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RISC-V: KVM: Provide UAPI for Zicbom block size

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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>
This commit is contained in:
Andrew Jones 2022-10-02 10:18:59 +05:30 committed by Anup Patel
parent 1b5cbb8733
commit afd5dde9a1
3 changed files with 11 additions and 0 deletions
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1
arch/riscv/include/uapi/asm/kvm.h
View File

@ -48,6 +48,7 @@ struct kvm_sregs {
/* CONFIG registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_config {
unsigned long isa;
unsigned long zicbom_block_size;
};
/* CORE registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */

8
arch/riscv/kvm/vcpu.c
View File

@ -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;
}

2
arch/riscv/mm/dma-noncoherent.c
View File

@ -13,6 +13,8 @@
#include <asm/cacheflush.h>
unsigned int riscv_cbom_block_size;
EXPORT_SYMBOL_GPL(riscv_cbom_block_size);
static bool noncoherent_supported;
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,