From patchwork Wed Jul 13 06:32:31 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 970722 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p6D6V7cG003109 for ; Wed, 13 Jul 2011 06:31:07 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964957Ab1GMGam (ORCPT ); Wed, 13 Jul 2011 02:30:42 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:58655 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S964930Ab1GMGam (ORCPT ); Wed, 13 Jul 2011 02:30:42 -0400 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id C2BFE170149; Wed, 13 Jul 2011 14:30:34 +0800 (CST) Received: from mailserver.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id p6D6UXjI030534; Wed, 13 Jul 2011 14:30:34 +0800 Received: from localhost.localdomain ([10.167.225.99]) by mailserver.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.1FP4) with ESMTP id 2011071314295059-818240 ; Wed, 13 Jul 2011 14:29:50 +0800 Message-ID: <4E1D3BFF.6000505@cn.fujitsu.com> Date: Wed, 13 Jul 2011 14:32:31 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , LKML , KVM Subject: [PATCH 3/3] KVM: x86: cleanup the code of read/write emulation References: <4E1D3BAC.5090109@cn.fujitsu.com> In-Reply-To: <4E1D3BAC.5090109@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-07-13 14:29:50, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-07-13 14:29:50, Serialize complete at 2011-07-13 14:29:50 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-4.2.6 (demeter2.kernel.org [140.211.167.43]); Wed, 13 Jul 2011 06:31:07 +0000 (UTC) Using the read/write operation to remove the same code Signed-off-by: Xiao Guangrong --- arch/x86/kvm/x86.c | 146 ++++++++++++++++------------------------------------ 1 files changed, 45 insertions(+), 101 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f5c60a8..2b76ae3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4045,85 +4045,6 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, return 0; } -static int emulator_read_emulated_onepage(unsigned long addr, - void *val, - unsigned int bytes, - struct x86_exception *exception, - struct kvm_vcpu *vcpu) -{ - gpa_t gpa; - int handled, ret; - - if (vcpu->mmio_read_completed) { - memcpy(val, vcpu->mmio_data, bytes); - trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, - vcpu->mmio_phys_addr, *(u64 *)val); - vcpu->mmio_read_completed = 0; - return X86EMUL_CONTINUE; - } - - ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, false); - - if (ret < 0) - return X86EMUL_PROPAGATE_FAULT; - - if (ret) - goto mmio; - - if (!kvm_read_guest(vcpu->kvm, gpa, val, bytes)) - return X86EMUL_CONTINUE; - -mmio: - /* - * Is this MMIO handled locally? - */ - handled = vcpu_mmio_read(vcpu, gpa, bytes, val); - - if (handled == bytes) - return X86EMUL_CONTINUE; - - gpa += handled; - bytes -= handled; - val += handled; - - trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0); - - vcpu->mmio_needed = 1; - vcpu->run->exit_reason = KVM_EXIT_MMIO; - vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa; - vcpu->mmio_size = bytes; - vcpu->run->mmio.len = min(vcpu->mmio_size, 8); - vcpu->run->mmio.is_write = vcpu->mmio_is_write = 0; - vcpu->mmio_index = 0; - - return X86EMUL_IO_NEEDED; -} - -static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, - unsigned long addr, - void *val, - unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - /* Crossing a page boundary? */ - if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { - int rc, now; - - now = -addr & ~PAGE_MASK; - rc = emulator_read_emulated_onepage(addr, val, now, exception, - vcpu); - if (rc != X86EMUL_CONTINUE) - return rc; - addr += now; - val += now; - bytes -= now; - } - return emulator_read_emulated_onepage(addr, val, bytes, exception, - vcpu); -} - int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, const void *val, int bytes) { @@ -4208,16 +4129,21 @@ static struct read_write_emulator_ops write_emultor = { .write = true, }; -static int emulator_write_emulated_onepage(unsigned long addr, - const void *val, - unsigned int bytes, - struct x86_exception *exception, - struct kvm_vcpu *vcpu) +static int emulator_read_write_onepage(unsigned long addr, void *val, + unsigned int bytes, + struct x86_exception *exception, + struct kvm_vcpu *vcpu, + struct read_write_emulator_ops *ops) { gpa_t gpa; int handled, ret; + bool write = ops->write; + + if (ops->read_write_prepare && + ops->read_write_prepare(vcpu, val, bytes)) + return X86EMUL_CONTINUE; - ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, true); + ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); if (ret < 0) return X86EMUL_PROPAGATE_FAULT; @@ -4226,15 +4152,14 @@ static int emulator_write_emulated_onepage(unsigned long addr, if (ret) goto mmio; - if (emulator_write_phys(vcpu, gpa, val, bytes)) + if (ops->read_write_emulate(vcpu, gpa, val, bytes)) return X86EMUL_CONTINUE; mmio: - trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val); /* * Is this MMIO handled locally? */ - handled = vcpu_mmio_write(vcpu, gpa, bytes, val); + handled = ops->read_write_mmio(vcpu, gpa, bytes, val); if (handled == bytes) return X86EMUL_CONTINUE; @@ -4243,23 +4168,20 @@ mmio: val += handled; vcpu->mmio_needed = 1; - memcpy(vcpu->mmio_data, val, bytes); vcpu->run->exit_reason = KVM_EXIT_MMIO; vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; vcpu->run->mmio.len = min(vcpu->mmio_size, 8); - vcpu->run->mmio.is_write = vcpu->mmio_is_write = 1; - memcpy(vcpu->run->mmio.data, vcpu->mmio_data, 8); + vcpu->run->mmio.is_write = vcpu->mmio_is_write = write; vcpu->mmio_index = 0; - return X86EMUL_CONTINUE; + return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); } -int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, - unsigned long addr, - const void *val, - unsigned int bytes, - struct x86_exception *exception) +int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr, + void *val, unsigned int bytes, + struct x86_exception *exception, + struct read_write_emulator_ops *ops) { struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); @@ -4268,16 +4190,38 @@ int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, int rc, now; now = -addr & ~PAGE_MASK; - rc = emulator_write_emulated_onepage(addr, val, now, exception, - vcpu); + rc = emulator_read_write_onepage(addr, val, now, exception, + vcpu, ops); + if (rc != X86EMUL_CONTINUE) return rc; addr += now; val += now; bytes -= now; } - return emulator_write_emulated_onepage(addr, val, bytes, exception, - vcpu); + + return emulator_read_write_onepage(addr, val, bytes, exception, + vcpu, ops); +} + +static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, + unsigned long addr, + void *val, + unsigned int bytes, + struct x86_exception *exception) +{ + return emulator_read_write(ctxt, addr, val, bytes, + exception, &read_emultor); +} + +int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, + unsigned long addr, + const void *val, + unsigned int bytes, + struct x86_exception *exception) +{ + return emulator_read_write(ctxt, addr, (void *)val, bytes, + exception, &write_emultor); } #define CMPXCHG_TYPE(t, ptr, old, new) \