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Diffstat (limited to 'arch/powerpc/kvm/44x_tlb.c')
-rw-r--r--arch/powerpc/kvm/44x_tlb.c528
1 files changed, 0 insertions, 528 deletions
diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c
deleted file mode 100644
index 0deef10..0000000
--- a/arch/powerpc/kvm/44x_tlb.c
+++ /dev/null
@@ -1,528 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * Copyright IBM Corp. 2007
- *
- * Authors: Hollis Blanchard <hollisb@us.ibm.com>
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kvm.h>
-#include <linux/kvm_host.h>
-#include <linux/highmem.h>
-
-#include <asm/tlbflush.h>
-#include <asm/mmu-44x.h>
-#include <asm/kvm_ppc.h>
-#include <asm/kvm_44x.h>
-#include "timing.h"
-
-#include "44x_tlb.h"
-#include "trace.h"
-
-#ifndef PPC44x_TLBE_SIZE
-#define PPC44x_TLBE_SIZE PPC44x_TLB_4K
-#endif
-
-#define PAGE_SIZE_4K (1<<12)
-#define PAGE_MASK_4K (~(PAGE_SIZE_4K - 1))
-
-#define PPC44x_TLB_UATTR_MASK \
- (PPC44x_TLB_U0|PPC44x_TLB_U1|PPC44x_TLB_U2|PPC44x_TLB_U3)
-#define PPC44x_TLB_USER_PERM_MASK (PPC44x_TLB_UX|PPC44x_TLB_UR|PPC44x_TLB_UW)
-#define PPC44x_TLB_SUPER_PERM_MASK (PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW)
-
-#ifdef DEBUG
-void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- struct kvmppc_44x_tlbe *tlbe;
- int i;
-
- printk("vcpu %d TLB dump:\n", vcpu->vcpu_id);
- printk("| %2s | %3s | %8s | %8s | %8s |\n",
- "nr", "tid", "word0", "word1", "word2");
-
- for (i = 0; i < ARRAY_SIZE(vcpu_44x->guest_tlb); i++) {
- tlbe = &vcpu_44x->guest_tlb[i];
- if (tlbe->word0 & PPC44x_TLB_VALID)
- printk(" G%2d | %02X | %08X | %08X | %08X |\n",
- i, tlbe->tid, tlbe->word0, tlbe->word1,
- tlbe->word2);
- }
-}
-#endif
-
-static inline void kvmppc_44x_tlbie(unsigned int index)
-{
- /* 0 <= index < 64, so the V bit is clear and we can use the index as
- * word0. */
- asm volatile(
- "tlbwe %[index], %[index], 0\n"
- :
- : [index] "r"(index)
- );
-}
-
-static inline void kvmppc_44x_tlbre(unsigned int index,
- struct kvmppc_44x_tlbe *tlbe)
-{
- asm volatile(
- "tlbre %[word0], %[index], 0\n"
- "mfspr %[tid], %[sprn_mmucr]\n"
- "andi. %[tid], %[tid], 0xff\n"
- "tlbre %[word1], %[index], 1\n"
- "tlbre %[word2], %[index], 2\n"
- : [word0] "=r"(tlbe->word0),
- [word1] "=r"(tlbe->word1),
- [word2] "=r"(tlbe->word2),
- [tid] "=r"(tlbe->tid)
- : [index] "r"(index),
- [sprn_mmucr] "i"(SPRN_MMUCR)
- : "cc"
- );
-}
-
-static inline void kvmppc_44x_tlbwe(unsigned int index,
- struct kvmppc_44x_tlbe *stlbe)
-{
- unsigned long tmp;
-
- asm volatile(
- "mfspr %[tmp], %[sprn_mmucr]\n"
- "rlwimi %[tmp], %[tid], 0, 0xff\n"
- "mtspr %[sprn_mmucr], %[tmp]\n"
- "tlbwe %[word0], %[index], 0\n"
- "tlbwe %[word1], %[index], 1\n"
- "tlbwe %[word2], %[index], 2\n"
- : [tmp] "=&r"(tmp)
- : [word0] "r"(stlbe->word0),
- [word1] "r"(stlbe->word1),
- [word2] "r"(stlbe->word2),
- [tid] "r"(stlbe->tid),
- [index] "r"(index),
- [sprn_mmucr] "i"(SPRN_MMUCR)
- );
-}
-
-static u32 kvmppc_44x_tlb_shadow_attrib(u32 attrib, int usermode)
-{
- /* We only care about the guest's permission and user bits. */
- attrib &= PPC44x_TLB_PERM_MASK|PPC44x_TLB_UATTR_MASK;
-
- if (!usermode) {
- /* Guest is in supervisor mode, so we need to translate guest
- * supervisor permissions into user permissions. */
- attrib &= ~PPC44x_TLB_USER_PERM_MASK;
- attrib |= (attrib & PPC44x_TLB_SUPER_PERM_MASK) << 3;
- }
-
- /* Make sure host can always access this memory. */
- attrib |= PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW;
-
- /* WIMGE = 0b00100 */
- attrib |= PPC44x_TLB_M;
-
- return attrib;
-}
-
-/* Load shadow TLB back into hardware. */
-void kvmppc_44x_tlb_load(struct kvm_vcpu *vcpu)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- for (i = 0; i <= tlb_44x_hwater; i++) {
- struct kvmppc_44x_tlbe *stlbe = &vcpu_44x->shadow_tlb[i];
-
- if (get_tlb_v(stlbe) && get_tlb_ts(stlbe))
- kvmppc_44x_tlbwe(i, stlbe);
- }
-}
-
-static void kvmppc_44x_tlbe_set_modified(struct kvmppc_vcpu_44x *vcpu_44x,
- unsigned int i)
-{
- vcpu_44x->shadow_tlb_mod[i] = 1;
-}
-
-/* Save hardware TLB to the vcpu, and invalidate all guest mappings. */
-void kvmppc_44x_tlb_put(struct kvm_vcpu *vcpu)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- for (i = 0; i <= tlb_44x_hwater; i++) {
- struct kvmppc_44x_tlbe *stlbe = &vcpu_44x->shadow_tlb[i];
-
- if (vcpu_44x->shadow_tlb_mod[i])
- kvmppc_44x_tlbre(i, stlbe);
-
- if (get_tlb_v(stlbe) && get_tlb_ts(stlbe))
- kvmppc_44x_tlbie(i);
- }
-}
-
-
-/* Search the guest TLB for a matching entry. */
-int kvmppc_44x_tlb_index(struct kvm_vcpu *vcpu, gva_t eaddr, unsigned int pid,
- unsigned int as)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- /* XXX Replace loop with fancy data structures. */
- for (i = 0; i < ARRAY_SIZE(vcpu_44x->guest_tlb); i++) {
- struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[i];
- unsigned int tid;
-
- if (eaddr < get_tlb_eaddr(tlbe))
- continue;
-
- if (eaddr > get_tlb_end(tlbe))
- continue;
-
- tid = get_tlb_tid(tlbe);
- if (tid && (tid != pid))
- continue;
-
- if (!get_tlb_v(tlbe))
- continue;
-
- if (get_tlb_ts(tlbe) != as)
- continue;
-
- return i;
- }
-
- return -1;
-}
-
-gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int gtlb_index,
- gva_t eaddr)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- struct kvmppc_44x_tlbe *gtlbe = &vcpu_44x->guest_tlb[gtlb_index];
- unsigned int pgmask = get_tlb_bytes(gtlbe) - 1;
-
- return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
-}
-
-int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
-{
- unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
-
- return kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as);
-}
-
-int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
-{
- unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
-
- return kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as);
-}
-
-void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
-{
-}
-
-void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
-{
-}
-
-static void kvmppc_44x_shadow_release(struct kvmppc_vcpu_44x *vcpu_44x,
- unsigned int stlb_index)
-{
- struct kvmppc_44x_shadow_ref *ref = &vcpu_44x->shadow_refs[stlb_index];
-
- if (!ref->page)
- return;
-
- /* Discard from the TLB. */
- /* Note: we could actually invalidate a host mapping, if the host overwrote
- * this TLB entry since we inserted a guest mapping. */
- kvmppc_44x_tlbie(stlb_index);
-
- /* Now release the page. */
- if (ref->writeable)
- kvm_release_page_dirty(ref->page);
- else
- kvm_release_page_clean(ref->page);
-
- ref->page = NULL;
-
- /* XXX set tlb_44x_index to stlb_index? */
-
- trace_kvm_stlb_inval(stlb_index);
-}
-
-void kvmppc_mmu_destroy_44x(struct kvm_vcpu *vcpu)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- for (i = 0; i <= tlb_44x_hwater; i++)
- kvmppc_44x_shadow_release(vcpu_44x, i);
-}
-
-/**
- * kvmppc_mmu_map -- create a host mapping for guest memory
- *
- * If the guest wanted a larger page than the host supports, only the first
- * host page is mapped here and the rest are demand faulted.
