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dkim=pass header.d=suse.com header.s=susede1 header.b=GXDjXMGo DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063643; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=k/MeYSsGBJ27+vnobz1RvxbDTqVako7BAJOkWTQLl8E=; b=GXDjXMGo+0jyW1vB1crqi8s5c4HCfFeRis9b1zeJ45ctD3I/jEBpSePWxd+6dr05WO8bUM VEC11DAu0zCijo+VAjliNqxmux25hCpMVsyRzX9BKg1AZCzDfzQo0X5u7N+MYSqwgsPhF1 kfjYWesKAEyZNk9NLbamW9ewCBDyygM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 11/12] mini-os: kexec: add kexec callback functionality Date: Mon, 16 Jun 2025 10:46:18 +0200 Message-ID: <20250616084619.11112-12-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 53FAB21203 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; 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charset="utf-8" Add a kexec_call() macro which will provide the capability to register a function for being called when doing a kexec() call. The called functions will be called with a boolean parameter "undo" indicating whether a previous call needs to be undone due to a failure during kexec(). The related loop to call all callbacks is added to kexec(). Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/minios-x86.lds.S | 8 ++++++++ include/kexec.h | 6 ++++++ kexec.c | 13 +++++++++++++ 3 files changed, 27 insertions(+) diff --git a/arch/x86/minios-x86.lds.S b/arch/x86/minios-x86.lds.S index 8a1db7d4..8c6e0a60 100644 --- a/arch/x86/minios-x86.lds.S +++ b/arch/x86/minios-x86.lds.S @@ -58,6 +58,14 @@ SECTIONS } PROVIDE (__fini_array_end =3D .); =20 +#if defined(CONFIG_KEXEC) + PROVIDE (__kexec_array_start =3D .); + .kexec_array : { + *(.kexec_array) + } + PROVIDE (__kexec_array_end =3D .); +#endif + .ctors : { __CTOR_LIST__ =3D .; *(.ctors) diff --git a/include/kexec.h b/include/kexec.h index 411fa013..b89c3000 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -18,6 +18,12 @@ struct kexec_action { =20 extern char _kexec_start[], _kexec_end[]; extern struct kexec_action kexec_actions[KEXEC_MAX_ACTIONS]; +extern unsigned long __kexec_array_start[], __kexec_array_end[]; + +typedef int(*kexeccall_t)(bool undo); +#define kexec_call(func) = \ + static kexeccall_t __kexeccall_##func __attribute__((__used__)) = \ + __attribute__((__section__(".kexec_array"))) =3D fu= nc =20 extern unsigned long kexec_last_addr; =20 diff --git a/kexec.c b/kexec.c index 1ef7ce84..f42aa8ad 100644 --- a/kexec.c +++ b/kexec.c @@ -167,6 +167,7 @@ static int analyze_kernel(void *kernel, unsigned long s= ize) int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) { int ret; + unsigned long *func; =20 ret =3D analyze_kernel(kernel, kernel_size); if ( ret ) @@ -190,6 +191,18 @@ int kexec(void *kernel, unsigned long kernel_size, con= st char *cmdline) if ( ret ) goto err; =20 + for ( func =3D __kexec_array_start; func < __kexec_array_end; func++ ) + { + ret =3D ((kexeccall_t)(*func))(false); + if ( ret ) + { + for ( func--; func >=3D __kexec_array_start; func-- ) + ((kexeccall_t)(*func))(true); + + goto err; + } + } + /* Error exit. */ ret =3D ENOSYS; =20 --=20 2.43.0