| Message ID | 1544717174-15116-1-git-send-email-will.deacon@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: kvm: Avoid setting the upper 32 bits of VTCR_EL2 to 1 | expand |
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 6f602af5263c..2dafd936d84d 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -104,7 +104,7 @@ TCR_EL2_ORGN0_MASK | TCR_EL2_IRGN0_MASK | TCR_EL2_T0SZ_MASK) /* VTCR_EL2 Registers bits */ -#define VTCR_EL2_RES1 (1 << 31) +#define VTCR_EL2_RES1 (1U << 31) #define VTCR_EL2_HD (1 << 22) #define VTCR_EL2_HA (1 << 21) #define VTCR_EL2_PS_SHIFT TCR_EL2_PS_SHIFT
Although bit 31 of VTCR_EL2 is RES1, we inadvertently end up setting all of the upper 32 bits to 1 as well because we define VTCR_EL2_RES1 as signed, which is sign-extended when assigning to kvm->arch.vtcr. Lucky for us, the architecture currently treats these upper bits as RES0 so, whilst we've been naughty, we haven't set fire to anything yet. Cc: <stable@vger.kernel.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> --- arch/arm64/include/asm/kvm_arm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)