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Wed, 31 Jul 2024 13:00:34 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id z9SVEHI1qmbmWAAAD6G6ig (envelope-from ); Wed, 31 Jul 2024 13:00:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e00e31cd-4f3c-11ef-bc01-fd08da9f4363 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430834; 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=xFjXc7amrrMo+tzrt8XBmjjdTdsuxev2jTdhps3xh1w=; b=jB3dnJKbZKbnGEvuYJzIOGjksnvbL5bH40lwZN2/ZQcufdeCpsN7YPb4tsxDnyegrdMRef HiOyHmpSphiqH0wzgBTkc2niE3d4Bo9LgtVCiyRnSAq7EOqprBSLFIirzBUKLd6ugYesIY aoyM65PcQUam0CyzxIAEJr3iutjkdLI= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430834; 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=xFjXc7amrrMo+tzrt8XBmjjdTdsuxev2jTdhps3xh1w=; b=jB3dnJKbZKbnGEvuYJzIOGjksnvbL5bH40lwZN2/ZQcufdeCpsN7YPb4tsxDnyegrdMRef HiOyHmpSphiqH0wzgBTkc2niE3d4Bo9LgtVCiyRnSAq7EOqprBSLFIirzBUKLd6ugYesIY aoyM65PcQUam0CyzxIAEJr3iutjkdLI= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, wl@xen.org, Juergen Gross Subject: [PATCH 1/3] mini-os: mm: introduce generic page table walk function Date: Wed, 31 Jul 2024 15:00:24 +0200 Message-ID: <20240731130026.8467-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240731130026.8467-1-jgross@suse.com> References: <20240731130026.8467-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-2.60 / 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)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; 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)[]; RCPT_COUNT_FIVE(0.00)[5]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.60 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1722430851323116600 Content-Type: text/plain; charset="utf-8" In x86 mm code there are multiple instances of page table walks for different purposes. Introduce a generic page table walker being able to cover the current use cases. It will be used for other cases in future, too. The page table walker needs some per-level data, so add a table for that data. Merge it with the already existing pt_prot[] array. Rewrite get_pgt() to use the new walker. Signed-off-by: Juergen Gross --- arch/x86/mm.c | 152 +++++++++++++++++++++++++++++++++++++------------- 1 file changed, 113 insertions(+), 39 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 7ddf16e4..cc4d41e9 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -125,20 +125,25 @@ void arch_mm_preinit(void *p) } #endif =20 +static const struct { + unsigned int shift; + unsigned int entries; + pgentry_t prot; +} ptdata[PAGETABLE_LEVELS + 1] =3D { + { 0, 0, 0 }, + { L1_PAGETABLE_SHIFT, L1_PAGETABLE_ENTRIES, L1_PROT }, + { L2_PAGETABLE_SHIFT, L2_PAGETABLE_ENTRIES, L2_PROT }, + { L3_PAGETABLE_SHIFT, L3_PAGETABLE_ENTRIES, L3_PROT }, +#if defined(__x86_64__) + { L4_PAGETABLE_SHIFT, L4_PAGETABLE_ENTRIES, L4_PROT }, +#endif +}; + /* * Make pt_pfn a new 'level' page table frame and hook it into the page * table at offset in previous level MFN (pref_l_mfn). pt_pfn is a guest * PFN. */ -static pgentry_t pt_prot[PAGETABLE_LEVELS] =3D { - L1_PROT, - L2_PROT, - L3_PROT, -#if defined(__x86_64__) - L4_PROT, -#endif -}; - static void new_pt_frame(unsigned long *pt_pfn, unsigned long prev_l_mfn,=20 unsigned long offset, unsigned long level) { =20 @@ -170,7 +175,7 @@ static void new_pt_frame(unsigned long *pt_pfn, unsigne= d long prev_l_mfn, mmu_updates[0].ptr =3D (tab[l2_table_offset(pt_page)] & PAGE_MASK) +=20 sizeof(pgentry_t) * l1_table_offset(pt_page); mmu_updates[0].val =3D (pgentry_t)pfn_to_mfn(*pt_pfn) << PAGE_SHIFT |=20 - (pt_prot[level - 1] & ~_PAGE_RW); + (ptdata[level].prot & ~_PAGE_RW); =20 if ( (rc =3D HYPERVISOR_mmu_update(mmu_updates, 1, NULL, DOMID_SELF)) = < 0 ) { @@ -183,7 +188,7 @@ static void new_pt_frame(unsigned