RISC-V: KVM: Introduce ISA extension register

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Currently, there is no provision for vmm (qemu-kvm or kvmtool) to
query about multiple-letter ISA extensions. The config register
is only used for base single letter ISA extensions.

A new ISA extension register is added that will allow the vmm
to query about any ISA extension one at a time. It is enabled for
both single letter or multi-letter ISA extensions. The ISA extension
register is useful to if the vmm requires to retrieve/set single
extension while the config register should be used if all the base
ISA extension required to retrieve or set.

For any multi-letter ISA extensions, the new register interface
must be used.

Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

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Atish Patra 2022-05-09 11:29:37 -07:00 • committed by Anup Patel

parent 92e450507d

commit affa28e4d0

2 changed files with 119 additions and 0 deletions

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20

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

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99

arch/riscv/kvm/vcpu.c

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