RISC-V: KVM: Add support for SBI STA registers

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KVM userspace needs to be able to save and restore the steal-time
shared memory address. Provide the address through the get/set-one-reg
interface with two ulong-sized SBI STA extension registers (lo and hi).
64-bit KVM userspace must not set the hi register to anything other
than zero and is allowed to completely neglect saving/restoring it.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

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Andrew Jones 2023-12-20 17:00:21 +01:00 • committed by Anup Patel

parent 5b9e41321b

commit f61ce890b1

5 changed files with 97 additions and 14 deletions

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5

arch/riscv/include/asm/kvm_vcpu_sbi.h

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9

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

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37

arch/riscv/kvm/vcpu_onereg.c

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5

arch/riscv/kvm/vcpu_sbi.c

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55

arch/riscv/kvm/vcpu_sbi_sta.c

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