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Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_hv.c')
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c122
1 files changed, 83 insertions, 39 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 87016ccd8648..cc18f3d67a57 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -34,8 +34,6 @@
#include <asm/ppc-opcode.h>
#include <asm/cputable.h>
-/* Pages in the VRMA are 16MB pages */
-#define VRMA_PAGE_ORDER 24
#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
@@ -95,17 +93,31 @@ void kvmppc_free_hpt(struct kvm *kvm)
free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
}
-void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot)
+/* Bits in first HPTE dword for pagesize 4k, 64k or 16M */
+static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize)
+{
+ return (pgsize > 0x1000) ? HPTE_V_LARGE : 0;
+}
+
+/* Bits in second HPTE dword for pagesize 4k, 64k or 16M */
+static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize)
+{
+ return (pgsize == 0x10000) ? 0x1000 : 0;
+}
+
+void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
+ unsigned long porder)
{
- struct kvm *kvm = vcpu->kvm;
unsigned long i;
unsigned long npages;
unsigned long hp_v, hp_r;
unsigned long addr, hash;
- unsigned long porder = kvm->arch.ram_porder;
+ unsigned long psize;
+ unsigned long hp0, hp1;
long ret;
- npages = kvm->arch.slot_npages[memslot->id];
+ psize = 1ul << porder;
+ npages = memslot->npages >> (porder - PAGE_SHIFT);
/* VRMA can't be > 1TB */
if (npages > 1ul << (40 - porder))
@@ -114,6 +126,11 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot)
if (npages > HPT_NPTEG)
npages = HPT_NPTEG;
+ hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
+ HPTE_V_BOLTED | hpte0_pgsize_encoding(psize);
+ hp1 = hpte1_pgsize_encoding(psize) |
+ HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
+
for (i = 0; i < npages; ++i) {
addr = i << porder;
/* can't use hpt_hash since va > 64 bits */
@@ -125,10 +142,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot)
* is available and use it.
*/
hash = (hash << 3) + 7;
- hp_v = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
- (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
- HPTE_V_LARGE | HPTE_V_VALID;
- hp_r = addr | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
+ hp_v = hp0 | ((addr >> 16) & ~0x7fUL);
+ hp_r = hp1 | addr;
ret = kvmppc_virtmode_h_enter(vcpu, H_EXACT, hash, hp_v, hp_r);
if (ret != H_SUCCESS) {
pr_err("KVM: map_vrma at %lx failed, ret=%ld\n",
@@ -176,22 +191,25 @@ static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
* one already in the kvm->arch.slot_phys[][] arrays.
*/
static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
- struct kvm_memory_slot *memslot)
+ struct kvm_memory_slot *memslot,
+ unsigned long psize)
{
unsigned long start;
- long np;
- struct page *page, *pages[1];
+ long np, err;
+ struct page *page, *hpage, *pages[1];
+ unsigned long s, pgsize;
unsigned long *physp;
- unsigned long pfn, i;
+ unsigned int got, pgorder;
+ unsigned long pfn, i, npages;
physp = kvm->arch.slot_phys[memslot->id];
if (!physp)
return -EINVAL;
- i = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT);
- if (physp[i])
+ if (physp[gfn - memslot->base_gfn])
return 0;
page = NULL;
+ pgsize = psize;
start = gfn_to_hva_memslot(memslot, gfn);
/* Instantiate and get the page we want access to */
@@ -199,25 +217,46 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
if (np != 1)
return -EINVAL;
page = pages[0];
-
- /* Check it's a 16MB page */
- if (!PageHead(page) ||
- compound_order(page) != (kvm->arch.ram_porder - PAGE_SHIFT)) {
- pr_err("page at %lx isn't 16MB (o=%d)\n",
- start, compound_order(page));
- put_page(page);
- return -EINVAL;
+ got = KVMPPC_GOT_PAGE;
+
+ /* See if this is a large page */
+ s = PAGE_SIZE;
+ if (PageHuge(page)) {
+ hpage = compound_head(page);
+ s <<= compound_order(hpage);
+ /* Get the whole large page if slot alignment is ok */
+ if (s > psize && slot_is_aligned(memslot, s) &&
+ !(memslot->userspace_addr & (s - 1))) {
+ start &= ~(s - 1);
+ pgsize = s;
+ page = hpage;
+ }
}
+ err = -EINVAL;
+ if (s < psize)
+ goto out;
pfn = page_to_pfn(page);
+ npages = pgsize >> PAGE_SHIFT;
+ pgorder = __ilog2(npages);
+ physp += (gfn - memslot->base_gfn) & ~(npages - 1);
spin_lock(&kvm->arch.slot_phys_lock);
- if (!physp[i])
- physp[i] = (pfn << PAGE_SHIFT) | KVMPPC_GOT_PAGE;
- else
- put_page(page);
+ for (i = 0; i < npages; ++i) {
+ if (!physp[i]) {
+ physp[i] = ((pfn + i) << PAGE_SHIFT) + got + pgorder;
+ got = 0;
+ }
+ }
spin_unlock(&kvm->arch.slot_phys_lock);
+ err = 0;
- return 0;
+ out:
+ if (got) {
+ if (PageHuge(page))
+ page = compound_head(page);
+ put_page(page);
+ }
+ return err;
}
/*
@@ -242,7 +281,9 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
memslot = gfn_to_memslot(kvm, gfn);
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
return H_PARAMETER;
- if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
+ if (!slot_is_aligned(memslot, psize))
+ return H_PARAMETER;
+ if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0)
return H_PARAMETER;
preempt_disable();
@@ -269,8 +310,8 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
struct kvm_memory_slot *memslot;
unsigned long gfn = gpa >> PAGE_SHIFT;
struct page *page;
- unsigned long offset;
- unsigned long pfn, pa;
+ unsigned long psize, offset;
+ unsigned long pa;
unsigned long *physp;
memslot = gfn_to_memslot(kvm, gfn);
@@ -279,20 +320,23 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
physp = kvm->arch.slot_phys[memslot->id];
if (!physp)
return NULL;
- physp += (gfn - memslot->base_gfn) >>
- (kvm->arch.ram_porder - PAGE_SHIFT);
+ physp += gfn - memslot->base_gfn;
pa = *physp;
if (!pa) {
- if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
+ if (kvmppc_get_guest_page(kvm, gfn, memslot, PAGE_SIZE) < 0)
return NULL;
pa = *physp;
}
- pfn = pa >> PAGE_SHIFT;
- page = pfn_to_page(pfn);
+ page = pfn_to_page(pa >> PAGE_SHIFT);
+ psize = PAGE_SIZE;
+ if (PageHuge(page)) {
+ page = compound_head(page);
+ psize <<= compound_order(page);
+ }
get_page(page);
- offset = gpa & (kvm->arch.ram_psize - 1);
+ offset = gpa & (psize - 1);
if (nb_ret)
- *nb_ret = kvm->arch.ram_psize - offset;
+ *nb_ret = psize - offset;
return page_address(page) + offset;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-04 18:07:50 +0000