From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.suse.de (cantor.suse.de [195.135.220.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx1.suse.de", Issuer "CAcert Class 3 Root" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 40B621008EA for ; Sat, 26 Jun 2010 09:25:23 +1000 (EST) From: Alexander Graf To: kvm-ppc@vger.kernel.org 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> In-Reply-To: <1277508314-915-1-git-send-email-agraf@suse.de> References: <1277508314-915-1-git-send-email-agraf@suse.de> Cc: linuxppc-dev , KVM list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , We will soon start and replace instructions from the text section with other, paravirtualized versions. To ease the readability of those patches I split out the generic looping and magic page mapping code out. This patch still only contains stubs. But at least it loops through the text section :). Signed-off-by: Alexander Graf --- arch/powerpc/kernel/kvm.c | 59 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 59 insertions(+), 0 deletions(-) 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); -- 1.6.0.2