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1cfd4ccb30
First of all move PV-only ELF notes inside the XEN_PV conditional; note that - HV_START_LOW is dropped altogether, as it was meaningful for 32-bit PV only, - the 32-bit instance of VIRT_BASE is dropped, as it would be dead code once inside the conditional, - while PADDR_OFFSET is not exactly unused for PVH, it defaults to zero there, and the hypervisor (or tool stack) complains if it is present but VIRT_BASE isn't. Then have the "supported features" note actually report reality: All three of the features there are supported and/or applicable only in certain cases. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/f99bacc6-2a2f-41b0-5c0b-e01b7051cb07@suse.com Signed-off-by: Juergen Gross <jgross@suse.com>
125 lines
3.3 KiB
ArmAsm
125 lines
3.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/* Xen-specific pieces of head.S, intended to be included in the right
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place in head.S */
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#ifdef CONFIG_XEN
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#include <linux/elfnote.h>
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#include <linux/init.h>
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#include <asm/boot.h>
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#include <asm/asm.h>
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#include <asm/msr.h>
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#include <asm/page_types.h>
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#include <asm/percpu.h>
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#include <asm/unwind_hints.h>
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#include <xen/interface/elfnote.h>
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#include <xen/interface/features.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/xen-mca.h>
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#include <asm/xen/interface.h>
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.pushsection .noinstr.text, "ax"
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.balign PAGE_SIZE
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SYM_CODE_START(hypercall_page)
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.rept (PAGE_SIZE / 32)
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UNWIND_HINT_FUNC
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ANNOTATE_NOENDBR
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ANNOTATE_UNRET_SAFE
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ret
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/*
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* Xen will write the hypercall page, and sort out ENDBR.
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*/
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.skip 31, 0xcc
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.endr
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#define HYPERCALL(n) \
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.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
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.type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
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#include <asm/xen-hypercalls.h>
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#undef HYPERCALL
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SYM_CODE_END(hypercall_page)
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.popsection
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#ifdef CONFIG_XEN_PV
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__INIT
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SYM_CODE_START(startup_xen)
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UNWIND_HINT_END_OF_STACK
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ANNOTATE_NOENDBR
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cld
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leaq (__end_init_task - PTREGS_SIZE)(%rip), %rsp
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/* Set up %gs.
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*
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* The base of %gs always points to fixed_percpu_data. If the
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* stack protector canary is enabled, it is located at %gs:40.
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* Note that, on SMP, the boot cpu uses init data section until
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* the per cpu areas are set up.
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*/
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movl $MSR_GS_BASE,%ecx
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movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax
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cdq
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wrmsr
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mov %rsi, %rdi
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call xen_start_kernel
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SYM_CODE_END(startup_xen)
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__FINIT
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#ifdef CONFIG_XEN_PV_SMP
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.pushsection .text
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SYM_CODE_START(asm_cpu_bringup_and_idle)
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UNWIND_HINT_END_OF_STACK
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ENDBR
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call cpu_bringup_and_idle
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SYM_CODE_END(asm_cpu_bringup_and_idle)
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SYM_CODE_START(xen_cpu_bringup_again)
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UNWIND_HINT_FUNC
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mov %rdi, %rsp
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UNWIND_HINT_REGS
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call cpu_bringup_and_idle
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SYM_CODE_END(xen_cpu_bringup_again)
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.popsection
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#endif
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#endif
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
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ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
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#ifdef CONFIG_XEN_PV
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ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
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/* Map the p2m table to a 512GB-aligned user address. */
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ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD))
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ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
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ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables")
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ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
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ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
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.quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
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ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
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ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
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# define FEATURES_PV (1 << XENFEAT_writable_page_tables)
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#else
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# define FEATURES_PV 0
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#endif
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#ifdef CONFIG_XEN_PVH
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# define FEATURES_PVH (1 << XENFEAT_linux_rsdp_unrestricted)
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#else
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# define FEATURES_PVH 0
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#endif
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#ifdef CONFIG_XEN_DOM0
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# define FEATURES_DOM0 (1 << XENFEAT_dom0)
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#else
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# define FEATURES_DOM0 0
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#endif
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ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
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ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
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.long FEATURES_PV | FEATURES_PVH | FEATURES_DOM0)
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ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
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ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
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#endif /*CONFIG_XEN */
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