riscv_csr.new_value); + dprintf(dfd, "write_mask=0x%lx ret_value=0x%lx\n", + vcpu->kvm_run->riscv_csr.write_mask, + vcpu->kvm_run->riscv_csr.ret_value); + ret = false; + break; + }; + + return ret; +} + bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu) { switch (vcpu->kvm_run->exit_reason) { case KVM_EXIT_RISCV_SBI: return kvm_cpu_riscv_sbi(vcpu); + case KVM_EXIT_RISCV_CSR: + return kvm_cpu_riscv_csr(vcpu); default: break; };
When the scalar extensions are available expose them to the guest via device tree so that guest can use it. This includes extensions Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zkr, Zksed, Zksh, and Zkt. The Zkr extension requires SEED CSR emulation in user space so we also add related KVM_EXIT_RISCV_CSR handling. Signed-off-by: Anup Patel <apatel@ventanamicro.com> --- riscv/fdt.c | 10 ++++++++++ riscv/include/kvm/csr.h | 15 ++++++++++++++ riscv/include/kvm/kvm-config-arch.h | 30 ++++++++++++++++++++++++++++ riscv/kvm-cpu.c | 31 +++++++++++++++++++++++++++++ 4 files changed, 86 insertions(+) create mode 100644 riscv/include/kvm/csr.h