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target/ppc: Add kvmppc_hpt_needs_host_contiguous_pages() helper

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KVM HV has a restriction that for HPT mode guests, guest pages must be hpa
contiguous as well as gpa contiguous.  We have to account for that in
various places.  We determine whether we're subject to this restriction
from the SMMU information exposed by KVM.

Planned cleanups to the way we handle this will require knowing whether
this restriction is in play in wider parts of the code.  So, expose a
helper function which returns it.

This does mean some redundant calls to kvm_get_smmu_info(), but they'll go
away again with future cleanups.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
David Gibson 2018-06-14 12:11:08 +10:00
parent e2e4f64118
commit 24c6863c7b
2 changed files with 21 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

17
target/ppc/kvm.c
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@ -406,9 +406,22 @@ target_ulong kvmppc_configure_v3_mmu(PowerPCCPU *cpu,
}
}
bool kvmppc_hpt_needs_host_contiguous_pages(void)
{
PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
static struct kvm_ppc_smmu_info smmu_info;
if (!kvm_enabled()) {
return false;
}
kvm_get_smmu_info(cpu, &smmu_info);
return !!(smmu_info.flags & KVM_PPC_PAGE_SIZES_REAL);
}
static bool kvm_valid_page_size(uint32_t flags, long rampgsize, uint32_t shift)
{
if (!(flags & KVM_PPC_PAGE_SIZES_REAL)) {
if (!kvmppc_hpt_needs_host_contiguous_pages()) {
return true;
}
@ -445,7 +458,7 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
/* If we have HV KVM, we need to forbid CI large pages if our
* host page size is smaller than 64K.
*/
if (smmu_info.flags & KVM_PPC_PAGE_SIZES_REAL) {
if (kvmppc_hpt_needs_host_contiguous_pages()) {
if (getpagesize() >= 0x10000) {
cpu->hash64_opts->flags |= PPC_HASH64_CI_LARGEPAGE;
} else {