- *
- * If the guest wanted a smaller page than the host page size, we map only the
- * guest-size page (i.e. not a full host page mapping).
- *
- * Caller must ensure that the specified guest TLB entry is safe to insert into
- * the shadow TLB.
- */
-void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gpa_t gpaddr,
- unsigned int gtlb_index)
-{
- struct kvmppc_44x_tlbe stlbe;
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- struct kvmppc_44x_tlbe *gtlbe = &vcpu_44x->guest_tlb[gtlb_index];
- struct kvmppc_44x_shadow_ref *ref;
- struct page *new_page;
- hpa_t hpaddr;
- gfn_t gfn;
- u32 asid = gtlbe->tid;
- u32 flags = gtlbe->word2;
- u32 max_bytes = get_tlb_bytes(gtlbe);
- unsigned int victim;
-
- /* Select TLB entry to clobber. Indirectly guard against races with the TLB
- * miss handler by disabling interrupts. */
- local_irq_disable();
- victim = ++tlb_44x_index;
- if (victim > tlb_44x_hwater)
- victim = 0;
- tlb_44x_index = victim;
- local_irq_enable();
-
- /* Get reference to new page. */
- gfn = gpaddr >> PAGE_SHIFT;
- new_page = gfn_to_page(vcpu->kvm, gfn);
- if (is_error_page(new_page)) {
- printk(KERN_ERR "Couldn't get guest page for gfn %llx!\n",
- (unsigned long long)gfn);
- return;
- }
- hpaddr = page_to_phys(new_page);
-
- /* Invalidate any previous shadow mappings. */
- kvmppc_44x_shadow_release(vcpu_44x, victim);
-
- /* XXX Make sure (va, size) doesn't overlap any other
- * entries. 440x6 user manual says the result would be
- * "undefined." */
-
- /* XXX what about AS? */
-
- /* Force TS=1 for all guest mappings. */
- stlbe.word0 = PPC44x_TLB_VALID | PPC44x_TLB_TS;
-
- if (max_bytes >= PAGE_SIZE) {
- /* Guest mapping is larger than or equal to host page size. We can use
- * a "native" host mapping. */
- stlbe.word0 |= (gvaddr & PAGE_MASK) | PPC44x_TLBE_SIZE;
- } else {
- /* Guest mapping is smaller than host page size. We must restrict the
- * size of the mapping to be at most the smaller of the two, but for
- * simplicity we fall back to a 4K mapping (this is probably what the
- * guest is using anyways). */
- stlbe.word0 |= (gvaddr & PAGE_MASK_4K) | PPC44x_TLB_4K;
-
- /* 'hpaddr' is a host page, which is larger than the mapping we're
- * inserting here. To compensate, we must add the in-page offset to the
- * sub-page. */
- hpaddr |= gpaddr & (PAGE_MASK ^ PAGE_MASK_4K);
- }
-
- stlbe.word1 = (hpaddr & 0xfffffc00) | ((hpaddr >> 32) & 0xf);
- stlbe.word2 = kvmppc_44x_tlb_shadow_attrib(flags,
- vcpu->arch.shared->msr & MSR_PR);
- stlbe.tid = !(asid & 0xff);
-
- /* Keep track of the reference so we can properly release it later. */
- ref = &vcpu_44x->shadow_refs[victim];
- ref->page = new_page;
- ref->gtlb_index = gtlb_index;
- ref->writeable = !!(stlbe.word2 & PPC44x_TLB_UW);
- ref->tid = stlbe.tid;
-
- /* Insert shadow mapping into hardware TLB. */
- kvmppc_44x_tlbe_set_modified(vcpu_44x, victim);
- kvmppc_44x_tlbwe(victim, &stlbe);
- trace_kvm_stlb_write(victim, stlbe.tid, stlbe.word0, stlbe.word1,
- stlbe.word2);
-}
-
-/* For a particular guest TLB entry, invalidate the corresponding host TLB
- * mappings and release the host pages. */
-static void kvmppc_44x_invalidate(struct kvm_vcpu *vcpu,
- unsigned int gtlb_index)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++) {
- struct kvmppc_44x_shadow_ref *ref = &vcpu_44x->shadow_refs[i];
- if (ref->gtlb_index == gtlb_index)
- kvmppc_44x_shadow_release(vcpu_44x, i);
- }
-}
-
-void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
