Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932244Ab3COP2b (ORCPT ); Fri, 15 Mar 2013 11:28:31 -0400 Received: from e28smtp06.in.ibm.com ([122.248.162.6]:49765 "EHLO e28smtp06.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755465Ab3COP23 (ORCPT ); Fri, 15 Mar 2013 11:28:29 -0400 Message-ID: <51433E13.4000306@linux.vnet.ibm.com> Date: Fri, 15 Mar 2013 23:28:19 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Xiao Guangrong CC: Marcelo Tosatti , Gleb Natapov , LKML , KVM Subject: [PATCH 3/5] KVM: MMU: retain more available bits available on mmio spte References: <51433D98.4050605@linux.vnet.ibm.com> In-Reply-To: <51433D98.4050605@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13031515-9574-0000-0000-0000070B0A49 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1810 Lines: 53 Let mmio spte only use bit62 and bit63 on upper 32 bits, then bit 52 ~ bit 61 can be used for other purposes Signed-off-by: Xiao Guangrong --- arch/x86/kvm/vmx.c | 4 ++-- arch/x86/kvm/x86.c | 8 +++++++- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 17a6938..54fdb76 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4003,10 +4003,10 @@ static void ept_set_mmio_spte_mask(void) /* * EPT Misconfigurations can be generated if the value of bits 2:0 * of an EPT paging-structure entry is 110b (write/execute). - * Also, magic bits (0xffull << 49) is set to quickly identify mmio + * Also, magic bits (0x3ull << 62) is set to quickly identify mmio * spte. */ - kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull); + kvm_mmu_set_mmio_spte_mask((0x3ull << 62) | 0x6ull); } /* diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 61a5bb6..81fb3c3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5197,7 +5197,13 @@ static void kvm_set_mmio_spte_mask(void) * Set the reserved bits and the present bit of an paging-structure * entry to generate page fault with PFER.RSV = 1. */ - mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr; + /* Mask the reserved physical address bits. */ + mask = ((1ull << (51 - maxphyaddr + 1)) - 1) << maxphyaddr; + + /* Bit 62 is always reserved for 32bit host. */ + mask |= 0x3ull << 62; + + /* Set the present bit. */ mask |= 1ull; #ifdef CONFIG_X86_64 -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/