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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063620; 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=fyowQBL0+KxczJ3QgQBuNM66VYPd6WBeOp+F4jmgKk4=; b=b8TE957bRIDX2dKj2D4qCqXjot6zF2lhHmjCjRiwyB9XpopFzubXSiXK8jpJthg5yFsgrA yHw/6RvRm5L75cgVyPPBpVKIpW/tNqKH6H/6o1Ct0d25D+ny7ImtKuSfGrDwA+OnZ6JyvK aJvjIyol4usendyS26lfrJa4TZf3ii0= 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 07/12] mini-os: kexec: build parameters for new kernel Date: Mon, 16 Jun 2025 10:46:14 +0200 Message-ID: <20250616084619.11112-8-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-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid,imap1.dmz-prg2.suse.org:helo,amd.com:email] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 X-ZohoMail-DKIM: pass (identity @suse.com) (identity @suse.com) X-ZM-MESSAGEID: 1750063867811116600 Content-Type: text/plain; charset="utf-8" Build the parameters for the new kernel, consisting of the hvm_start_info struct, the memory map and the command line. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ include/kexec.h | 4 ++++ kexec.c | 13 ++++++++++- 3 files changed, 74 insertions(+), 1 deletion(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 47830905..fc58473e 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -199,6 +199,7 @@ bool kexec_arch_need_analyze_shdrs(void) =20 static unsigned long kexec_param_loc; static unsigned int kexec_param_size; +static unsigned long kexec_param_mem; =20 void kexec_set_param_loc(const char *cmdline) { @@ -211,4 +212,61 @@ void kexec_set_param_loc(const char *cmdline) kexec_last_addr +=3D kexec_param_size; kexec_last_addr =3D round_pgup(kexec_last_addr); } + +int kexec_get_entry(const char *cmdline) +{ + struct hvm_start_info *info; + struct hvm_memmap_table_entry *mmap; + unsigned int order; + unsigned int i; + + if ( kernel_phys_entry =3D=3D ~0UL ) + return ENOEXEC; + + order =3D get_order(kexec_param_size); + + kexec_param_mem =3D alloc_pages(order); + if ( !kexec_param_mem ) + return ENOMEM; + + info =3D (struct hvm_start_info *)kexec_param_mem; + memset(info, 0, sizeof(*info)); + info->magic =3D XEN_HVM_START_MAGIC_VALUE; + info->version =3D 1; + info->cmdline_paddr =3D kexec_param_mem + sizeof(*info) + + e820_entries * sizeof(struct hvm_memmap_table_en= try); + info->memmap_paddr =3D kexec_param_mem + sizeof(*info); + info->memmap_entries =3D e820_entries; + + mmap =3D (struct hvm_memmap_table_entry *)(info + 1); + for ( i =3D 0; i < e820_entries; i++ ) + { + mmap->addr =3D e820_map[i].addr; + mmap->size =3D e820_map[i].size; + mmap->type =3D e820_map[i].type; + mmap++; + } + + strcpy((char *)mmap, cmdline); + + if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_loc), info, + kexec_param_size) ) + return ENOSPC; + + /* The call of the new kernel happens via the physical address! */ + if ( kexec_add_action(KEXEC_CALL, (void *)kernel_phys_entry, + (void *)kexec_param_loc, 0) ) + return ENOSPC; + + return 0; +} + +void kexec_get_entry_undo(void) +{ + if ( kexec_param_mem ) + { + free_pages((void *)kexec_param_mem, get_order(kexec_param_size)); + kexec_param_mem =3D 0; + } +} #endif /* CONFIG_KEXEC */ diff --git a/include/kexec.h b/include/kexec.h index 8a2b552f..7b103dea 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -45,4 +45,8 @@ bool kexec_arch_need_analyze_shdrs(void); /* Finalize parameter location and size. */ void kexec_set_param_loc(const char *cmdline); =20 +/* Get entry point and parameter of new kernel. */ +int kexec_get_entry(const char *cmdline); +void kexec_get_entry_undo(void); + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index 1a90d8ab..e762fbeb 100644 --- a/kexec.c +++ b/kexec.c @@ -176,10 +176,21 @@ int kexec(void *kernel, unsigned long kernel_size, co= nst char *cmdline) =20 reserve_memory_below(kexec_last_addr); =20 + ret =3D kexec_get_entry(cmdline); + if ( ret ) + { + printk("kexec: ELF file of new kernel has no valid entry point\n"); + goto err; + } + /* Error exit. */ + ret =3D ENOSYS; + + err: unreserve_memory_below(); + kexec_get_entry_undo(); =20 - return ENOSYS; + return ret; } EXPORT_SYMBOL(kexec); =20 --=20 2.43.0