long *pt_pfn, unsigne= d long prev_l_mfn, mmu_updates[0].ptr =3D ((pgentry_t)prev_l_mfn << PAGE_SHIFT) + sizeof(pgentry_t) * offset; mmu_updates[0].val =3D (pgentry_t)pfn_to_mfn(*pt_pfn) << PAGE_SHIFT | - pt_prot[level]; + ptdata[level + 1].prot; =20 if ( (rc =3D HYPERVISOR_mmu_update(mmu_updates, 1, NULL, DOMID_SELF)) = < 0 )=20 { @@ -192,7 +197,7 @@ static void new_pt_frame(unsigned long *pt_pfn, unsigne= d long prev_l_mfn, } #else tab =3D mfn_to_virt(prev_l_mfn); - tab[offset] =3D (*pt_pfn << PAGE_SHIFT) | pt_prot[level]; + tab[offset] =3D (*pt_pfn << PAGE_SHIFT) | ptdata[level + 1].prot; #endif =20 *pt_pfn +=3D 1; @@ -202,6 +207,82 @@ static void new_pt_frame(unsigned long *pt_pfn, unsign= ed long prev_l_mfn, static mmu_update_t mmu_updates[L1_PAGETABLE_ENTRIES + 1]; #endif =20 +/* + * Walk recursively through all PTEs calling a specified function. The fun= ction + * is allowed to change the PTE, the walker will follow the new value. + * The walk will cover the virtual address range [from_va .. to_va]. + * The supplied function will be called with the following parameters: + * va: base virtual address of the area covered by the current PTE + * lvl: page table level of the PTE (1 =3D lowest level, PAGETABLE_LEVELS = =3D + * PTE in page table addressed by %cr3) + * is_leaf: true if PTE doesn't address another page table + * pte: address of the PTE + * par: parameter, passed to walk_pt() by caller + * Return value of func() being non-zero will terminate walk_pt(), walk_pt= () + * will return that value in this case, zero else. + */ +static int walk_pt(unsigned long from_va, unsigned long to_va, + int (func)(unsigned long va, unsigned int lvl, + bool is_leaf, pgentry_t *pte, void *par), + void *par) +{ + unsigned int lvl =3D PAGETABLE_LEVELS; + unsigned int ptindex[PAGETABLE_LEVELS + 1]; + unsigned long va =3D round_pgdown(from_va); + unsigned long va_lvl; + pgentry_t *tab[PAGETABLE_LEVELS + 1]; + pgentry_t *pte; + bool is_leaf; + int ret; + + /* Start at top level page table. */ + tab[lvl] =3D pt_base; + ptindex[lvl] =3D (va >> ptdata[lvl].shift) & (ptdata[lvl].entries - 1); + + while ( va < (to_va | (PAGE_SIZE - 1)) ) + { + pte =3D tab[lvl] + ptindex[lvl]; + is_leaf =3D (lvl =3D=3D L1_FRAME) || (*pte & _PAGE_PSE) || + !(*pte & _PAGE_PRESENT); + va_lvl =3D va & ~((1UL << ptdata[lvl].shift) - 1); + ret =3D func(va_lvl, lvl, is_leaf, pte, par); + if ( ret ) + return ret; + + /* PTE might have been modified by func(), reevaluate leaf state. = */ + is_leaf =3D (lvl =3D=3D L1_FRAME) || (*pte & _PAGE_PSE) || + !(*pte & _PAGE_PRESENT); + + if ( is_leaf ) + { + /* Reached a leaf PTE. Advance to next page. */ + va +=3D 1UL << ptdata[lvl].shift; + ptindex[lvl]++; + + /* Check for the need to traverse up again. */ + while ( ptindex[lvl] =3D=3D ptdata[lvl].entries ) + { + /* End of virtual address space? */ + if ( lvl =3D=3D PAGETABLE_LEVELS ) + return 0; + /* Reached end of current page table, one level up. */ + lvl++; + ptindex[lvl]++; + } + } + else + { + /* Not a leaf, walk one level down. */ + lvl--; + tab[lvl] =3D mfn_to_virt(pte_to_mfn(*pte)); + ptindex[lvl] =3D (va >> ptdata[lvl].shift) & + (ptdata[lvl].entries - 1); + } + } + + return 0; +} + /* * Build the initial pagetable. */ @@ -407,36 +488,29 @@ static void set_readonly(void *text, void *etext) /* * get the PTE for virtual address va if it exists. Otherwise NULL. */ -static pgentry_t *get_pgt(unsigned long va) +static int get_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, + pgentry_t *pte, void *par) { - unsigned long mfn; - pgentry_t *tab; - unsigned offset; + pgentry_t **result; =20 - tab =3D pt_base; - mfn =3D virt_to_mfn(pt_base); + if ( !