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authorPunit Agrawal <punit.agrawal@arm.com>2018-12-11 17:10:37 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2018-12-18 15:14:47 +0000
commit4ea5af53114091e23a8fc279f25637e6c4e892c6 (patch)
treef81d7d136dc8d099ffb8a7960bad1bf11b321fe8 /virt
parentf8df73388ee25b5e5f1d26249202e7126ca8139d (diff)
downloadlinux-4ea5af53114091e23a8fc279f25637e6c4e892c6.tar.bz2
KVM: arm64: Support dirty page tracking for PUD hugepages
In preparation for creating PUD hugepages at stage 2, add support for write protecting PUD hugepages when they are encountered. Write protecting guest tables is used to track dirty pages when migrating VMs. Also, provide trivial implementations of required kvm_s2pud_* helpers to allow sharing of code with arm32. Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> [ Replaced BUG() => WARN_ON() in arm32 pud helpers ] Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/mmu.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index fb5325f7a1ac..1c669c3c1208 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1347,9 +1347,12 @@ static void stage2_wp_puds(struct kvm *kvm, pgd_t *pgd,
do {
next = stage2_pud_addr_end(kvm, addr, end);
if (!stage2_pud_none(kvm, *pud)) {
- /* TODO:PUD not supported, revisit later if supported */
- BUG_ON(stage2_pud_huge(kvm, *pud));
- stage2_wp_pmds(kvm, pud, addr, next);
+ if (stage2_pud_huge(kvm, *pud)) {
+ if (!kvm_s2pud_readonly(pud))
+ kvm_set_s2pud_readonly(pud);
+ } else {
+ stage2_wp_pmds(kvm, pud, addr, next);
+ }
}
} while (pud++, addr = next, addr != end);
}
@@ -1392,7 +1395,7 @@ static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
*
* Called to start logging dirty pages after memory region
* KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns
- * all present PMD and PTEs are write protected in the memory region.
+ * all present PUD, PMD and PTEs are write protected in the memory region.
* Afterwards read of dirty page log can be called.
*
* Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired,