From patchwork Fri Oct 22 18:55:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12578501 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BD06C433EF for ; Fri, 22 Oct 2021 18:55:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 475C56108D for ; Fri, 22 Oct 2021 18:55:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232685AbhJVS6M (ORCPT ); Fri, 22 Oct 2021 14:58:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232461AbhJVS6J (ORCPT ); Fri, 22 Oct 2021 14:58:09 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E04A0C061764; Fri, 22 Oct 2021 11:55:51 -0700 (PDT) Message-ID: <20211022185312.896403942@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1634928950; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=htssBdQUYBVwaYBGDYdhnsAarY+zPvx6OtXbFv+POrs=; b=IFieWsjZyEpNUblkBsaaSP2KMpzDclpQroFaC1DnH75V6tDWeOdgHSp1lw4N6I6oHqbWoa meEA71u5+34FPi7n+OKfyCvY1GGluzgnfSbX+ty9gbR3tOrvS5it62/jmyadohhQLI3CYH cO84HwNdWTEhhAD7cvyjD5bbErAOtg/d0mCytc5sRHXmS4+AhgrhwG5dCzuMtzFJHZgrje JA0oe/4ZTyJi2rIzni2xOX35WOUctpjkPMv+x/HKEnPT1/2xL+qoRnE6La86CTQCoX5t/e g9n1pePpjoOjx3A5QosyCmbummmqN/xgLq/QdFkHUJ3CpzRemxYJ29+1KGAfUA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1634928950; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=htssBdQUYBVwaYBGDYdhnsAarY+zPvx6OtXbFv+POrs=; b=8GknkpgIMk8a5vVhBqWKYmObv6T/BEEm2nZ18QguXDkKsgffKxYtxIpkKKAZvboz4+DbIr 3+F8gWJbTb9AY3Bg== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, "Liu, Jing2" , Paolo Bonzini , "Bae, Chang Seok" , Dave Hansen , Arjan van de Ven , kvm@vger.kernel.org, "Nakajima, Jun" , Sean Christopherson Subject: [patch V2 1/4] x86/fpu: Prepare for sanitizing KVM FPU code References: <20211022184540.581350173@linutronix.de> MIME-Version: 1.0 Date: Fri, 22 Oct 2021 20:55:49 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org For the upcoming AMX support it's necessary to do a proper integration with KVM. To avoid more nasty hackery in KVM which violate encapsulation extend struct fpu and fpstate so the fpstate switching can be consolidated and simplified. Currently KVM allocates two FPU structs which are used for saving the user state of the vCPU thread and restoring the guest state when entering vcpu_run() and doing the reverse operation before leaving vcpu_run(). With the new fpstate mechanism this can be reduced to one extra buffer by swapping the fpstate pointer in current::thread::fpu. This makes the upcoming support for AMX and XFD simpler because then fpstate information (features, sizes, xfd) are always consistent and it does not require any nasty workarounds. Add fpu::__task_fpstate to save the regular fpstate pointer while the task is inside vcpu_run(). Add some state fields to fpstate to indicate the nature of the state. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/fpu/types.h | 44 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) --- diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h index b0cf6b75e467..81a01de1fec2 100644 --- a/arch/x86/include/asm/fpu/types.h +++ b/arch/x86/include/asm/fpu/types.h @@ -322,8 +322,32 @@ struct fpstate { /* @user_xfeatures: xfeatures valid in UABI buffers */ u64 user_xfeatures; + /* @is_valloc: Indicator for dynamically allocated state */ + unsigned int is_valloc : 1; + + /* @is_guest: Indicator for guest state (KVM) */ + unsigned int is_guest : 1; + + /* + * @is_confidential: Indicator for KVM confidential mode. + * The FPU registers are restored by the + * vmentry firmware from encrypted guest + * memory. On vmexit the FPU registers are + * saved by firmware to encrypted