[Hygon][6.6][Feature]: KVM: backport guest memory from v6.8 to OLK-6.6 · Pull Request !18709 · openEuler/kernel

**Backport KVM feature - guest memory from v6.8 to OLK-6.6**

**Issue**
#ID4I2Z 
[OLK-6.6]

**About the patches** 
[If the introduction below is not enough, go read https://lwn.net/SubscriberLink/949277/118520c1248ace63/ and subscribe to LWN]

Introduce several new KVM uAPIs to ultimately create a guest-first memory subsystem within KVM, a.k.a. guest_memfd.  Guest-first memory allows KVM to provide features, enhancements, and optimizations that are kludgly or outright impossible to implement in a generic memory subsystem.

There are 34 commits from upstream for this feature:
```
5d74316466f4 KVM: selftests: Add a memory region subtest to validate invalid flags
e3577788de64 KVM: selftests: Test KVM exit behavior for private memory/access
8a89efd43423 KVM: selftests: Add basic selftest for guest_memfd()
2feabb855df8 KVM: selftests: Expand set_memory_region_test to validate guest_memfd()
e6f4f345b259 KVM: selftests: Add KVM_SET_USER_MEMORY_REGION2 helper
43f623f350ce KVM: selftests: Add x86-only selftest for private memory conversions
242331dfc495 KVM: selftests: Add GUEST_SYNC[1-6] macros for synchronizing more data
672eaa351015 KVM: selftests: Introduce VM "shape" to allow tests to specify the VM type
01244fce2fa2 KVM: selftests: Add helpers to do KVM_HC_MAP_GPA_RANGE hypercalls (x86)
f7fa67495d11 KVM: selftests: Add helpers to convert guest memory b/w private and shared
bb2968ad6c33 KVM: selftests: Add support for creating private memslots
8d99e347c097 KVM: selftests: Convert lib's mem regions to KVM_SET_USER_MEMORY_REGION2
335869c3f2b8 KVM: selftests: Drop unused kvm_userspace_memory_region_find() helper
89ea60c2c7b5 KVM: x86: Add support for "protected VMs" that can utilize private memory
eed52e434bc3 KVM: Allow arch code to track number of memslot address spaces per VM
2333afa17af0 KVM: Drop superfluous __KVM_VCPU_MULTIPLE_ADDRESS_SPACE macro
8dd2eee9d526 KVM: x86/mmu: Handle page fault for private memory
90b4fe17981e KVM: x86: Disallow hugepages when memory attributes are mixed
ee605e315633 KVM: x86: "Reset" vcpu->run->exit_reason early in KVM_RUN
a7800aa80ea4 KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory
4f0b9194bc11 fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()
0003e2a41468 mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
5a475554db1e KVM: Introduce per-page memory attributes
193bbfaacc84 KVM: Drop .on_unlock() mmu_notifier hook
cec29eef0a81 KVM: Add a dedicated mmu_notifier flag for reclaiming freed memory
16f95f3b95ca KVM: Add KVM_EXIT_MEMORY_FAULT exit to report faults to userspace
bb58b90b1a8f KVM: Introduce KVM_SET_USER_MEMORY_REGION2
f128cf8cfbec KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER
4a2e993faad3 KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU
1853d7502a19 KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER
d497a0fab8b8 KVM: WARN if there are dangling MMU invalidations at VM destruction
8569992d64b8 KVM: Use gfn instead of hva for mmu_notifier_retry
c0db19232c1e KVM: Assert that mmu_invalidate_in_progress *never* goes negative
e97b39c5c436 KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges
```

Below 18 commits are dependent bugfix backport from upstream:
```
7f06e3aa2e83 mm/mprotect: push mmu notifier to PUDs
945bdae20be5 KVM: selftests: fix unintentional noop test in guest_memfd_test.c
9aef71c892a5 KVM: Explicitly mark KVM_GUEST_MEMFD as depending on KVM_GENERIC_MMU_NOTIFIER
9129633d568e KVM: x86/mmu: Prevent installing hugepages when mem attributes are changing
47bb584237cc KVM: Allow CPU to reschedule while setting per-page memory attributes
2098acaf2445 KVM: fix documentation for KVM_CREATE_GUEST_MEMFD
992b54bd083c KVM: x86/mmu: x86: Don't overflow lpage_info when checking attributes
44f42ef37deb KVM: x86/mmu: Move private vs. shared check above slot validity checks
d02c357e5bfa KVM: x86/mmu: Retry fault before acquiring mmu_lock if mapping is changing
e9da6f08edb0 KVM: selftests: Explicitly close guest_memfd files in some gmem tests
63e5c5a10559 KVM: selftests: Create GUEST_MEMFD for relevant invalid flags testcases
e563592224e0 KVM: Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY
e30dca91e566 tools headers UAPI: Sync kvm headers with the kernel sources
614f362918c7 LoongArch: KVM: Fix build due to API changes
c31745d2c508 virt: guest_memfd: fix reference leak on hwpoisoned page
80583d0cfd8f KVM: guest-memfd: fix unused-function warning
e9e60c82fe39 selftests/kvm: fix compilation on non-x86_64 platforms
ae431059e75d KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying
```
The last two commits are fixing the kABI breakage.
```
KVM: x86: fix KVM kABI breakage due to adding the vm_type field into struct kvm_arch
KVM: fix KVM kABI breakage for the changes in KVM common structures
```

**Test** 
Test on x86 Platform
- Built and run the kernel successfully
- Kernel kselftest/kvm: No new failures
- Newly added kernel kselftest/kvm/guest_memfd_test: Passed
- Newly added kernel kselftest/kvm/x86_64/private_mem_conversions_test: Passed
- Newly added kernel kselftest/kvm/x86_64/private_mem_kvm_exits_test: Passed

**Known Issue** 
N/A

**Default config change** 
N/A

**Reference** 
[[PATCH v14 00/34] KVM: guest_memfd() and per-page attributes](https://lore.kernel.org/all/20231105163040.14904-1-pbonzini@redhat.com/#t)

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