Commit e3219b0c authored by Andrew Jones's avatar Andrew Jones Committed by Anup Patel
Browse files

riscv: KVM: Fix hart suspend_type use 



The spec says suspend_type is 32 bits wide and "In case the data is
defined as 32bit wide, higher privilege software must ensure that it
only uses 32 bit data." Mask off upper bits of suspend_type before
using it.

Fixes: 763c8bed ("RISC-V: KVM: Implement SBI HSM suspend call")
Signed-off-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250217084506.18763-9-ajones@ventanamicro.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent c7db342e

arch/riscv/kvm/vcpu_sbi_hsm.c

+2 −1
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#include <linux/errno.h>

#include <linux/err.h>

#include <linux/kvm_host.h>

#include <linux/wordpart.h>

#include <asm/sbi.h>

#include <asm/kvm_vcpu_sbi.h>
@@ -109,7 +110,7 @@ static int kvm_sbi_ext_hsm_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, 
		}

		return 0;

	case SBI_EXT_HSM_HART_SUSPEND:

		switch (cp->a0) {

		switch (lower_32_bits(cp->a0)) {

		case SBI_HSM_SUSPEND_RET_DEFAULT:

			kvm_riscv_vcpu_wfi(vcpu);

			break;