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openwrt/target/linux/layerscape/patches-4.9/820-kvm-support-layerscape....

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From fe22151c95c02c6bb145ea6c3685941e8fb09d60 Mon Sep 17 00:00:00 2001
From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Thu, 5 Jul 2018 17:43:16 +0800
Subject: [PATCH 32/32] kvm: support layerscape
This is an integrated patch for layerscape kvm support.
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
arch/arm/include/asm/kvm_mmu.h | 3 +-
arch/arm/kvm/mmu.c | 56 ++++++++++++++++++++++++++++++--
arch/arm64/include/asm/kvm_mmu.h | 14 ++++++--
virt/kvm/arm/vgic/vgic-its.c | 24 +++++++++++---
virt/kvm/arm/vgic/vgic-v2.c | 3 +-
5 files changed, 88 insertions(+), 12 deletions(-)
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -55,7 +55,8 @@ void stage2_unmap_vm(struct kvm *kvm);
int kvm_alloc_stage2_pgd(struct kvm *kvm);
void kvm_free_stage2_pgd(struct kvm *kvm);
int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
- phys_addr_t pa, unsigned long size, bool writable);
+ phys_addr_t pa, unsigned long size, bool writable,
+ pgprot_t prot);
int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1020,9 +1020,11 @@ static int stage2_pmdp_test_and_clear_yo
* @guest_ipa: The IPA at which to insert the mapping
* @pa: The physical address of the device
* @size: The size of the mapping
+ * @prot: S2 page translation bits
*/
int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
- phys_addr_t pa, unsigned long size, bool writable)
+ phys_addr_t pa, unsigned long size, bool writable,
+ pgprot_t prot)
{
phys_addr_t addr, end;
int ret = 0;
@@ -1033,7 +1035,7 @@ int kvm_phys_addr_ioremap(struct kvm *kv
pfn = __phys_to_pfn(pa);
for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
- pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE);
+ pte_t pte = pfn_pte(pfn, prot);
if (writable)
pte = kvm_s2pte_mkwrite(pte);
@@ -1057,6 +1059,30 @@ out:
return ret;
}
+#ifdef CONFIG_ARM64
+static pgprot_t stage1_to_stage2_pgprot(pgprot_t prot)
+{
+ switch (pgprot_val(prot) & PTE_ATTRINDX_MASK) {
+ case PTE_ATTRINDX(MT_DEVICE_nGnRE):
+ case PTE_ATTRINDX(MT_DEVICE_nGnRnE):
+ case PTE_ATTRINDX(MT_DEVICE_GRE):
+ return PAGE_S2_DEVICE;
+ case PTE_ATTRINDX(MT_NORMAL_NC):
+ case PTE_ATTRINDX(MT_NORMAL):
+ return (pgprot_val(prot) & PTE_SHARED)
+ ? PAGE_S2
+ : PAGE_S2_NS;
+ }
+
+ return PAGE_S2_DEVICE;
+}
+#else
+static pgprot_t stage1_to_stage2_pgprot(pgprot_t prot)
+{
+ return PAGE_S2_DEVICE;
+}
+#endif
+
static bool transparent_hugepage_adjust(kvm_pfn_t *pfnp, phys_addr_t *ipap)
{
kvm_pfn_t pfn = *pfnp;
@@ -1308,6 +1334,19 @@ static int user_mem_abort(struct kvm_vcp
hugetlb = true;
gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT;
} else {
+ if (!is_vm_hugetlb_page(vma)) {
+ pte_t *pte;
+ spinlock_t *ptl;
+ pgprot_t prot;
+
+ pte = get_locked_pte(current->mm, memslot->userspace_addr, &ptl);
+ prot = stage1_to_stage2_pgprot(__pgprot(pte_val(*pte)));
+ pte_unmap_unlock(pte, ptl);
+#ifdef CONFIG_ARM64
+ if (pgprot_val(prot) == pgprot_val(PAGE_S2_NS))
+ mem_type = PAGE_S2_NS;
+#endif
+ }
/*
* Pages belonging to memslots that don't have the same
* alignment for userspace and IPA cannot be mapped using
@@ -1345,6 +1384,11 @@ static int user_mem_abort(struct kvm_vcp
if (is_error_noslot_pfn(pfn))
return -EFAULT;
+#ifdef CONFIG_ARM64
+ if (pgprot_val(mem_type) == pgprot_val(PAGE_S2_NS)) {
+ flags |= KVM_S2PTE_FLAG_IS_IOMAP;
+ } else
+#endif
if (kvm_is_device_pfn(pfn)) {
mem_type = PAGE_S2_DEVICE;
flags |= KVM_S2PTE_FLAG_IS_IOMAP;
@@ -1882,6 +1926,9 @@ int kvm_arch_prepare_memory_region(struc
gpa_t gpa = mem->guest_phys_addr +
(vm_start - mem->userspace_addr);
