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KVM: riscv: Support guest wrs.nto

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When a guest traps on wrs.nto, call kvm_vcpu_on_spin() to attempt
to yield to the lock holding VCPU. Also extend the KVM ISA extension
ONE_REG interface to allow KVM userspace to detect and enable the
Zawrs extension for the Guest/VM.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240426100820.14762-13-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andrew Jones
2024-04-26 12:08:25 +02:00
committed by Palmer Dabbelt
parent 244c18fbf6
commit 86d6a86e59
5 changed files with 20 additions and 0 deletions
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arch/riscv/include/asm/kvm_host.h
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@@ -69,6 +69,7 @@ struct kvm_vcpu_stat {
struct kvm_vcpu_stat_generic generic;
u64 ecall_exit_stat;
u64 wfi_exit_stat;
u64 wrs_exit_stat;
u64 mmio_exit_user;
u64 mmio_exit_kernel;
u64 csr_exit_user;