guest memory + * and the registers are scrubbed before + * returning to the host. So there is no + * content which is worth saving and restoring + * The fpstate has to be there so that + * preemption and softirq FPU usage works. + * without special casing. + */ + unsigned int is_confidential : 1; + + /* @in_use: State is in use */ + unsigned int in_use : 1; + /* @regs: The register state union for all supported formats */ - union fpregs_state regs; + union fpregs_state regs; /* @regs is dynamically sized! Don't add anything after @regs! */ } __attribute__ ((aligned (64))); @@ -364,6 +388,14 @@ struct fpu { struct fpstate *fpstate; /* + * @__task_fpstate: + * + * Pointer to an inactive struct fpstate. Initialized to NULL. Is + * used only for KVM support to swap out the regular task fpstate. + */ + struct fpstate *__task_fpstate; + + /* * @__fpstate: * * Initial in-memory storage for FPU registers which are saved in @@ -379,6 +411,16 @@ struct fpu { }; /* + * Guest pseudo FPU container + */ +struct fpu_guest { + /* + * @fpstate: Pointer to the allocated guest fpstate + */ + struct fpstate *fpstate; +}; + +/* * FPU state configuration data. Initialized at boot time. Read only after init. */ struct fpu_state_config { From patchwork Fri Oct 22 18:55:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12578503 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CE19C433FE for ; Fri, 22 Oct 2021 18:55:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 596F3610FF for ; Fri, 22 Oct 2021 18:55:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233002AbhJVS6N (ORCPT ); Fri, 22 Oct 2021 14:58:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58124 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232556AbhJVS6L (ORCPT ); Fri, 22 Oct 2021 14:58:11 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7425BC061764; Fri, 22 Oct 2021 11:55:53 -0700 (PDT) Message-ID: <20211022185312.954684740@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1634928952; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=kCtOWqjSOO50HHU/dvNrsvDWI43RKBmIiECch92mDqE=; b=cbDwcui6g7/5nwRW79oytZoY5tXNFcVzkbndV/Klflub5k46Opd1fch3MmyuQhtOKnmp0J nSIcSH388OuTey5jOBzVVZ95WSjCKKsbK4n3SPeLmgKD/2dQTM/MZz+MVKCABn+F+SnC3f mMqJx3kQ4dNW1XKUEB7oOvfnlKreZMqDn740oBUGJOpTQOLJRBaz7iyNTAfPwz6o+cTgow 18bfft0Jk+ucZ4cQ68D42e28s0o8lOJa8hIOXr4GhtHHlU77Kd/Yle6QQ1MCmXNbYMaPYz XRdPJu0wcLlqBKf1egCgNYrqAQwLkoJ1M8GiBGM/Cn0OZYeXQpjacJ1NJ2GbMg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1634928952; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=kCtOWqjSOO50HHU/dvNrsvDWI43RKBmIiECch92mDqE=; b=i6Fo2Gt+SMBKokgIZXy5VbvrxKU8z5P7SvrgAYOD7tWMXaAevMo19oMT9Wq/2wuEhuHtwC 2iWG//QUj+dgaeBw== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, "Liu, Jing2" , Paolo Bonzini , "Bae, Chang Seok" , Dave Hansen , Arjan van de Ven , kvm@vger.kernel.org, "Nakajima, Jun" , Sean Christopherson Subject: [patch V2 2/4] x86/fpu: Provide infrastructure for KVM FPU cleanup References: <20211022184540.581350173@linutronix.de> MIME-Version: 1.0 Date: Fri, 22 Oct 2021 20:55:51 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org For the upcoming AMX support it's necessary to do a proper integration with KVM. Currently KVM allocates two FPU structs which are used for saving the user state of the vCPU thread and restoring the guest state when entering vcpu_run() and doing the reverse operation before leaving vcpu_run(). With the new fpstate mechanism this can be reduced to one extra buffer by swapping the fpstate pointer in current::thread::fpu. This makes the upcoming