-{
- int usermode = vcpu->arch.shared->msr & MSR_PR;
-
- vcpu->arch.shadow_pid = !usermode;
-}
-
-void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 new_pid)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- int i;
-
- if (unlikely(vcpu->arch.pid == new_pid))
- return;
-
- vcpu->arch.pid = new_pid;
-
- /* Guest userspace runs with TID=0 mappings and PID=0, to make sure it
- * can't access guest kernel mappings (TID=1). When we switch to a new
- * guest PID, which will also use host PID=0, we must discard the old guest
- * userspace mappings. */
- for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++) {
- struct kvmppc_44x_shadow_ref *ref = &vcpu_44x->shadow_refs[i];
-
- if (ref->tid == 0)
- kvmppc_44x_shadow_release(vcpu_44x, i);
- }
-}
-
-static int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
- const struct kvmppc_44x_tlbe *tlbe)
-{
- gpa_t gpa;
-
- if (!get_tlb_v(tlbe))
- return 0;
-
- /* Does it match current guest AS? */
- /* XXX what about IS != DS? */
- if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
- return 0;
-
- gpa = get_tlb_raddr(tlbe);
- if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
- /* Mapping is not for RAM. */
- return 0;
-
- return 1;
-}
-
-int kvmppc_44x_emul_tlbwe(struct kvm_vcpu *vcpu, u8 ra, u8 rs, u8 ws)
-{
- struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
- struct kvmppc_44x_tlbe *tlbe;
- unsigned int gtlb_index;
- int idx;
-
- gtlb_index = kvmppc_get_gpr(vcpu, ra);
- if (gtlb_index >= KVM44x_GUEST_TLB_SIZE) {
- printk("%s: index %d\n", __func__, gtlb_index);
- kvmppc_dump_vcpu(vcpu);
- return EMULATE_FAIL;
- }
-
- tlbe = &vcpu_44x->guest_tlb[gtlb_index];
-
- /* Invalidate shadow mappings for the about-to-be-clobbered TLB entry. */
- if (tlbe->word0 & PPC44x_TLB_VALID)
- kvmppc_44x_invalidate(vcpu, gtlb_index);
-
- switch (ws) {
- case PPC44x_TLB_PAGEID:
- tlbe->tid = get_mmucr_stid(vcpu);
- tlbe->word0 = kvmppc_get_gpr(vcpu, rs);
- break;
-
- case PPC44x_TLB_XLAT:
- tlbe->word1 = kvmppc_get_gpr(vcpu, rs);
- break;
-
- case PPC44x_TLB_ATTRIB:
- tlbe->word2 = kvmppc_get_gpr(vcpu, rs);
- break;
-
- default:
- return EMULATE_FAIL;
- }
-
- idx = srcu_read_lock(&vcpu->kvm->srcu);
-
- if (tlbe_is_host_safe(vcpu, tlbe)) {
- gva_t eaddr;
- gpa_t gpaddr;
- u32 bytes;
-
- eaddr = get_tlb_eaddr(tlbe);
- gpaddr = get_tlb_raddr(tlbe);
-
- /* Use the advertised page size to mask effective and real addrs. */
- bytes = get_tlb_bytes(tlbe);
- eaddr &= ~(bytes - 1);
- gpaddr &= ~(bytes - 1);
-
- kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
- }
-
- srcu_read_unlock(&vcpu->kvm->srcu, idx);
-
- trace_kvm_gtlb_write(gtlb_index, tlbe->tid, tlbe->word0, tlbe->word1,
- tlbe->word2);
-
- kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
- return EMULATE_DONE;
-}
-
-int kvmppc_44x_emul_tlbsx(struct kvm_vcpu *vcpu, u8 rt, u8 ra, u8 rb, u8 rc)
-{
- u32 ea;
- int gtlb_index;
- unsigned int as = get_mmucr_sts(vcpu);
- unsigned int pid = get_mmucr_stid(vcpu);
-
- ea = kvmppc_get_gpr(vcpu, rb);
- if (ra)
- ea += kvmppc_get_gpr(vcpu, ra);
-
- gtlb_index = kvmppc_44x_tlb_index(vcpu, ea, pid, as);
- if (rc) {
- u32 cr = kvmppc_get_cr(vcpu);
-
- if (gtlb_index < 0)
- kvmppc_set_cr(vcpu, cr & ~0x20000000);
- else
- kvmppc_set_cr(vcpu, cr | 0x20000000);
- }
- kvmppc_set_gpr(vcpu, rt, gtlb_index);
-
- kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
- return EMULATE_DONE;
-}
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