Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754744AbZKWOLD (ORCPT ); Mon, 23 Nov 2009 09:11:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754288AbZKWOLA (ORCPT ); Mon, 23 Nov 2009 09:11:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:14195 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754166AbZKWOJe (ORCPT ); Mon, 23 Nov 2009 09:09:34 -0500 From: Gleb Natapov To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, avi@redhat.com, mingo@elte.hu, a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com, riel@redhat.com Subject: [PATCH v2 02/12] Add PV MSR to enable asynchronous page faults delivery. Date: Mon, 23 Nov 2009 16:05:57 +0200 Message-Id: <1258985167-29178-3-git-send-email-gleb@redhat.com> In-Reply-To: <1258985167-29178-1-git-send-email-gleb@redhat.com> References: <1258985167-29178-1-git-send-email-gleb@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4384 Lines: 155 Signed-off-by: Gleb Natapov --- arch/x86/include/asm/kvm_host.h | 3 ++ arch/x86/include/asm/kvm_para.h | 2 + arch/x86/kvm/x86.c | 42 +++++++++++++++++++++++++++++++++++++- include/linux/kvm.h | 1 + 4 files changed, 46 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 06e0856..9598e85 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -374,6 +374,9 @@ struct kvm_vcpu_arch { /* used for guest single stepping over the given code position */ u16 singlestep_cs; unsigned long singlestep_rip; + + u32 __user *apf_data; + u64 apf_msr_val; }; struct kvm_mem_alias { diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 5f580f2..222d5fd 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -15,9 +15,11 @@ #define KVM_FEATURE_CLOCKSOURCE 0 #define KVM_FEATURE_NOP_IO_DELAY 1 #define KVM_FEATURE_MMU_OP 2 +#define KVM_FEATURE_ASYNC_PF 3 #define MSR_KVM_WALL_CLOCK 0x11 #define MSR_KVM_SYSTEM_TIME 0x12 +#define MSR_KVM_ASYNC_PF_EN 0x13 #define KVM_MAX_MMU_OP_BATCH 32 diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 35eea30..ce8e66d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -566,9 +566,9 @@ static inline u32 bit(int bitno) * kvm-specific. Those are put in the beginning of the list. */ -#define KVM_SAVE_MSRS_BEGIN 2 +#define KVM_SAVE_MSRS_BEGIN 3 static u32 msrs_to_save[] = { - MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, + MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, MSR_KVM_ASYNC_PF_EN, MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, MSR_K6_STAR, #ifdef CONFIG_X86_64 @@ -949,6 +949,26 @@ out: return r; } +static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) +{ + u64 gpa = data & ~0x3f; + int offset = offset_in_page(gpa); + unsigned long addr; + + addr = gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT); + if (kvm_is_error_hva(addr)) + return 1; + + vcpu->arch.apf_data = (u32 __user*)(addr + offset); + + /* check if address is mapped */ + if (get_user(offset, vcpu->arch.apf_data)) { + vcpu->arch.apf_data = NULL; + return 1; + } + return 0; +} + int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) { switch (msr) { @@ -1029,6 +1049,14 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) kvm_request_guest_time_update(vcpu); break; } + case MSR_KVM_ASYNC_PF_EN: + vcpu->arch.apf_msr_val = data; + if (data & 1) { + if (kvm_pv_enable_async_pf(vcpu, data)) + return 1; + } else + vcpu->arch.apf_data = NULL; + break; case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: @@ -1221,6 +1249,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) case MSR_KVM_SYSTEM_TIME: data = vcpu->arch.time; break; + case MSR_KVM_ASYNC_PF_EN: + data = vcpu->arch.apf_msr_val; + break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: @@ -1343,6 +1374,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_XEN_HVM: case KVM_CAP_ADJUST_CLOCK: case KVM_CAP_VCPU_EVENTS: + case KVM_CAP_ASYNC_PF: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -4965,6 +4997,9 @@ free_vcpu: void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { + vcpu->arch.apf_data = NULL; + vcpu->arch.apf_msr_val = 0; + vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); @@ -4982,6 +5017,9 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) vcpu->arch.dr6 = DR6_FIXED_1; vcpu->arch.dr7 = DR7_FIXED_1; + vcpu->arch.apf_data = NULL; + vcpu->arch.apf_msr_val = 0; + return kvm_x86_ops->vcpu_reset(vcpu); } diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 92045a9..6af1c99 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -492,6 +492,7 @@ struct kvm_ioeventfd { #ifdef __KVM_HAVE_VCPU_EVENTS #define KVM_CAP_VCPU_EVENTS 41 #endif +#define KVM_CAP_ASYNC_PF 42 #ifdef KVM_CAP_IRQ_ROUTING -- 1.6.5 -- 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/