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Subject[PATCH v5 4/9] mmu: spp: Add functions to create/destroy SPP bitmap block
Date
Create access bitmap for SPP subpages, the bitmap can
be accessed with a gfn. The initial access bitmap for each
physical page is 0xFFFFFFFF, meaning SPP is not enabled for the
subpages.

Co-developed-by: He Chen <he.chen@linux.intel.com>
Signed-off-by: He Chen <he.chen@linux.intel.com>
Co-developed-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/vmx/spp.c | 59 +++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/spp.h | 1 +
3 files changed, 61 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index eb18f4dd993d..fe6417756983 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -799,6 +799,7 @@ struct kvm_lpage_info {

struct kvm_arch_memory_slot {
struct kvm_rmap_head *rmap[KVM_NR_PAGE_SIZES];
+ u32 *subpage_wp_info;
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
unsigned short *gfn_track[KVM_PAGE_TRACK_MAX];
};
diff --git a/arch/x86/kvm/vmx/spp.c b/arch/x86/kvm/vmx/spp.c
index 1b33cd39108b..7e66d87186a2 100644
--- a/arch/x86/kvm/vmx/spp.c
+++ b/arch/x86/kvm/vmx/spp.c
@@ -22,6 +22,14 @@ static int is_spp_shadow_present(u64 pte)
return pte & PT_PRESENT_MASK;
}

+static u32 *gfn_to_subpage_wp_info(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+ unsigned long idx;
+
+ idx = gfn_to_index(gfn, slot->base_gfn, PT_PAGE_TABLE_LEVEL);
+ return &slot->arch.subpage_wp_info[idx];
+}
+
static bool __rmap_open_subpage_bit(struct kvm *kvm,
struct kvm_rmap_head *rmap_head)
{
@@ -228,6 +236,57 @@ int kvm_spp_setup_structure(struct kvm_vcpu *vcpu,
}
EXPORT_SYMBOL_GPL(kvm_spp_setup_structure);

+static int kvm_spp_create_bitmaps(struct kvm *kvm)
+{
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+ int i, j, ret;
+ u32 *buff;
+
+ for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
+ slots = __kvm_memslots(kvm, i);
+ kvm_for_each_memslot(memslot, slots) {
+ buff = kvzalloc(memslot->npages*
+ sizeof(*memslot->arch.subpage_wp_info),
+ GFP_KERNEL);
+
+ if (!buff) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+ memslot->arch.subpage_wp_info = buff;
+
+ for(j = 0; j< memslot->npages; j++)
+ buff[j] = FULL_SPP_ACCESS;
+ }
+ }
+
+ return 0;
+out_free:
+ for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
+ slots = __kvm_memslots(kvm, i);
+ kvm_for_each_memslot(memslot, slots) {
+ if (memslot->arch.subpage_wp_info) {
+ kvfree(memslot->arch.subpage_wp_info);
+ memslot->arch.subpage_wp_info = NULL;
+ }
+ }
+ }
+
+ return ret;
+}
+
+
+void kvm_spp_free_memslot(struct kvm_memory_slot *free,
+ struct kvm_memory_slot *dont)
+{
+ if (!dont || free->arch.subpage_wp_info !=
+ dont->arch.subpage_wp_info) {
+ kvfree(free->arch.subpage_wp_info);
+ free->arch.subpage_wp_info = NULL;
+ }
+}
+
inline u64 construct_spptp(unsigned long root_hpa)
{
return root_hpa & PAGE_MASK;
diff --git a/arch/x86/kvm/vmx/spp.h b/arch/x86/kvm/vmx/spp.h
index 2b8f4e8d2267..94f6e39b30ed 100644
--- a/arch/x86/kvm/vmx/spp.h
+++ b/arch/x86/kvm/vmx/spp.h
@@ -2,6 +2,7 @@
#ifndef __KVM_X86_VMX_SPP_H
#define __KVM_X86_VMX_SPP_H

+#define FULL_SPP_ACCESS ((u32)((1ULL << 32) - 1))
bool is_spp_spte(struct kvm_mmu_page *sp);
inline u64 construct_spptp(unsigned long root_hpa);
int kvm_spp_setup_structure(struct kvm_vcpu *vcpu,
--
2.17.2
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