KVM: PPC: Keep page physical addresses in per-slot arrays

This allocates an array for each memory slot that is added to store
the physical addresses of the pages in the slot.  This array is
vmalloc'd and accessed in kvmppc_h_enter using real_vmalloc_addr().
This allows us to remove the ram_pginfo field from the kvm_arch
struct, and removes the 64GB guest RAM limit that we had.

We use the low-order bits of the array entries to store a flag
indicating that we have done get_page on the corresponding page,
and therefore need to call put_page when we are finished with the
page.  Currently this is set for all pages except those in our
special RMO regions.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 55 insertions, 59 deletions

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index b1e3b9c..a84fedc 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -50,14 +50,6 @@
 #include <linux/vmalloc.h>
 #include <linux/highmem.h>
 
-/*
- * For now, limit memory to 64GB and require it to be large pages.
- * This value is chosen because it makes the ram_pginfo array be
- * 64kB in size, which is about as large as we want to be trying
- * to allocate with kmalloc.
- */
-#define MAX_MEM_ORDER		36
-
 #define LARGE_PAGE_ORDER	24	/* 16MB pages */
 
 /* #define EXIT_DEBUG */
@@ -147,10 +139,12 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 				       unsigned long vcpuid, unsigned long vpa)
 {
 	struct kvm *kvm = vcpu->kvm;
-	unsigned long pg_index, ra, len;
+	unsigned long gfn, pg_index, ra, len;
 	unsigned long pg_offset;
 	void *va;
 	struct kvm_vcpu *tvcpu;
+	struct kvm_memory_slot *memslot;
+	unsigned long *physp;
 
 	tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
 	if (!tvcpu)
@@ -164,14 +158,20 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 		if (vpa & 0x7f)
 			return H_PARAMETER;
 		/* registering new area; convert logical addr to real */
-		pg_index = vpa >> kvm->arch.ram_porder;
-		pg_offset = vpa & (kvm->arch.ram_psize - 1);
-		if (pg_index >= kvm->arch.ram_npages)
+		gfn = vpa >> PAGE_SHIFT;
+		memslot = gfn_to_memslot(kvm, gfn);
+		if (!memslot || !(memslot->flags & KVM_MEMSLOT_INVALID))
+			return H_PARAMETER;
+		physp = kvm->arch.slot_phys[memslot->id];
+		if (!physp)
 			return H_PARAMETER;
-		if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
+		pg_index = (gfn - memslot->base_gfn) >>
+			(kvm->arch.ram_porder - PAGE_SHIFT);
+		pg_offset = vpa & (kvm->arch.ram_psize - 1);
+		ra = physp[pg_index];
+		if (!ra)
 			return H_PARAMETER;
-		ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
-		ra |= pg_offset;
+		ra = (ra & PAGE_MASK) | pg_offset;
 		va = __va(ra);
 		if (flags <= 1)
 			len = *(unsigned short *)(va + 4);
@@ -1075,12 +1075,11 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 				struct kvm_userspace_memory_region *mem)
 {
 	unsigned long psize, porder;
-	unsigned long i, npages, totalpages;
-	unsigned long pg_ix;
-	struct kvmppc_pginfo *pginfo;
+	unsigned long i, npages;
 	unsigned long hva;
 	struct kvmppc_rma_info *ri = NULL;
 	struct page *page;
+	unsigned long *phys;
 
 	/* For now, only allow 16MB pages */
 	porder = LARGE_PAGE_ORDER;
@@ -1092,20 +1091,21 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 		return -EINVAL;
 	}
 
+	/* Allocate a slot_phys array */
 	npages = mem->memory_size >> porder;
-	totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;
-
-	/* More memory than we have space to track? */
-	if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
-		return -EINVAL;
+	phys = kvm->arch.slot_phys[mem->slot];
+	if (!phys) {
+		phys = vzalloc(npages * sizeof(unsigned long));
+		if (!phys)
+			return -ENOMEM;
+		kvm->arch.slot_phys[mem->slot] = phys;
+		kvm->arch.slot_npages[mem->slot] = npages;
+	}
 
 	/* Do we already have an RMA registered? */
 	if (mem->guest_phys_addr == 0 && kvm->arch.rma)
 		return -EINVAL;
 
