From mboxrd@z Thu Jan 1 00:00:00 1970 From: vijay.kilari@gmail.com Subject: [RFC PATCH v2 10/22] xen/arm: Add helper function to get domain page Date: Thu, 19 Mar 2015 20:07:57 +0530 Message-ID: <1426775889-29442-11-git-send-email-vijay.kilari@gmail.com> References: <1426775889-29442-1-git-send-email-vijay.kilari@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1426775889-29442-1-git-send-email-vijay.kilari@gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian.Campbell@citrix.com, julien.grall@linaro.org, stefano.stabellini@eu.citrix.com, stefano.stabellini@citrix.com, tim@xen.org, xen-devel@lists.xen.org Cc: Prasun.Kapoor@caviumnetworks.com, Vijaya Kumar K , manish.jaggi@caviumnetworks.com, vijay.kilari@gmail.com List-Id: xen-devel@lists.xenproject.org From: Vijaya Kumar K Given the physical address of the page, get the maddr to map in Xen to access domain's memory. Signed-off-by: Vijaya Kumar K --- xen/arch/arm/p2m.c | 24 ++++++++++++++++++++++++ xen/include/asm-arm/p2m.h | 3 +++ 2 files changed, 27 insertions(+) diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c index 8809f5a..b19c5e9 100644 --- a/xen/arch/arm/p2m.c +++ b/xen/arch/arm/p2m.c @@ -1152,6 +1152,30 @@ unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn) return p >> PAGE_SHIFT; } +struct page_info *get_page_from_paddr(struct domain *d, paddr_t paddr, + unsigned long flags) +{ + struct p2m_domain *p2m = &d->arch.p2m; + struct page_info *page = NULL; + + ASSERT(d == current->domain); + + spin_lock(&p2m->lock); + + if ( !mfn_valid(paddr >> PAGE_SHIFT) ) + goto err; + + page = mfn_to_page(paddr >> PAGE_SHIFT); + ASSERT(page); + + if ( unlikely(!get_page(page, d)) ) + page = NULL; + +err: + spin_unlock(&p2m->lock); + return page; +} + struct page_info *get_page_from_gva(struct domain *d, vaddr_t va, unsigned long flags) { diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index da36504..7947e1b 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -147,6 +147,9 @@ void guest_physmap_remove_page(struct domain *d, unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn); +struct page_info *get_page_from_paddr(struct domain *d, paddr_t paddr, + unsigned long flags); + /* * Populate-on-demand */ -- 1.7.9.5