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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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arch/riscv/include/uapi/asm/kvm.h
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@@ -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 */