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| author |  Andrew Jones <ajones@ventanamicro.com>
| 2022-10-02 10:19:05 +0530 |
|---|---|---|
| committer |  Anup Patel <anup@brainfault.org>
| 2022-10-02 10:19:05 +0530 |
| commit | 56852c6211971798dfbe4098c8a8528b59234de2 (patch) | |
| tree | 631a9fc4677d51f62689adf8c2b95beca7ae9d56 | |
| parent | RISC-V: KVM: Provide UAPI for Zicbom block size (diff) | |
| download | linux-56852c6211971798dfbe4098c8a8528b59234de2.tar.gz linux-56852c6211971798dfbe4098c8a8528b59234de2.tar.bz2 linux-56852c6211971798dfbe4098c8a8528b59234de2.zip | |
RISC-V: KVM: Expose Zicbom to the guest
Guests may use the cbo.inval,clean,flush instructions when the
CPU has the Zicbom extension and the hypervisor sets henvcfg.CBIE
(for cbo.inval) and henvcfg.CBCFE (for cbo.clean,flush).
Add Zicbom support for KVM guests which may be enabled and
disabled from KVM userspace using the ISA extension ONE_REG API.
Also opportunistically switch the other isa extension checks in
kvm_riscv_vcpu_update_config() to riscv_isa_extension_available().
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/include/uapi/asm/kvm.h | 1 | ||||
| -rw-r--r-- | arch/riscv/kvm/vcpu.c | 9 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h index 3d7771300567..8985ff234c01 100644 --- a/arch/riscv/include/uapi/asm/kvm.h +++ b/arch/riscv/include/uapi/asm/kvm.h @@ -101,6 +101,7 @@ enum KVM_RISCV_ISA_EXT_ID { KVM_RISCV_ISA_EXT_SSTC, KVM_RISCV_ISA_EXT_SVINVAL, KVM_RISCV_ISA_EXT_ZIHINTPAUSE, + KVM_RISCV_ISA_EXT_ZICBOM, KVM_RISCV_ISA_EXT_MAX, }; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index b0a0ce6d16ef..f55d15a8a410 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -59,6 +59,7 @@ static const unsigned long kvm_isa_ext_arr[] = { KVM_ISA_EXT_ARR(SVINVAL), KVM_ISA_EXT_ARR(SVPBMT), KVM_ISA_EXT_ARR(ZIHINTPAUSE), + KVM_ISA_EXT_ARR(ZICBOM), }; static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext) @@ -799,11 +800,15 @@ static void kvm_riscv_vcpu_update_config(const unsigned long *isa) { u64 henvcfg = 0; - if (__riscv_isa_extension_available(isa, RISCV_ISA_EXT_SVPBMT)) + if (riscv_isa_extension_available(isa, SVPBMT)) henvcfg |= ENVCFG_PBMTE; - if (__riscv_isa_extension_available(isa, RISCV_ISA_EXT_SSTC)) + if (riscv_isa_extension_available(isa, SSTC)) henvcfg |= ENVCFG_STCE; + + if (riscv_isa_extension_available(isa, ZICBOM)) + henvcfg |= (ENVCFG_CBIE | ENVCFG_CBCFE); + csr_write(CSR_HENVCFG, henvcfg); #ifdef CONFIG_32BIT csr_write(CSR_HENVCFGH, henvcfg >> 32); |