From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f170.google.com (mail-yk0-f170.google.com [209.85.160.170]) by kanga.kvack.org (Postfix) with ESMTP id BD3F39003CC for ; Fri, 24 Jul 2015 07:48:20 -0400 (EDT) Received: by ykay190 with SMTP id y190so17318545yka.3 for ; Fri, 24 Jul 2015 04:48:20 -0700 (PDT) Received: from SMTP.CITRIX.COM (smtp.citrix.com. [66.165.176.89]) by mx.google.com with ESMTPS id m3si5893483ykc.3.2015.07.24.04.48.18 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 24 Jul 2015 04:48:18 -0700 (PDT) From: David Vrabel Subject: [PATCHv2 09/10] x86/xen: export xen_alloc_p2m_entry() Date: Fri, 24 Jul 2015 12:47:47 +0100 Message-ID: <1437738468-24110-10-git-send-email-david.vrabel@citrix.com> In-Reply-To: <1437738468-24110-1-git-send-email-david.vrabel@citrix.com> References: <1437738468-24110-1-git-send-email-david.vrabel@citrix.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: xen-devel@lists.xenproject.org Cc: David Vrabel , Konrad Rzeszutek Wilk , Boris Ostrovsky , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Daniel Kiper Rename alloc_p2m() to xen_alloc_p2m_entry() and export it. This is useful for ensuring that a p2m entry is allocated (i.e., not a shared missing or identity entry) so that subsequent set_phys_to_machine() calls will require no further allocations. Signed-off-by: David Vrabel --- arch/x86/include/asm/xen/page.h | 2 ++ arch/x86/xen/p2m.c | 16 ++++++++++------ 2 files changed, 12 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index c44a5d5..960b380 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -45,6 +45,8 @@ extern unsigned long *xen_p2m_addr; extern unsigned long xen_p2m_size; extern unsigned long xen_max_p2m_pfn; +extern int xen_alloc_p2m_entry(unsigned long pfn); + extern unsigned long get_phys_to_machine(unsigned long pfn); extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 8b7f18e..ef93ccf 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -503,7 +503,7 @@ static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg) * the new pages are installed with cmpxchg; if we lose the race then * simply free the page we allocated and use the one that's there. */ -static bool alloc_p2m(unsigned long pfn) +int xen_alloc_p2m_entry(unsigned long pfn) { unsigned topidx, mididx; unsigned long *top_mfn_p, *mid_mfn; @@ -524,7 +524,7 @@ static bool alloc_p2m(unsigned long pfn) /* PMD level is missing, allocate a new one */ ptep = alloc_p2m_pmd(addr, pte_pg); if (!ptep) - return false; + return -ENOMEM; } if (p2m_top_mfn) { @@ -541,7 +541,7 @@ static bool alloc_p2m(unsigned long pfn) mid_mfn = alloc_p2m_page(); if (!mid_mfn) - return false; + return -ENOMEM; p2m_mid_mfn_init(mid_mfn, p2m_missing); @@ -567,7 +567,7 @@ static bool alloc_p2m(unsigned long pfn) p2m = alloc_p2m_page(); if (!p2m) - return false; + return -ENOMEM; if (p2m_pfn == PFN_DOWN(__pa(p2m_missing))) p2m_init(p2m); @@ -590,8 +590,9 @@ static bool alloc_p2m(unsigned long pfn) free_p2m_page(p2m); } - return true; + return 0; } +EXPORT_SYMBOL(xen_alloc_p2m); unsigned long __init set_phys_range_identity(unsigned long pfn_s, unsigned long pfn_e) @@ -648,7 +649,10 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn) bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) { if (unlikely(!__set_phys_to_machine(pfn, mfn))) { - if (!alloc_p2m(pfn)) + int ret; + + ret = xen_alloc_p2m_entry(pfn); + if (ret < 0) return false; return __set_phys_to_machine(pfn, mfn); -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org