phys_addr_t pa;
+ pgprot_t prot;
+ pte_t *pte;
+ spinlock_t *ptl;
pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
pa += vm_start - vma->vm_start;
@@ -1891,10 +1938,13 @@ int kvm_arch_prepare_memory_region(struc
ret = -EINVAL;
goto out;
}
+ pte = get_locked_pte(current->mm, mem->userspace_addr, &ptl);
+ prot = stage1_to_stage2_pgprot(__pgprot(pte_val(*pte)));
+ pte_unmap_unlock(pte, ptl);
ret = kvm_phys_addr_ioremap(kvm, gpa, pa,
vm_end - vm_start,
- writable);
+ writable, prot);
if (ret)
break;
}
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -167,7 +167,8 @@ void stage2_unmap_vm(struct kvm *kvm);
int kvm_alloc_stage2_pgd(struct kvm *kvm);
void kvm_free_stage2_pgd(struct kvm *kvm);
int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
- phys_addr_t pa, unsigned long size, bool writable);
+ phys_addr_t pa, unsigned long size, bool writable,
+ pgprot_t prot);
int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
@@ -274,8 +275,15 @@ static inline void __coherent_cache_gues
static inline void __kvm_flush_dcache_pte(pte_t pte)
{
- struct page *page = pte_page(pte);
- kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
+ if (pfn_valid(pte_pfn(pte))) {
+ struct page *page = pte_page(pte);
+ kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
+ } else {
+ void __iomem *va = ioremap_cache_ns(pte_pfn(pte) << PAGE_SHIFT, PAGE_SIZE);
+
+ kvm_flush_dcache_to_poc(va, PAGE_SIZE);
+ iounmap(va);
+ }
}
static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -176,6 +176,8 @@ static struct its_itte *find_itte(struct
#define GIC_LPI_OFFSET 8192
+#define VITS_TYPER_DEVBITS 17
+
/*
* Finds and returns a collection in the ITS collection table.
* Must be called with the its_lock mutex held.
@@ -375,7 +377,7 @@ static unsigned long vgic_mmio_read_its_
* To avoid memory waste in the guest, we keep the number of IDBits and
* DevBits low - as least for the time being.
*/
- reg |= 0x0f << GITS_TYPER_DEVBITS_SHIFT;
+ reg |= GIC_ENCODE_SZ(VITS_TYPER_DEVBITS, 5) << GITS_TYPER_DEVBITS_SHIFT;
reg |= 0x0f << GITS_TYPER_IDBITS_SHIFT;
return extract_bytes(reg, addr & 7, len);
@@ -601,16 +603,30 @@ static int vgic_its_cmd_handle_movi(stru
* Check whether an ID can be stored into the corresponding guest table.
* For a direct table this is pretty easy, but gets a bit nasty for
* indirect tables. We check whether the resulting guest physical address
- * is actually valid (covered by a memslot and guest accessbible).
+ * is actually valid (covered by a memslot and guest accessible).
* For this we have to read the respective first level entry.
*/
-static bool vgic_its_check_id(struct vgic_its *its, u64 baser, int id)
+static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id)
{
int l1_tbl_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
+ u64 indirect_ptr, type = GITS_BASER_TYPE(baser);
int index;
- u64 indirect_ptr;
gfn_t gfn;
+ switch (type) {
+ case GITS_BASER_TYPE_DEVICE:
+ if (id >= BIT_ULL(VITS_TYPER_DEVBITS))
+ return false;
+ break;
+ case GITS_BASER_TYPE_COLLECTION:
+ /* as GITS_TYPER.CIL == 0, ITS supports 16-bit collection ID */
+ if (id >= BIT_ULL(16))
+ return false;
+ break;
+ default:
+ return false;
+ }
+
if (!(baser & GITS_BASER_INDIRECT)) {
phys_addr_t addr;
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -290,7 +290,8 @@ int vgic_v2_map_resources(struct kvm *kv
if (!static_branch_unlikely(&vgic_v2_cpuif_trap)) {
ret = kvm_phys_addr_ioremap(kvm, dist->vgic_cpu_base,
kvm_vgic_global_state.vcpu_base,
- KVM_VGIC_V2_CPU_SIZE, true);
+ KVM_VGIC_V2_CPU_SIZE, true,
+ PAGE_S2_DEVICE);
if (ret) {
kvm_err("Unable to remap VGIC CPU to VCPU\n");
goto out;
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