-	if (totalpages > kvm->arch.ram_npages)
-		kvm->arch.ram_npages = totalpages;
-
 	/* Is this one of our preallocated RMAs? */
 	if (mem->guest_phys_addr == 0) {
 		struct vm_area_struct *vma;
@@ -1138,7 +1138,6 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 		}
 		atomic_inc(&ri->use_count);
 		kvm->arch.rma = ri;
-		kvm->arch.n_rma_pages = rma_size >> porder;
 
 		/* Update LPCR and RMOR */
 		lpcr = kvm->arch.lpcr;
@@ -1162,12 +1161,9 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 			ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
 	}
 
-	pg_ix = mem->guest_phys_addr >> porder;
-	pginfo = kvm->arch.ram_pginfo + pg_ix;
-	for (i = 0; i < npages; ++i, ++pg_ix) {
-		if (ri && pg_ix < kvm->arch.n_rma_pages) {
-			pginfo[i].pfn = ri->base_pfn +
-				(pg_ix << (porder - PAGE_SHIFT));
+	for (i = 0; i < npages; ++i) {
+		if (ri && i < ri->npages) {
+			phys[i] = (ri->base_pfn << PAGE_SHIFT) + (i << porder);
 			continue;
 		}
 		hva = mem->userspace_addr + (i << porder);
@@ -1183,7 +1179,7 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 			       hva, compound_order(page));
 			goto err;
 		}
-		pginfo[i].pfn = page_to_pfn(page);
+		phys[i] = (page_to_pfn(page) << PAGE_SHIFT) | KVMPPC_GOT_PAGE;
 	}
 
 	return 0;
@@ -1192,6 +1188,28 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 	return -EINVAL;
 }
 
+static void unpin_slot(struct kvm *kvm, int slot_id)
+{
+	unsigned long *physp;
+	unsigned long j, npages, pfn;
+	struct page *page;
+
+	physp = kvm->arch.slot_phys[slot_id];
+	npages = kvm->arch.slot_npages[slot_id];
+	if (physp) {
+		for (j = 0; j < npages; j++) {
+			if (!(physp[j] & KVMPPC_GOT_PAGE))
+				continue;
+			pfn = physp[j] >> PAGE_SHIFT;
+			page = pfn_to_page(pfn);
+			SetPageDirty(page);
+			put_page(page);
+		}
+		vfree(physp);
+		kvm->arch.slot_phys[slot_id] = NULL;
+	}
+}
+
 void kvmppc_core_commit_memory_region(struct kvm *kvm,
 				struct kvm_userspace_memory_region *mem)
 {
@@ -1203,8 +1221,6 @@ void kvmppc_core_commit_memory_region(struct kvm *kvm,
 int kvmppc_core_init_vm(struct kvm *kvm)
 {
 	long r;
-	unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
-	long err = -ENOMEM;
 	unsigned long lpcr;
 
 	/* Allocate hashed page table */
@@ -1214,19 +1230,9 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 
 	INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
 
-	kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
-				       GFP_KERNEL);
-	if (!kvm->arch.ram_pginfo) {
-		pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
-		       npages * sizeof(struct kvmppc_pginfo));
-		goto out_free;
-	}
-
-	kvm->arch.ram_npages = 0;
 	kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
 	kvm->arch.ram_porder = LARGE_PAGE_ORDER;
 	kvm->arch.rma = NULL;
-	kvm->arch.n_rma_pages = 0;
 
 	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
 
@@ -1249,25 +1255,15 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 	kvm->arch.lpcr = lpcr;
 
 	return 0;
-
- out_free:
-	kvmppc_free_hpt(kvm);
-	return err;
 }
 
 void kvmppc_core_destroy_vm(struct kvm *kvm)
 {
-	struct kvmppc_pginfo *pginfo;
 	unsigned long i;
 
-	if (kvm->arch.ram_pginfo) {
-		pginfo = kvm->arch.ram_pginfo;
-		kvm->arch.ram_pginfo = NULL;
-		for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
-			if (pginfo[i].pfn)
-				put_page(pfn_to_page(pginfo[i].pfn));
-		kfree(pginfo);
-	}
+	for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
+		unpin_slot(kvm, i);
+
 	if (kvm->arch.rma) {
 		kvm_release_rma(kvm->arch.rma);
 		kvm->arch.rma = NULL;