From patchwork Wed Sep 16 13:08:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11779733 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95C506CA for ; Wed, 16 Sep 2020 13:09:42 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5502922274 for ; Wed, 16 Sep 2020 13:09:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=suse.com header.i=@suse.com header.b="l8SoG9tE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5502922274 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kIXAy-0003ar-23; Wed, 16 Sep 2020 13:08:44 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kIXAw-0003aT-J8 for xen-devel@lists.xenproject.org; Wed, 16 Sep 2020 13:08:42 +0000 X-Inumbo-ID: 31c6b7a7-83c5-4253-81dc-744445b36ad8 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 31c6b7a7-83c5-4253-81dc-744445b36ad8; Wed, 16 Sep 2020 13:08:41 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=cantorsusede; t=1600261720; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LBtWaFEBZUGhu8aWD/XRiEveL+8Latdj2CST4lhLqjg=; b=l8SoG9tEs0g/Wx4szXqDO7hh3Rrcz/wJlouvgonOkhpVbTgKnSOpbdvc+P2Qx1MWm6h1qI wW3g0530iD3DP850coYwNvARp8nCf7uC+XNzRo/CRzIhqdV0i/+By7BPpVQar9aN+1/aS6 SBF5OLOf6qivj5W1ckzS5G5S5sdnfKMWhUFgQ4IhvN5Ato4gJp3p8gLeTdOTJE+03+Ttxt ET/UJAKStoCeR/Mp7g6dRJVWCXamv0acHT531XdF+RhiCqg9hkx5JYMAf5xzuqLyhCdj2t FlmhoAyICxJVZmDQfNh0CE71A7RExnZtbrCeoIzIPWTo8Mr/lf6l8isw1Uy0nQ== Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B9ADEAC85; Wed, 16 Sep 2020 13:08:55 +0000 (UTC) Subject: [PATCH v2 4/4] x86/shadow: refactor shadow_vram_{get,put}_l1e() From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , George Dunlap , Tim Deegan References: Message-ID: <51515581-19f3-5b7c-a2f9-1a0b11f8283a@suse.com> Date: Wed, 16 Sep 2020 15:08:40 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" By passing the functions an MFN and flags, only a single instance of each is needed; they were pretty large for being inline functions anyway. While moving the code, also adjust coding style and add const where sensible / possible. Signed-off-by: Jan Beulich --- v2: New. --- a/xen/arch/x86/mm/shadow/hvm.c +++ b/xen/arch/x86/mm/shadow/hvm.c @@ -903,6 +903,104 @@ int shadow_track_dirty_vram(struct domai return rc; } +void shadow_vram_get_mfn(mfn_t mfn, unsigned int l1f, + mfn_t sl1mfn, const void *sl1e, + const struct domain *d) +{ + unsigned long gfn; + struct sh_dirty_vram *dirty_vram = d->arch.hvm.dirty_vram; + + ASSERT(is_hvm_domain(d)); + + if ( !dirty_vram /* tracking disabled? */ || + !(l1f & _PAGE_RW) /* read-only mapping? */ || + !mfn_valid(mfn) /* mfn can be invalid in mmio_direct */) + return; + + gfn = gfn_x(mfn_to_gfn(d, mfn)); + /* Page sharing not supported on shadow PTs */ + BUG_ON(SHARED_M2P(gfn)); + + if ( (gfn >= dirty_vram->begin_pfn) && (gfn < dirty_vram->end_pfn) ) + { + unsigned long i = gfn - dirty_vram->begin_pfn; + const struct page_info *page = mfn_to_page(mfn); + + if ( (page->u.inuse.type_info & PGT_count_mask) == 1 ) + /* Initial guest reference, record it */ + dirty_vram->sl1ma[i] = mfn_to_maddr(sl1mfn) | + PAGE_OFFSET(sl1e); + } +} + +void shadow_vram_put_mfn(mfn_t mfn, unsigned int l1f, + mfn_t sl1mfn, const void *sl1e, + const struct domain *d) +{ + unsigned long gfn; + struct sh_dirty_vram *dirty_vram = d->arch.hvm.dirty_vram; + + ASSERT(is_hvm_domain(d)); + + if ( !dirty_vram /* tracking disabled? */ || + !