That is the effect of the lack of "2b57ecd0208f KVM: PPC: Book3S: Add
count cache flush parameters to kvmppc_get_cpu_char()" in Disco.
QEMU checks for KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE which is introduced
in the above commit:
(From lp-1832622-0002-target-ppc-spapr-Add-workaround-option-to-
SPAPR_CAP_.patch)
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index f0f5bf9391..4d46314276 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -2392,7 +2392,13 @@ static int parse_cap_ppc_safe_bounds_check(struct
kvm_ppc_cpu_char c)
static int parse_cap_ppc_safe_indirect_branch(struct kvm_ppc_cpu_char c)
{
- if (c.character & c.character_mask & H_CPU_CHAR_CACHE_COUNT_DIS) {
+ if ((~c.behaviour & c.behaviour_mask & H_CPU_BEHAV_FLUSH_COUNT_CACHE) &&
+ (~c.character & c.character_mask & H_CPU_CHAR_CACHE_COUNT_DIS) &&
+ (~c.character & c.character_mask & H_CPU_CHAR_BCCTRL_SERIALISED)) {
+ return SPAPR_CAP_FIXED_NA;
+ } else if (c.behaviour & c.behaviour_mask & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
{ <---
+ return SPAPR_CAP_WORKAROUND;
+ } else if (c.character & c.character_mask & H_CPU_CHAR_CACHE_COUNT_DIS) {
return SPAPR_CAP_FIXED_CCD;
} else if (c.character & c.character_mask & H_CPU_CHAR_BCCTRL_SERIALISED) {
return SPAPR_CAP_FIXED_IBS;
But I'll test the extra two scenarios anyway.
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https://bugs.launchpad.net/bugs/1832622
Title:
QEMU - count cache flush Spectre v2 mitigation (CVE) (required for
POWER9 DD2.3)
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