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RISC-V: KVM: Add SBI HSM extension in KVM

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SBI HSM extension allows OS to start/stop harts any time. It also allows
ordered booting of harts instead of random booting.

Implement SBI HSM exntesion and designate the vcpu 0 as the boot vcpu id.
All other non-zero non-booting vcpus should be brought up by the OS
implementing HSM extension. If the guest OS doesn't implement HSM
extension, only single vcpu will be available to OS.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2021-11-18 00:39:12 -08:00
committed by Anup Patel
parent 5f862df558
commit 3e1d86569c
5 changed files with 134 additions and 0 deletions
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arch/riscv/include/asm/sbi.h
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@@ -90,6 +90,7 @@ enum sbi_hsm_hart_status {
#define SBI_ERR_INVALID_PARAM -3
#define SBI_ERR_DENIED -4
#define SBI_ERR_INVALID_ADDRESS -5
#define SBI_ERR_ALREADY_AVAILABLE -6
extern unsigned long sbi_spec_version;
struct sbiret {