xen: update to RELEASE-4.20.1-tip

Bumping xen to version RELEASE-4.20.1-40-gae992e68d3, which comprises the following commits:

    ae992e68d3 CI: Create initrd fragments explicitly as root
    d7e55a4139 Arm: adjust locking in p2m_get_page_from_gfn()
    1230b94f1c Arm: foreign page handling in p2m_get_page_from_gfn()
    665a641471 x86/viridian: protect concurrent modification of the reference TSC page
    c5ecaf0200 x86/viridian: avoid NULL pointer dereference in viridian_synic_deliver_timer_msg()
    5f83f721fb x86/viridian: avoid NULL pointer dereference in update_reference_tsc()
    c59a69ae9e x86/gen-cpuid: Fix debugging for cycle detection
    24fef7a86f x86/gen-cpuid: correct cycle detection
    eb1dc440b2 xen/efi: Fix crash with initial empty EFI options
    9eb436c461 hvmloader: fix SMBIOS table length checks
    68f5ecf690 tools: add sizeof_field and endof_field macros
    1541866d47 x86/suspend: unconditionally raise a timer softirq on resume
    96b7183a02 x86/mce: Adjustments to intel_init_ppin()
    a98591e217 x86/iommu: setup MMCFG ahead of IOMMU
    cb827d8317 x86/hvm/ioreq: Fix condition in hvm_alloc_legacy_ioreq_gfn()
    e2590544d5 x86/mkelf32: pad load segment to 2Mb boundary
    16dae1e1cf efi: Call FreePages() only if needed
    67fcd2d2e5 x86/hpet: do local APIC EOI after interrupt processing
    ea5025554e xenalyze: correct symbol name length fscanf() specifier
    7cda6b6509 tools/xl: don't crash on NULL command line
    4072b0b24c xen/arinc653: fix delay in the start of major frame
    ec5752e154 xen/credit2: factor in previous active unit's credit in csched2_runtime()
    2fd3628fa6 x86/svm: Always flush TLB using TLB_CTRL_FLUSH_ALL
    f1f2ac1a63 x86/alternatives: serialize after (self-)modifying code
    69568ab306 x86/S3: don't lose previously collected CPU data (AMD extra)
    73eaac394c x86/idle: Fix the C6 eoi_errata[] list to include NEHALEM_EX
    c7f876c993 x86/ept: batch PML p2m type-changes into single locked region
    c75f3aea50 x86/ept: move vmx_domain_flush_pml_buffers() to p2m-ept.c
    a586e3865a x86/S3: don't lose previously collected CPU data
    36a83978c5 x86/SMP: guard socket_cpumask[] access in cpu_smpboot_free()
    758879c019 x86emul: adjust BSF/BSR/LZCNT/TZCNT behavior as to EFLAGS
    60186d6f5f x86/mwait-idle: add Clearwater Forest SoC support
    76281c34cd x86/mwait-idle: add Granite Rapids Xeon D support
    1345e24869 x86/mwait-idle: add Granite Rapids Xeon support
    a634a48b48 x86/mwait-idle: add Sierra Forest SoC support
    a4dd64ea81 x86/mwait-idle: add Grand Ridge SoC support
    733dd65888 x86/mwait-idle: Add Meteorlake support
    53939e22c2 x86/mwait-idle: add Emerald Rapids Xeon support
    6d0b94a461 x86/mwait-idle: Add AlderLake-N support
    faf408249c update Xen version to 4.20.2-pre
    08f043965a update Xen version to 4.20.1
    4f0dc6c643 x86/idle: undo use of MONITOR/MWAIT mnemonics
    138d403e07 x86/spec-ctrl: Mitigate Transitive Scheduler Attacks
    05b991100e x86/idle: Rearrange VERW and MONITOR in mwait_idle_with_hints()
    be1e30b45d x86/ucode: Digests for TSA microcode
    67dda84795 x86/cpu-policy: Infrastructure for CPUID leaf 0x80000021.ecx
    88c8875c9d x86/cpu-policy: Rearrange guest_common_*_feature_adjustments()
    349c70a391 x86/idle: Fix buggy "x86/mwait-idle: enable interrupts before C1 on Xeons"
    13d09b2f12 x86/idle: Implement a new MWAIT IPI-elision algorithm
    1a51c6252a xen/softirq: Rework arch_skip_send_event_check() into arch_set_softirq()
    3f11eda311 x86/idle: Convert force_mwait_ipi_wakeup to X86_BUG_MONITOR
    d6727b7e25 x86/idle: Drop incorrect smp_mb() in mwait_idle_with_hints()
    f5dd06f9b1 x86/idle: Remove broken MWAIT implementation
    60522d4040 x86/cpu-policy: Simplify logic in guest_common_default_feature_adjustments()
    b6436bb005 Revert part of "x86/mwait-idle: disable IBRS during long idle"
    8869f66d29 x86/idle: Remove MFENCEs for CLFLUSH_MONITOR
    fa254938f0 x86/idle: Move monitor()/mwait() wrappers into cpu-idle.c
    0c70d44453 x86/cpu-policy: Fix handling of leaf 0x80000021
    703e42cd87 xen/build: pass -fzero-init-padding-bits=all to gcc15
    74e66f34f9 libxc/PM: Retry get_pxstat if data is incomplete
    f448bc1074 libxc/PM: Ensure pxstat buffers are correctly sized
    9e1309b0f0 x86/emul: Fix extable registration in invoke_stub()
    2f80f3071a xenalyze: Add 2 missed VCPUOPs in vcpu_op_str
    fd64f59cc7 cpufreq: Avoid potential buffer overrun and leak
    110bc6ef1a x86/pmstat: Check size of PMSTAT_get_pxstat buffers
    0cd774e8c2 tools/libxl: Only access legacy altp2m on HVM
    60f6137190 x86/pv: Fix breakpoint reporting
    ed3bf0a89b x86/vmx: Fix VMEntry failure on ADL/SPR with shadow guests
    5919917921 x86/vpci: fix handling of BAR overlaps with non-hole regions
    a60e953080 x86/pv: fix emulation of wb{,no}invd to flush all pCPU caches
    ddec00769c x86/emul: Fix emulation of RDSEED with older toolchains
    612cfd7215 x86/IRQ: constrain creator-domain-ID assertion
    ee150f56fc x86/pv: fix MMUEXT_FLUSH_CACHE to flush all pCPU caches
    f938c08494 x86/spec-ctrl: Support Intel's new PB-OPT
    b1eeea44cd cpufreq: don't leave stale statistics pointer
    68506161ef x86emul: avoid UB shifts in FLDENV/FRSTOR handling
    d58800f13d xen/link: Include .debug_str_offsets in DWARF2_DEBUG_SECTIONS
    45056fe5c5 x86/spec-ctrl: Synthesise ITS_NO to guests on unaffected hardware
    b9e8204ab1 x86/thunk: Build Xen with Return Thunks
    cda26aed40 x86/stubs: Introduce place_ret() to abstract away raw 0xc3's
    c6a2b5e9d0 x86/thunk: (Mis)align the RETs in clear_bhb_loops() to mitigate ITS
    f81f44393f x86/thunk: (Mis)align __x86_indirect_thunk_* to mitigate ITS
    5992d3ab9f x86/guest: Remove use of the Xen hypercall_page
    cf81888012 x86/alternative: Support replacements when a feature is not present
    47d911f69e CI: Build with --prefix=/usr rather than setting LD_LIBRARY_PATH

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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