Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753489AbbGOTbn (ORCPT ); Wed, 15 Jul 2015 15:31:43 -0400 Received: from mga09.intel.com ([134.134.136.24]:33939 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753402AbbGOTbY (ORCPT ); Wed, 15 Jul 2015 15:31:24 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,482,1432623600"; d="scan'208";a="748017420" From: Xiao Guangrong To: pbonzini@redhat.com Cc: gleb@kernel.org, mtosatti@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, alex.williamson@redhat.com, bsd@redhat.com, lersek@redhat.com, jordan.l.justen@intel.com, edk2-devel@lists.sourceforge.net, Xiao Guangrong Subject: [PATCH 3/3] KVM: x86: quirkily apply WB to all memory if cache is disabled Date: Thu, 16 Jul 2015 03:25:56 +0800 Message-Id: <1436988356-4565-3-git-send-email-guangrong.xiao@linux.intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1436988356-4565-1-git-send-email-guangrong.xiao@linux.intel.com> References: <1436988356-4565-1-git-send-email-guangrong.xiao@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4231 Lines: 122 From: Xiao Guangrong Current firmware depends on WB to fast boot, please refer to https://lkml.org/lkml/2015/7/12/115 Let's us WB if CR0.CD is set to make this kind of firmware happy This quirk can be dropped by using KVM_ENABLE_CAP API with KVM_CAP_DISABLE_QUIRKS if the broken firmware is gone Signed-off-by: Xiao Guangrong --- arch/x86/include/uapi/asm/kvm.h | 1 + arch/x86/kvm/lapic.c | 2 +- arch/x86/kvm/svm.c | 2 +- arch/x86/kvm/vmx.c | 5 ++++- arch/x86/kvm/x86.c | 7 +++++++ arch/x86/kvm/x86.h | 5 +++++ 6 files changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index a4ae82e..2f141d4 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -356,5 +356,6 @@ struct kvm_sync_regs { #define KVM_QUIRK_LINT0_REENABLED (1 << 0) #define KVM_QUIRK_CD_NW_CLEARED (1 << 1) +#define KVM_QUIRK_CD_AS_WB (1 << 2) #endif /* _ASM_X86_KVM_H */ diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 954e98a..0d77b20 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1595,7 +1595,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event) for (i = 0; i < APIC_LVT_NUM; i++) apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED); apic_update_lvtt(apic); - if (!(vcpu->kvm->arch.disabled_quirks & KVM_QUIRK_LINT0_REENABLED)) + if (!kvm_check_disabled_quirks(vcpu->kvm, KVM_QUIRK_LINT0_REENABLED)) apic_set_reg(apic, APIC_LVT0, SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT)); apic_manage_nmi_watchdog(apic, kvm_apic_get_reg(apic, APIC_LVT0)); diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index bbc678a..cac9ee6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1672,7 +1672,7 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) * does not do it - this results in some delay at * reboot */ - if (!(vcpu->kvm->arch.disabled_quirks & KVM_QUIRK_CD_NW_CLEARED)) + if (!kvm_check_disabled_quirks(vcpu->kvm, KVM_QUIRK_CD_NW_CLEARED)) cr0 &= ~(X86_CR0_CD | X86_CR0_NW); svm->vmcb->save.cr0 = cr0; mark_dirty(svm->vmcb, VMCB_CR); diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d342b23..74398db 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8703,7 +8703,10 @@ static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) if (kvm_read_cr0(vcpu) & X86_CR0_CD) { ipat = VMX_EPT_IPAT_BIT; - cache = MTRR_TYPE_UNCACHABLE; + if (kvm_check_disabled_quirks(vcpu->kvm, KVM_QUIRK_CD_AS_WB)) + cache = MTRR_TYPE_WRBACK; + else + cache = MTRR_TYPE_UNCACHABLE; goto exit; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 28076c2..fd21712 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3575,6 +3575,11 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, return r; } +static void kvm_init_disabled_quirks(struct kvm *kvm) +{ + kvm->arch.disabled_quirks = KVM_QUIRK_CD_AS_WB; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -7422,6 +7427,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn); INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn); + kvm_init_disabled_quirks(kvm); + return 0; } diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index c04b56b..ea99928 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -152,6 +152,11 @@ static inline u64 get_kernel_ns(void) return ktime_get_boot_ns(); } +static inline bool kvm_check_disabled_quirks(struct kvm *kvm, u64 quirk) +{ + return !!(kvm->arch.disabled_quirks & quirk); +} + void kvm_before_handle_nmi(struct kvm_vcpu *vcpu); void kvm_after_handle_nmi(struct kvm_vcpu *vcpu); void kvm_set_pending_timer(struct kvm_vcpu *vcpu); -- 2.1.0 -- 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/