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x86/xen: fix memblock_reserve() usage on PVH

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The current usage of memblock_reserve() in init_pvh_bootparams() is done before
the .bss is zeroed, and that used to be fine when
memblock_reserved_init_regions implicitly ended up in the .meminit.data
section.  However after commit 73db3abdca memblock_reserved_init_regions
ends up in the .bss section, thus breaking it's usage before the .bss is
cleared.

Move and rename the call to xen_reserve_extra_memory() so it's done in the
x86_init.oem.arch_setup hook, which gets executed after the .bss has been
zeroed, but before calling e820__memory_setup().

Fixes: 73db3abdca ("init/modpost: conditionally check section mismatch to __meminit*")
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Message-ID: <20240725073116.14626-3-roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Roger Pau Monne 2024-07-25 09:31:15 +02:00 committed by Juergen Gross
parent fc05ea89c9
commit 4c00673489
3 changed files with 12 additions and 11 deletions
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5
arch/x86/include/asm/xen/hypervisor.h
View file

@ -62,11 +62,6 @@ void xen_arch_unregister_cpu(int num);
#ifdef CONFIG_PVH
void __init xen_pvh_init(struct boot_params *boot_params);
void __init mem_map_via_hcall(struct boot_params *boot_params_p);
#ifdef CONFIG_XEN_PVH
void __init xen_reserve_extra_memory(struct boot_params *bootp);
#else
static inline void xen_reserve_extra_memory(struct boot_params *bootp) { }
#endif
#endif
/* Lazy mode for batching updates / context switch */

3
arch/x86/platform/pvh/enlighten.c
View file

@ -75,9 +75,6 @@ static void __init init_pvh_bootparams(bool xen_guest)
} else
xen_raw_printk("Warning: Can fit ISA range into e820\n");
if (xen_guest)
xen_reserve_extra_memory(&pvh_bootparams);
pvh_bootparams.hdr.cmd_line_ptr =
pvh_start_info.cmdline_paddr;

15
arch/x86/xen/enlighten_pvh.c
View file

@ -9,6 +9,7 @@
#include <asm/io_apic.h>
#include <asm/hypervisor.h>
#include <asm/e820/api.h>
#include <asm/setup.h>
#include <xen/xen.h>
#include <asm/xen/interface.h>
@ -41,8 +42,9 @@ EXPORT_SYMBOL_GPL(xen_pvh);
* hypervisor should notify us which memory ranges are suitable for creating
* foreign mappings, but that's not yet implemented.
*/
void __init xen_reserve_extra_memory(struct boot_params *bootp)
static void __init pvh_reserve_extra_memory(void)
{
struct boot_params *bootp = &boot_params;
unsigned int i, ram_pages = 0, extra_pages;
for (i = 0; i < bootp->e820_entries; i++) {
@ -94,6 +96,14 @@ void __init xen_reserve_extra_memory(struct boot_params *bootp)
}
}
static void __init pvh_arch_setup(void)
{
pvh_reserve_extra_memory();
if (xen_initial_domain())
xen_add_preferred_consoles();
}
void __init xen_pvh_init(struct boot_params *boot_params)
{
u32 msr;
@ -107,8 +117,7 @@ void __init xen_pvh_init(struct boot_params *boot_params)
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
if (xen_initial_domain())
x86_init.oem.arch_setup = xen_add_preferred_consoles;
x86_init.oem.arch_setup = pvh_arch_setup;
x86_init.oem.banner = xen_banner;
xen_efi_init(boot_params);