(*pte & _PAGE_PRESENT) && lvl > L1_FRAME ) + return -1; =20 -#if defined(__x86_64__) - offset =3D l4_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) ) - return NULL; - mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(mfn); -#endif - offset =3D l3_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) ) - return NULL; - mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(mfn); - offset =3D l2_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) ) - return NULL; - if ( tab[offset] & _PAGE_PSE ) - return &tab[offset]; - mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(mfn); - offset =3D l1_table_offset(va); - return &tab[offset]; + if ( lvl > L1_FRAME && !(*pte & _PAGE_PSE) ) + return 0; + + result =3D par; + *result =3D pte; + + return 0; +} + +static pgentry_t *get_pgt(unsigned long va) +{ + pgentry_t *tab =3D NULL; + + walk_pt(va, va, get_pgt_func, &tab); + return tab; } =20 =20 --=20 2.43.0 From nobody Mon Nov 25 06:21:27 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1722430858; cv=none; d=zohomail.com; s=zohoarc; b=Jh+In2UwqgQD5waOACCEqe/2u0sJV+0WUn2eOjY7pnkGzga6Gk2S3AgSvcInZLb427wzu2DXXia53mNcK5nw5PIcihh0KxgHQNhr8tAcbsm8mE9bQOnNdn8gqa037CLgm4lo4JUPlvEApneGpnpbrUWrc0jwfv1Ay0ObR1ppNUE= ARC-Message-Signature: i=1; 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Wed, 31 Jul 2024 13:00:40 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id DA8ED13297; Wed, 31 Jul 2024 13:00:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MN3LM3c1qmb5WAAAD6G6ig (envelope-from ); Wed, 31 Jul 2024 13:00:39 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e35a8783-4f3c-11ef-bc01-fd08da9f4363 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430840; 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=YykKbfS2IJgdkLFFy5acGGcdbHS6FrMXXxAPIolzhxo=; b=kda6Ht6lVqFoJ4aXkKYbYjrHIHDfJufboK/HmgvGZMikS/y3QTjMtOYt8GD/q2mJ5gCKPz Vfqy3lygv1CAqPI7Xx+n3rSw3Bssy4VJHhEmy3zqfxbvMFFRp8G917U5bk+EYMmtwsViCH 4YQo/5C/eXy43bpjCoOTnyBarwyQ3NM= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430840; 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=YykKbfS2IJgdkLFFy5acGGcdbHS6FrMXXxAPIolzhxo=; b=kda6Ht6lVqFoJ4aXkKYbYjrHIHDfJufboK/HmgvGZMikS/y3QTjMtOYt8GD/q2mJ5gCKPz Vfqy3lygv1CAqPI7Xx+n3rSw3Bssy4VJHhEmy3zqfxbvMFFRp8G917U5bk+EYMmtwsViCH 4YQo/5C/eXy43bpjCoOTnyBarwyQ3NM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, wl@xen.org, Juergen Gross Subject: [PATCH 2/3] mini-os: mm: switch need_pgt() to use walk_pt() Date: Wed, 31 Jul 2024 15:00:25 +0200 Message-ID: <20240731130026.8467-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240731130026.8467-1-jgross@suse.com> References: <20240731130026.8467-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spamd-Result: default: False [-2.60 / 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)[]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; 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,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Score: -2.60 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1722430863883116600 Content-Type: text/plain; charset="utf-8" Instead of open coding a page table walk, use walk_pt() in need_pgt(). Signed-off-by: Juergen Gross --- arch/x86/mm.c | 66 +++++++++++++++++++-------------------------------- 1 file changed, 24 insertions(+), 42 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index cc4d41e9..accde291 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -518,57 +518,39 @@ static pgentry_t *get_pgt(unsigned long va) * return a valid PTE for a given virtual address. If PTE does not exist, * allocate page-table pages. */ -pgentry_t *need_pgt(unsigned long va) +static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, + pgentry_t *pte, void *par) { + pgentry_t **result =3D par; unsigned long pt_mfn; - pgentry_t *tab; unsigned long pt_pfn; - unsigned offset; + unsigned