From patchwork Fri Jun 25 23:25:06 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 108184 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o5PNPr6j001638 for ; Fri, 25 Jun 2010 23:25:53 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755742Ab0FYXZt (ORCPT ); Fri, 25 Jun 2010 19:25:49 -0400 Received: from cantor.suse.de ([195.135.220.2]:41350 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755891Ab0FYXZR (ORCPT ); Fri, 25 Jun 2010 19:25:17 -0400 Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.221.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.suse.de (Postfix) with ESMTP id 339B393F46; Sat, 26 Jun 2010 01:25:15 +0200 (CEST) From: Alexander Graf To: kvm-ppc@vger.kernel.org Cc: KVM list , linuxppc-dev Subject: [PATCH 18/26] KVM: PPC: KVM PV guest stubs Date: Sat, 26 Jun 2010 01:25:06 +0200 Message-Id: <1277508314-915-19-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1277508314-915-1-git-send-email-agraf@suse.de> References: <1277508314-915-1-git-send-email-agraf@suse.de> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 25 Jun 2010 23:25:53 +0000 (UTC) diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 2d8dd73..d873bc6 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -32,3 +32,62 @@ #define KVM_MAGIC_PAGE (-4096L) #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) +static bool kvm_patching_worked = true; + +static void kvm_map_magic_page(void *data) +{ + kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE, + KVM_MAGIC_PAGE, /* Physical Address */ + KVM_MAGIC_PAGE); /* Effective Address */ +} + +static void kvm_check_ins(u32 *inst) +{ + u32 _inst = *inst; + u32 inst_no_rt = _inst & ~KVM_MASK_RT; + u32 inst_rt = _inst & KVM_MASK_RT; + + switch (inst_no_rt) { + } + + switch (_inst) { + } + + flush_icache_range((ulong)inst, (ulong)inst + 4); +} + +static void kvm_use_magic_page(void) +{ + u32 *p; + u32 *start, *end; + + /* Tell the host to map the magic page to -4096 on all CPUs */ + + on_each_cpu(kvm_map_magic_page, NULL, 1); + + /* Now loop through all code and find instructions */ + + start = (void*)_stext; + end = (void*)_etext; + + for (p = start; p < end; p++) + kvm_check_ins(p); +} + +static int __init kvm_guest_init(void) +{ + char *p; + + if (!kvm_para_available()) + return 0; + + if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) + kvm_use_magic_page(); + + printk(KERN_INFO "KVM: Live patching for a fast VM %s\n", + kvm_patching_worked ? "worked" : "failed"); + + return 0; +} + +postcore_initcall(kvm_guest_init);