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riscv: KVM: Fix SBI sleep_type use

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The spec says sleep_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 sleep_type before
using it.

Fixes: 023c15151f ("RISC-V: KVM: Add SBI system suspend support")
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250217084506.18763-12-ajones@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones 2025-02-17 09:45:12 +01:00 • committed by Anup Patel
parent b901484852
commit 351e02b173
1 changed files with 2 additions and 1 deletions
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3
arch/riscv/kvm/vcpu_sbi_system.c
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@ -4,6 +4,7 @@
*/
#include <linux/kvm_host.h>
#include <linux/wordpart.h>
#include <asm/kvm_vcpu_sbi.h>
#include <asm/sbi.h>
@ -19,7 +20,7 @@ static int kvm_sbi_ext_susp_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
switch (funcid) {
case SBI_EXT_SUSP_SYSTEM_SUSPEND:
if (cp->a0 != SBI_SUSP_SLEEP_TYPE_SUSPEND_TO_RAM) {
if (lower_32_bits(cp->a0) != SBI_SUSP_SLEEP_TYPE_SUSPEND_TO_RAM) {
retdata->err_val = SBI_ERR_INVALID_PARAM;
return 0;
}