RISC-V: KVM: Expose Zicbom to the guest

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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>

...

This commit is contained in:

Andrew Jones 2022-10-02 10:19:05 +05:30 • committed by Anup Patel

parent afd5dde9a1

commit 56852c6211

2 changed files with 8 additions and 2 deletions

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1

arch/riscv/include/uapi/asm/kvm.h

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9

arch/riscv/kvm/vcpu.c

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