Hi David,
On 2020-11-30 15:26, David Brazdil wrote:
@@ -1227,9 +1229,16 @@ static int set_id_aa64pfr0_el1(struct kvm_vcpu
*vcpu,
(csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
return -EINVAL;
- /* We can only differ with CSV2, and anything else is an error */
+ /* Same thing for CSV3 */
+ csv3 = cpuid_feature_extract_unsigned_field(val,
ID_AA64PFR0_CSV3_SHIFT);
+ if (csv3 > 1 ||
+ (csv3 && arm64_get_meltdown_state() != SPECTRE_UNAFFECTED))
+ return -EINVAL;
+
+ /* We can only differ with CSV[23], and anything else is an error */
val ^= read_id_reg(vcpu, rd, false);
- val &= ~(0xFUL << ID_AA64PFR0_CSV2_SHIFT);
+ val &= ~((0xFUL << ID_AA64PFR0_CSV2_SHIFT) ||
+ (0xFUL << ID_AA64PFR0_CSV3_SHIFT));
That boolean OR looks like a typo.
It definitely is. Who the hell is writing this code?
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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