(l1f & _PAGE_RW) /* read-only mapping? */ || + !mfn_valid(mfn) /* mfn can be invalid in mmio_direct */) + return; + + gfn = gfn_x(mfn_to_gfn(d, mfn)); + /* Page sharing not supported on shadow PTs */ + BUG_ON(SHARED_M2P(gfn)); + + if ( (gfn >= dirty_vram->begin_pfn) && (gfn < dirty_vram->end_pfn) ) + { + unsigned long i = gfn - dirty_vram->begin_pfn; + const struct page_info *page = mfn_to_page(mfn); + bool dirty = false; + paddr_t sl1ma = mfn_to_maddr(sl1mfn) | PAGE_OFFSET(sl1e); + + if ( (page->u.inuse.type_info & PGT_count_mask) == 1 ) + { + /* Last reference */ + if ( dirty_vram->sl1ma[i] == INVALID_PADDR ) + { + /* We didn't know it was that one, let's say it is dirty */ + dirty = true; + } + else + { + ASSERT(dirty_vram->sl1ma[i] == sl1ma); + dirty_vram->sl1ma[i] = INVALID_PADDR; + if ( l1f & _PAGE_DIRTY ) + dirty = true; + } + } + else + { + /* We had more than one reference, just consider the page dirty. */ + dirty = true; + /* Check that it's not the one we recorded. */ + if ( dirty_vram->sl1ma[i] == sl1ma ) + { + /* Too bad, we remembered the wrong one... */ + dirty_vram->sl1ma[i] = INVALID_PADDR; + } + else + { + /* + * Ok, our recorded sl1e is still pointing to this page, let's + * just hope it will remain. + */ + } + } + + if ( dirty ) + { + dirty_vram->dirty_bitmap[i / 8] |= 1 << (i % 8); + dirty_vram->last_dirty = NOW(); + } + } +} + /* * Local variables: * mode: C --- a/xen/arch/x86/mm/shadow/multi.c +++ b/xen/arch/x86/mm/shadow/multi.c @@ -1047,107 +1047,6 @@ static int shadow_set_l2e(struct domain return flags; } -static inline void shadow_vram_get_l1e(shadow_l1e_t new_sl1e, - shadow_l1e_t *sl1e, - mfn_t sl1mfn, - struct domain *d) -{ -#ifdef CONFIG_HVM - mfn_t mfn = shadow_l1e_get_mfn(new_sl1e); - int flags = shadow_l1e_get_flags(new_sl1e); - unsigned long gfn; - struct sh_dirty_vram *dirty_vram = d->arch.hvm.dirty_vram; - - if ( !is_hvm_domain(d) || !dirty_vram /* tracking disabled? */ - || !(flags & _PAGE_RW) /* read-only mapping? */ - || !mfn_valid(mfn) ) /* mfn can be invalid in mmio_direct */ - return; - - gfn = gfn_x(mfn_to_gfn(d, mfn)); - /* Page sharing not supported on shadow PTs */ - BUG_ON(SHARED_M2P(gfn)); - - if ( (gfn >= dirty_vram->begin_pfn) && (gfn < dirty_vram->end_pfn) ) - { - unsigned long i = gfn - dirty_vram->begin_pfn; - struct page_info *page = mfn_to_page(mfn); - - if ( (page->u.inuse.type_info & PGT_count_mask) == 1 ) - /* Initial guest reference, record it */ - dirty_vram->sl1ma[i] = mfn_to_maddr(sl1mfn) - | ((unsigned long)sl1e & ~PAGE_MASK); - } -#endif -} - -static inline void shadow_vram_put_l1e(shadow_l1e_t old_sl1e, - shadow_l1e_t *sl1e, - mfn_t sl1mfn, - struct domain *d) -{ -#ifdef CONFIG_HVM - mfn_t mfn = shadow_l1e_get_mfn(old_sl1e); - int flags = shadow_l1e_get_flags(old_sl1e); - unsigned long gfn; - struct sh_dirty_vram *dirty_vram = d->arch.hvm.dirty_vram; - - if ( !is_hvm_domain(d) || !dirty_vram /* tracking disabled? */ - || !(flags & _PAGE_RW) /* read-only mapping? */ - || !mfn_valid(mfn) ) /* mfn can be invalid in mmio_direct */ - return; - - gfn = gfn_x(mfn_to_gfn(d, mfn)); - /* Page sharing not supported on shadow PTs */ - BUG_ON(SHARED_M2P(gfn)); - - if ( (gfn >= dirty_vram->begin_pfn) && (gfn < dirty_vram->end_pfn) ) - { - unsigned long i = gfn - dirty_vram->begin_pfn; - struct page_info *page = mfn_to_page(mfn); - int dirty = 0; - paddr_t sl1ma = mfn_to_maddr(sl1mfn) - | ((unsigned long)sl1e & ~PAGE_MASK); - - if ( (page->u.inuse.type_info & PGT_count_mask) == 1 ) - { - /* Last reference */ - if ( dirty_vram->sl1ma[i] == INVALID_PADDR ) { - /* We didn't know it was that one, let's say it is dirty */ - dirty = 1; - } - else - { - ASSERT(dirty_vram->sl1ma[i] == sl1ma); - dirty_vram->sl1ma[i] = INVALID_PADDR; - if ( flags & _PAGE_DIRTY ) - dirty = 1; - } - } - else - { - /* We had more than one reference, just consider the page dirty. */ - dirty = 1; - /* Check that it's not the one we recorded. */ - if ( dirty_vram->sl1ma[i] == sl1ma ) - { - /* Too bad, we remembered the wrong one... */ - dirty_vram->sl1ma[i] = INVALID_PADDR; - } - else - { - /* Ok, our recorded sl1e is still pointing to this page, let's - * just hope it will remain. */ - } - } - if ( dirty ) - { - dirty_vram->dirty_bitmap[i / 8] |= 1 << (i % 8); - dirty_vram->last_dirty = NOW(); - } - } -#endif -} - static int shadow_set_l1e(struct domain *d, shadow_l1e_t *sl1e, shadow_l1e_t new_sl1e, @@ -1156,6 +1055,7 @@ static int shadow_set_l1e(struct domain { int flags = 0; shadow_l1e_t old_sl1e; + unsigned int old_sl1f; #if SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC mfn_t new_gmfn = shadow_l1e_get_mfn(new_sl1e); #endif @@ -1194,7 +1094,9 @@ static int shadow_set_l1e(struct domain new_sl1e = shadow_l1e_flip_flags(new_sl1e, rc); /* fall through */ case 0: - shadow_vram_get_l1e(new_sl1e, sl1e, sl1mfn, d); + shadow_vram_get_mfn(shadow_l1e_get_mfn(new_sl1e), + shadow_l1e_get_flags(new_sl1e), + sl1mfn, sl1e, d); break; } #undef PAGE_FLIPPABLE @@ -1205,20 +1107,19 @@ static int shadow_set_l1e(struct domain shadow_write_entries(sl1e, &new_sl1e, 1, sl1mfn); flags |= SHADOW_SET_CHANGED; - if ( (shadow_l1e_get_flags(old_sl1e) & _PAGE_PRESENT) - && !sh_l1e_is_magic(old_sl1e) ) + old_sl1f = shadow_l1e_get_flags(old_sl1e); + if ( (old_sl1f & _PAGE_PRESENT) && !sh_l1e_is_magic(old_sl1e) && + shadow_mode_refcounts(d) ) { /* We lost a reference to an old mfn. */ /* N.B. Unlike higher-level sets, never need an extra flush * when writing an l1e. Because it points to the same guest frame * as the guest l1e did, it's the guest's responsibility to * trigger a flush later. */ - if ( shadow_mode_refcounts(d) ) - { - shadow_vram_put_l1e(old_sl1e, sl1e, sl1mfn, d); - shadow_put_page_from_l1e(old_sl1e, d); - TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SHADOW_L1_PUT_REF); - } + shadow_vram_put_mfn(shadow_l1e_get_mfn(old_sl1e), old_sl1f, + sl1mfn, sl1e, d); + shadow_put_page_from_l1e(old_sl1e, d); + TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SHADOW_L1_PUT_REF); } return flags; } @@ -1944,9 +1845,12 @@ void sh_destroy_l1_shadow(struct domain /* Decrement refcounts of all the old entries */ mfn_t sl1mfn = smfn; SHADOW_FOREACH_L1E(sl1mfn, sl1e, 0, 0, { - if ( (shadow_l1e_get_flags(*sl1e) & _PAGE_PRESENT) - && !sh_l1e_is_magic(*sl1e) ) { - shadow_vram_put_l1e(*sl1e, sl1e, sl1mfn, d); + unsigned int sl1f = shadow_l1e_get_flags(*sl1e); + + if ( (sl1f & _PAGE_PRESENT) && !sh_l1e_is_magic(*sl1e) ) + { + shadow_vram_put_mfn(shadow_l1e_get_mfn(*sl1e), sl1f, + sl1mfn, sl1e, d); shadow_put_page_from_l1e(*sl1e, d); } }); --- a/xen/arch/x86/mm/shadow/private.h +++ b/xen/arch/x86/mm/shadow/private.h @@ -410,6 +410,14 @@ void shadow_update_paging_modes(struct v * With user_only == 1, unhooks only the user-mode mappings. */ void shadow_unhook_mappings(struct domain *d, mfn_t smfn, int user_only); +/* VRAM dirty tracking helpers. */ +void shadow_vram_get_mfn(mfn_t mfn, unsigned int l1f, + mfn_t sl1mfn, const void *sl1e, + const struct domain *d); +void shadow_vram_put_mfn(mfn_t mfn, unsigned int l1f, + mfn_t sl1mfn, const void *sl1e, + const struct domain *d); + #if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC) /* Allow a shadowed page to go out of sync */ int sh_unsync(struct vcpu *v, mfn_t gmfn);