diff options
| author | Andrew Jones <ajones@ventanamicro.com> | 2022-10-02 10:18:59 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2022-10-02 10:18:59 +0530 |
| commit | afd5dde9a186b8fc5742fff707f184760c4af1a9 (patch) | |
| tree | c904eeb853e64c2e09c234412c0a0fe5105fff6a /arch/riscv/kvm | |
| parent | 1b5cbb8733f924c99bc48a8e4c2a95449f0f514d (diff) | |
| download | linux-afd5dde9a186b8fc5742fff707f184760c4af1a9.tar.bz2 | |
RISC-V: KVM: Provide UAPI for Zicbom block size
We're about to allow guests to use the Zicbom extension. KVM
userspace needs to know the cache block size in order to
properly advertise it to the guest. Provide a virtual config
register for userspace to get it with the GET_ONE_REG API, but
setting it cannot be supported, so disallow SET_ONE_REG.
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>
Diffstat (limited to 'arch/riscv/kvm')
| -rw-r--r-- | arch/riscv/kvm/vcpu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 61fe1604e8ea..b0a0ce6d16ef 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -18,6 +18,7 @@ #include <linux/fs.h> #include <linux/kvm_host.h> #include <asm/csr.h> +#include <asm/cacheflush.h> #include <asm/hwcap.h> const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { @@ -261,6 +262,11 @@ static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu, case KVM_REG_RISCV_CONFIG_REG(isa): reg_val = vcpu->arch.isa[0] & KVM_RISCV_BASE_ISA_MASK; break; + case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size): + if (!riscv_isa_extension_available(vcpu->arch.isa, ZICBOM)) + return -EINVAL; + reg_val = riscv_cbom_block_size; + break; default: return -EINVAL; } @@ -318,6 +324,8 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu, return -EOPNOTSUPP; } break; + case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size): + return -EOPNOTSUPP; default: return -EINVAL; } |