From patchwork Thu Dec 21 14:02:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yang, Weijiang" X-Patchwork-Id: 13501452 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 231AA5788A; Thu, 21 Dec 2023 09:03:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cf2wEis5" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703149436; x=1734685436; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=LMZ9WqVy19AK6b6saLJ6FfZQNW3F536pCoX8lK5esR8=; b=cf2wEis5AnaungqbO7Gii8n5ljVukR0UcTi8PhdWbK/zi2Qj/sYqF301 2wPlQnIy8n6wzD2smDsmxOsIwTlteJDheM/ZJuexxVYk66qgSoAKAFU58 9MoETWVFlhSMRwSpsdAmKCE6tDUOJf0RHUU03vdEqW5xnoHN53djZrUbo EwR9X9C+nrfqXkkJDq9y75lM/azHDGfcrIk8++IuhCdRRKPeopV4wMYYC 8OJbxFrNOklpmCfRNiNy9SRxeHyZVKfkjsd3vkKi7RrrPoGyl67LjE4Lq ukxSzBKMsbbibtZflogh+csepZ1im6trUMc5gPDjRoo0q7ZLxDM4T2KgW g==; X-IronPort-AV: E=McAfee;i="6600,9927,10930"; a="398729711" X-IronPort-AV: E=Sophos;i="6.04,293,1695711600"; d="scan'208";a="398729711" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2023 01:03:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10930"; a="900028609" X-IronPort-AV: E=Sophos;i="6.04,293,1695711600"; d="scan'208";a="900028609" Received: from 984fee00a5ca.jf.intel.com (HELO embargo.jf.intel.com) ([10.165.9.183]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2023 01:03:11 -0800 From: Yang Weijiang To: seanjc@google.com, pbonzini@redhat.com, dave.hansen@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: peterz@infradead.org, chao.gao@intel.com, rick.p.edgecombe@intel.com, mlevitsk@redhat.com, john.allen@amd.com, weijiang.yang@intel.com Subject: [PATCH v8 15/26] KVM: x86: Load guest FPU state when access XSAVE-managed MSRs Date: Thu, 21 Dec 2023 09:02:28 -0500 Message-Id: <20231221140239.4349-16-weijiang.yang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20231221140239.4349-1-weijiang.yang@intel.com> References: <20231221140239.4349-1-weijiang.yang@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Sean Christopherson Load the guest's FPU state if userspace is accessing MSRs whose values are managed by XSAVES. Introduce two helpers, kvm_{get,set}_xstate_msr(), to facilitate access to such kind of MSRs. If MSRs supported in kvm_caps.supported_xss are passed through to guest, the guest MSRs are swapped with host's before vCPU exits to userspace and after it reenters kernel before next VM-entry. Because the modified code is also used for the KVM_GET_MSRS device ioctl(), explicitly check @vcpu is non-null before attempting to load guest state. The XSAVE-managed MSRs cannot be retrieved via the device ioctl() without loading guest FPU state (which doesn't exist). Note that guest_cpuid_has() is not queried as host userspace is allowed to access MSRs that have not been exposed to the guest, e.g. it might do KVM_SET_MSRS prior to KVM_SET_CPUID2. The two helpers are put here in order to manifest accessing xsave-managed MSRs requires special check and handling to guarantee the correctness of read/write to the MSRs. Signed-off-by: Sean Christopherson Co-developed-by: Yang Weijiang Signed-off-by: Yang Weijiang Reviewed-by: Maxim Levitsky --- arch/x86/kvm/x86.c | 35 ++++++++++++++++++++++++++++++++++- arch/x86/kvm/x86.h | 24 ++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f50c5a523b92..bde780ae69bf 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -133,6 +133,9 @@ static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2); static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2); static DEFINE_MUTEX(vendor_module_lock); +static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu); +static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu); + struct kvm_x86_ops kvm_x86_ops __read_mostly; #define KVM_X86_OP(func) \ @@ -4509,6 +4512,21 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) } EXPORT_SYMBOL_GPL(kvm_get_msr_common); +/* + * Returns true if the MSR in question is managed via XSTATE, i.e. is context + * switched with the rest of guest FPU state. + */ +static bool is_xstate_managed_msr(u32 index) +{ + switch (index) { + case MSR_IA32_U_CET: + case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP: + return true; + default: + return false; + } +} + /* * Read or write a bunch of msrs. All parameters are kernel addresses. * @@ -4519,11 +4537,26 @@ static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, int (*do_msr)(struct kvm_vcpu *vcpu, unsigned index, u64 *data)) { + bool fpu_loaded = false; int i; - for (i = 0; i < msrs->nmsrs; ++i) + for (i = 0; i < msrs->nmsrs; ++i) { + /* + * If userspace is accessing one or more XSTATE-managed MSRs, + * temporarily load the guest's FPU state so that the guest's + * MSR value(s) is resident in hardware, i.e. so that KVM can + * get/set the MSR via RDMSR/WRMSR. + */ + if (vcpu && !fpu_loaded && kvm_caps.supported_xss && + is_xstate_managed_msr(entries[i].index)) { + kvm_load_guest_fpu(vcpu); + fpu_loaded = true; + } if (do_msr(vcpu, entries[i].index, &entries[i].data)) break; + } + if (fpu_loaded) + kvm_put_guest_fpu(vcpu); return i; } diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 2f7e19166658..9c19dfb5011d 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -543,4 +543,28 @@ int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size, unsigned int port, void *data, unsigned int count, int in); +/* + * Lock and/or reload guest FPU and access xstate MSRs. For accesses initiated + * by host, guest FPU is loaded in __msr_io(). For accesses initiated by guest, + * guest FPU should have been loaded already. + */ + +static inline void kvm_get_xstate_msr(struct kvm_vcpu *vcpu, + struct msr_data *msr_info) +{ + KVM_BUG_ON(!vcpu->arch.guest_fpu.fpstate->in_use, vcpu->kvm); + kvm_fpu_get(); + rdmsrl(msr_info->index, msr_info->data); + kvm_fpu_put(); +} + +static inline void kvm_set_xstate_msr(struct kvm_vcpu *vcpu, + struct msr_data *msr_info) +{ + KVM_BUG_ON(!vcpu->arch.guest_fpu.fpstate->in_use, vcpu->kvm); + kvm_fpu_get(); + wrmsrl(msr_info->index, msr_info->data); + kvm_fpu_put(); +} + #endif