int idx; =20 - tab =3D pt_base; - pt_mfn =3D virt_to_mfn(pt_base); + if ( !is_leaf ) + return 0; =20 -#if defined(__x86_64__) - offset =3D l4_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) ) - { - pt_pfn =3D virt_to_pfn(alloc_page()); - if ( !pt_pfn ) - return NULL; - new_pt_frame(&pt_pfn, pt_mfn, offset, L3_FRAME); - } - ASSERT(tab[offset] & _PAGE_PRESENT); - pt_mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(pt_mfn); -#endif - offset =3D l3_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) )=20 - { - pt_pfn =3D virt_to_pfn(alloc_page()); - if ( !pt_pfn ) - return NULL; - new_pt_frame(&pt_pfn, pt_mfn, offset, L2_FRAME); - } - ASSERT(tab[offset] & _PAGE_PRESENT); - pt_mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(pt_mfn); - offset =3D l2_table_offset(va); - if ( !(tab[offset] & _PAGE_PRESENT) ) + if ( lvl =3D=3D L1_FRAME || (*pte & _PAGE_PRESENT) ) { - pt_pfn =3D virt_to_pfn(alloc_page()); - if ( !pt_pfn ) - return NULL; - new_pt_frame(&pt_pfn, pt_mfn, offset, L1_FRAME); + *result =3D pte; + return 1; } - ASSERT(tab[offset] & _PAGE_PRESENT); - if ( tab[offset] & _PAGE_PSE ) - return &tab[offset]; =20 - pt_mfn =3D pte_to_mfn(tab[offset]); - tab =3D mfn_to_virt(pt_mfn); + pt_mfn =3D virt_to_mfn(pte); + pt_pfn =3D virt_to_pfn(alloc_page()); + if ( !pt_pfn ) + return -1; + idx =3D (va >> ptdata[lvl].shift) & (ptdata[lvl].entries - 1); + new_pt_frame(&pt_pfn, pt_mfn, idx, lvl - 1); =20 - offset =3D l1_table_offset(va); - return &tab[offset]; + return 0; +} + +pgentry_t *need_pgt(unsigned long va) +{ + pgentry_t *tab =3D NULL; + + walk_pt(va, va, need_pgt_func, &tab); + return tab; } EXPORT_SYMBOL(need_pgt); =20 --=20 2.43.0 From nobody Mon Nov 25 06:21:27 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 31 Jul 2024 13:00:45 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e423661e-4f3c-11ef-8776-851b0ebba9a2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430845; 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=tSF1mgyyRozqIhqSscGGgmQznHAJUWT1VxHYxdygHx8=; b=AHTTS6nCUZ7FhXGl14JRg8q5Vm0NskVBAKF2Soyes8jqrhNIxBqB4rkOO4WDgPt3HRzlH4 jO5Y6gq+0kY//GsR2cfd6F0IdKzpAcg8UtKzru7NhXdvUTDnAUiYj73i7eUbp8hExOYVEk FOECsX7c4KBY/lHS+A8dlA2Ip83QIRU= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1722430845; 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=tSF1mgyyRozqIhqSscGGgmQznHAJUWT1VxHYxdygHx8=; b=AHTTS6nCUZ7FhXGl14JRg8q5Vm0NskVBAKF2Soyes8jqrhNIxBqB4rkOO4WDgPt3HRzlH4 jO5Y6gq+0kY//GsR2cfd6F0IdKzpAcg8UtKzru7NhXdvUTDnAUiYj73i7eUbp8hExOYVEk FOECsX7c4KBY/lHS+A8dlA2Ip83QIRU= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, wl@xen.org, Juergen Gross Subject: [PATCH 3/3] mini-os: mm: convert set_readonly() to use walk_pt() Date: Wed, 31 Jul 2024 15:00:26 +0200 Message-ID: <20240731130026.8467-4-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240731130026.8467-1-jgross@suse.com> References: <20240731130026.8467-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-2.60 / 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)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; 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)[]; RCPT_COUNT_FIVE(0.00)[5]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.60 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1722430866333116600 Content-Type: text/plain; charset="utf-8" Instead of having another copy of a page table walk in set_readonly(), just use walk_pt(). As it will be needed later anyway, split out the TLB flushing into a dedicated function. Signed-off-by: Juergen Gross --- arch/x86/mm.c | 119 +++++++++++++++++++++----------------------------- 1 file changed, 50 insertions(+), 69 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index accde291..90992068 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -397,92 +397,73 @@ static void build_pagetable(unsigned long *start_pfn,= unsigned long *max_pfn) * Mark portion of the address space read only. */ extern struct shared_info shared_info; -static void set_readonly(void *text, void *etext) -{ - unsigned long start_address =3D - ((unsigned long) text + PAGE_SIZE - 1) & PAGE_MASK; - unsigned long end_address =3D (unsigned long) etext; - pgentry_t *tab =3D pt_base, page; - unsigned long mfn =3D pfn_to_mfn(virt_to_pfn(pt_base)); - unsigned long offset; - unsigned long page_size =3D PAGE_SIZE; + +struct set_readonly_par { + unsigned long etext; #ifdef CONFIG_PARAVIRT - int count =3D 0; - int rc; + unsigned int count; #endif +}; =20 - printk("setting %p-%p readonly\n", text, etext); +static int set_readonly_func(unsigned long va, unsigned int lvl, bool is_l= eaf, + pgentry_t *pte, void *par) +{ + struct set_readonly_par *ro =3D par; =20 - while ( start_address + page_size <=3D end_address ) - { - tab =3D pt_base; - mfn =3D pfn_to_mfn(virt_to_pfn(pt_base)); + if ( !is_leaf ) + return 0; =20 -#if defined(__x86_64__) - offset =3D l4_table_offset(start_address); - page =3D tab[offset]; - mfn =3D pte_to_mfn(page); - tab =3D to_virt(mfn_to_pfn(mfn) << PAGE_SHIFT); -#endif - offset =3D l3_table_offset(start_address); - page =3D tab[offset]; - mfn =3D pte_to_mfn(page); - tab =3D to_virt(mfn_to_pfn(mfn) << PAGE_SHIFT); - offset =3D l2_table_offset(start_address); =20 - if ( !(tab[offset] & _PAGE_PSE) ) - { - page =3D tab[offset]; - mfn =3D pte_to_mfn(page); - tab =3D to_virt(mfn_to_pfn(mfn) << PAGE_SHIFT); + if ( va + (1UL << ptdata[lvl].shift) > ro->etext ) + return 1; =20 - offset =3D l1_table_offset(start_address); - } + if ( va =3D=3D (unsigned long)&shared_info ) + { + printk("skipped %lx\n", va); + return 0; + } =20 - if ( start_address !=3D (unsigned long)&shared_info ) - { #ifdef CONFIG_PARAVIRT - mmu_updates[count].ptr =3D=20 - ((pgentry_t)mfn << PAGE_SHIFT) + sizeof(pgentry_t) * offse= t; - mmu_updates[count].val =3D tab[offset] & ~_PAGE_RW; - count++; + mmu_updates[ro->count].ptr =3D virt_to_mach(pte); + mmu_updates[ro->count].val =3D *pte & ~_PAGE_RW; + ro->count++; + + if ( (ro->count =3D=3D L1_PAGETABLE_ENTRIES || + va + 2 * PAGE_SIZE > ro->etext) && + HYPERVISOR_mmu_update(mmu_updates, ro->count, NULL, DOMID_SELF) <= 0 ) + { + printk("ERROR: set_readonly(): PTE could not be updated\n"); + do_exit(); + } #else - tab[offset] &=3D ~_PAGE_RW; + *pte &=3D ~_PAGE_RW; #endif - } - else - printk("skipped %lx\n", start_address); =20 - start_address +=3D page_size; + return 0; +} =20 #ifdef CONFIG_PARAVIRT - if ( count =3D=3D L1_PAGETABLE_ENTRIES ||=20 - start_address + page_size > end_address ) - { - rc =3D HYPERVISOR_mmu_update(mmu_updates, count, NULL, DOMID_S= ELF); - if ( rc < 0 ) - { - printk("ERROR: set_readonly(): PTE could not be updated\n"= ); - do_exit(); - } - count =3D 0; - } -#else - if ( start_address =3D=3D (1UL << L2_PAGETABLE_SHIFT) ) - page_size =3D 1UL << L2_PAGETABLE_SHIFT; -#endif - } +static void tlb_flush(void) +{ + mmuext_op_t op =3D { .cmd =3D MMUEXT_TLB_FLUSH_ALL }; + int count; =20 -#ifdef CONFIG_PARAVIRT - { - mmuext_op_t op =3D { - .cmd =3D MMUEXT_TLB_FLUSH_ALL, - }; - int count; - HYPERVISOR_mmuext_op(&op, 1, &count, DOMID_SELF); - } + HYPERVISOR_mmuext_op(&op, 1, &count, DOMID_SELF); +} #else +static void tlb_flush(void) +{ write_cr3((unsigned long)pt_base); +} #endif + +static void set_readonly(void *text, void *etext) +{ + struct set_readonly_par setro =3D { .etext =3D (unsigned long)etext }; + unsigned long start_address =3D PAGE_ALIGN((unsigned long)text); + + printk("setting %p-%p readonly\n", text, etext); + walk_pt(start_address, setro.etext, set_readonly_func, &setro); + tlb_flush(); } =20 /* --=20 2.43.0