support for AMX and XFD simpler because then fpstate information (features, sizes, xfd) are always consistent and it does not require any nasty workarounds. Provide: - An allocator which initializes the state properly - A replacement for the existing FPU swap mechanim Aside of the reduced memory foot print, this also makes state switching more efficient when TIF_FPU_NEED_LOAD is set. It does not require a memcpy as the state is already correct in the to be swapped out fpstate. The existing interfaces will be removed once KVM is converted over. Signed-off-by: Thomas Gleixner --- V2: Remove the restore_mask argument as the result is constant anyway - Paolo --- arch/x86/include/asm/fpu/api.h | 13 ++++++ arch/x86/kernel/fpu/core.c | 85 ++++++++++++++++++++++++++++++++++++++--- 2 files changed, 92 insertions(+), 6 deletions(-) --- --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -135,9 +135,22 @@ extern void fpu_init_fpstate_user(struct extern void fpstate_clear_xstate_component(struct fpstate *fps, unsigned int xfeature); /* KVM specific functions */ +extern bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu); +extern void fpu_free_guest_fpstate(struct fpu_guest *gfpu); +extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest); extern void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask); extern int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0, u32 *pkru); extern void fpu_copy_fpstate_to_kvm_uabi(struct fpu *fpu, void *buf, unsigned int size, u32 pkru); +static inline void fpstate_set_confidential(struct fpu_guest *gfpu) +{ + gfpu->fpstate->is_confidential = true; +} + +static inline bool fpstate_is_confidential(struct fpu_guest *gfpu) +{ + return gfpu->fpstate->is_confidential; +} + #endif /* _ASM_X86_FPU_API_H */ --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -176,6 +176,75 @@ void fpu_reset_from_exception_fixup(void } #if IS_ENABLED(CONFIG_KVM) +static void __fpstate_reset(struct fpstate *fpstate); + +bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu) +{ + struct fpstate *fpstate; + unsigned int size; + + size = fpu_user_cfg.default_size + ALIGN(offsetof(struct fpstate, regs), 64); + fpstate = vzalloc(size); + if (!fpstate) + return false; + + __fpstate_reset(fpstate); + fpstate_init_user(fpstate); + fpstate->is_valloc = true; + fpstate->is_guest = true; + + gfpu->fpstate = fpstate; + return true; +} +EXPORT_SYMBOL_GPL(fpu_alloc_guest_fpstate); + +void fpu_free_guest_fpstate(struct fpu_guest *gfpu) +{ + struct fpstate *fps = gfpu->fpstate; + + if (!fps) + return; + + if (WARN_ON_ONCE(!fps->is_valloc || !fps->is_guest || fps->in_use)) + return; + + gfpu->fpstate = NULL; + vfree(fps); +} +EXPORT_SYMBOL_GPL(fpu_free_guest_fpstate); + +int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest) +{ + struct fpstate *guest_fps = guest_fpu->fpstate; + struct fpu *fpu = ¤t->thread.fpu; + struct fpstate *cur_fps = fpu->fpstate; + + fpregs_lock(); + if (!cur_fps->is_confidential && !test_thread_flag(TIF_NEED_FPU_LOAD)) + save_fpregs_to_fpstate(fpu); + + /* Swap fpstate */ + if (enter_guest) { + fpu->__task_fpstate = cur_fps; + fpu->fpstate = guest_fps; + guest_fps->in_use = true; + } else { + guest_fps->in_use = false; + fpu->fpstate = fpu->__task_fpstate; + fpu->__task_fpstate = NULL; + } + + cur_fps = fpu->fpstate; + + if (!cur_fps->is_confidential) + restore_fpregs_from_fpstate(cur_fps, XFEATURE_MASK_FPSTATE); + + fpregs_mark_activate(); + fpregs_unlock(); + return 0; +} +EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpstate); + void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask) { fpregs_lock(); @@ -352,16 +421,20 @@ void fpstate_init_user(struct fpstate *f fpstate_init_fstate(fpstate); } +static void __fpstate_reset(struct fpstate *fpstate) +{ + /* Initialize sizes and feature masks */ + fpstate->size = fpu_kernel_cfg.default_size; + fpstate->user_size = fpu_user_cfg.default_size; + fpstate->xfeatures = fpu_kernel_cfg.default_features; + fpstate->user_xfeatures = fpu_user_cfg.default_features; +} + void fpstate_reset(struct fpu *fpu) { /* Set the fpstate pointer to the default fpstate */ fpu->fpstate = &fpu->__fpstate; - - /* Initialize sizes and feature masks */ - fpu->fpstate->size = fpu_kernel_cfg.default_size; - fpu->fpstate->user_size = fpu_user_cfg.default_size; - fpu->fpstate->xfeatures = fpu_kernel_cfg.default_features; - fpu->fpstate->user_xfeatures = fpu_user_cfg.default_features; + __fpstate_reset(fpu->fpstate); } #if IS_ENABLED(CONFIG_KVM) From patchwork Fri Oct 22 18:55:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12578505 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60060C433FE for ; Fri, 22 Oct 2021 18:56:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4639361181 for ; Fri, 22 Oct 2021 18:56:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233417AbhJVS6P (ORCPT ); Fri, 22 Oct 2021 14:58:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232750AbhJVS6N (ORCPT ); Fri, 22 Oct 2021 14:58:13 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B441C061764; Fri, 22 Oct 2021 11:55:55 -0700 (PDT) Message-ID: <20211022185313.019454292@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1634928953; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=CwUvf8q/20tqiHCZtTVMwauJvXyvMXh5YpIDe6vTmPU=; b=n44sWEosHhm6DFU6lMHJDX+BJh1Qwb/SyaJ7ACQ4l29lqdjFaLfer5rNDIzFnHrmsjDgO3 J8t741KFisbjGCHQOo879GsVmMKafdzLZ5eoPevBmJvopQPbtq65VdTn+hyegQ+PSxI67z kqAHnaEBmHteK4hmJJpMnKoe5VaqyKt+35uGB4rl+NStYIa/lhGK6RklMAErd86KMHYK6G SFaelex6Go29Vm4Uv8B6qMBeUIQcxwf9WKG3vKzL6sSTpKFPwoSSMtB1tm+zJ38Dv//Vml gCrACATSN6ot5wNtoScbnW+M0oMwXaEIaXm/rU8tt02QFRcgy2+BGWhHJXB0vQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1634928953; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=CwUvf8q/20tqiHCZtTVMwauJvXyvMXh5YpIDe6vTmPU=; b=RvTAq6n+JHP2x7RtP7sy5kWlFNOAQrL82iInU+XZ5z3HoehDHDMuyuldAEXhudh61mSkDg 53+aul//BVGd3eAw== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, "Liu, Jing2" , Paolo Bonzini , "Bae, Chang Seok" , Dave Hansen , Arjan van de Ven , kvm@vger.kernel.org, "Nakajima, Jun" , Sean Christopherson Subject: [patch V2 3/4] x86/kvm: Convert FPU handling to a single swap buffer References: <20211022184540.581350173@linutronix.de> MIME-Version: 1.0 Date: Fri, 22 Oct 2021 20:55:53 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org For the upcoming AMX support it's necessary to do a proper integration with KVM. Currently KVM allocates two FPU structs which are used for saving the user state of the vCPU thread and restoring the guest state when entering vcpu_run() and doing the reverse operation before leaving vcpu_run(). With the new fpstate mechanism this can be reduced to one extra buffer by swapping the fpstate pointer in current::thread::fpu. This makes the upcoming support for AMX and XFD simpler because then fpstate information (features, sizes, xfd) are always consistent and it does not require any nasty workarounds. Convert the KVM FPU code over to this new scheme. Signed-off-by: Thomas Gleixner --- V2: Remove the restore_mask argument - Paolo --- arch/x86/include/asm/fpu/api.h | 4 - arch/x86/include/asm/kvm_host.h | 7 --- arch/x86/kernel/fpu/core.c | 16 +++---- arch/x86/kvm/svm/svm.c | 7 +-- arch/x86/kvm/x86.c | 88 ++++++++++------------------------------ 5 files changed, 40 insertions(+), 82 deletions(-) --- --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -140,8 +140,8 @@ extern void fpu_free_guest_fpstate(struc extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest); extern void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask); -extern int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0, u32 *pkru); -extern void fpu_copy_fpstate_to_kvm_uabi(struct fpu *fpu, void *buf, unsigned int size, u32 pkru); +extern void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru); +extern int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, u64 xcr0, u32 *vpkru); static inline void fpstate_set_confidential(struct fpu_guest *gfpu) { --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -691,11 +691,10 @@ struct kvm_vcpu_arch { * * Note that while the PKRU state lives inside the fpu registers, * it is switched out separately at VMENTER and VMEXIT time. The - * "guest_fpu" state here contains the guest FPU context, with the + * "guest_fpstate" state here contains the guest FPU context, with the * host PRKU bits. */ - struct fpu *user_fpu; - struct fpu *guest_fpu; + struct fpu_guest guest_fpu; u64 xcr0; u64 guest_supported_xcr0; @@ -1685,8 +1684,6 @@ void kvm_vcpu_deliver_sipi_vector(struct int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, int reason, bool has_error_code, u32 error_code); -void kvm_free_guest_fpu(struct kvm_vcpu *vcpu); - void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0); void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4); int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0); --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -268,10 +268,10 @@ void fpu_swap_kvm_fpu(struct fpu *save, } EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpu); -void fpu_copy_fpstate_to_kvm_uabi(struct fpu *fpu, void *buf, - unsigned int size, u32 pkru) +void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, + unsigned int size, u32 pkru) { - struct fpstate *kstate = fpu->fpstate; + struct fpstate *kstate = gfpu->fpstate; union fpregs_state *ustate = buf; struct membuf mb = { .p = buf, .left = size }; @@ -284,12 +284,12 @@ void fpu_copy_fpstate_to_kvm_uabi(struct ustate->xsave.header.xfeatures = XFEATURE_MASK_FPSSE; } } -EXPORT_SYMBOL_GPL(fpu_copy_fpstate_to_kvm_uabi); +EXPORT_SYMBOL_GPL(fpu_copy_guest_fpstate_to_uabi); -int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0, - u32 *vpkru) +int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, + u64 xcr0, u32 *vpkru) { - struct fpstate *kstate = fpu->fpstate; + struct fpstate *kstate = gfpu->fpstate; const union fpregs_state *ustate = buf; struct pkru_state *xpkru; int ret; @@ -320,7 +320,7 @@ int fpu_copy_kvm_uabi_to_fpstate(struct xstate_init_xcomp_bv(&kstate->regs.xsave, fpu_user_cfg.max_features); return 0; } -EXPORT_SYMBOL_GPL(fpu_copy_kvm_uabi_to_fpstate); +EXPORT_SYMBOL_GPL(fpu_copy_uabi_to_guest_fpstate); #endif /* CONFIG_KVM */ void kernel_fpu_begin_mask(unsigned int kfpu_mask) --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include "trace.h" @@ -1346,10 +1347,10 @@ static int svm_create_vcpu(struct kvm_vc /* * SEV-ES guests maintain an encrypted version of their FPU * state which is restored and saved on VMRUN and VMEXIT. - * Free the fpu structure to prevent KVM from attempting to - * access the FPU state. + * Mark vcpu->arch.guest_fpu->fpstate as scratch so it won't + * do xsave/xrstor on it. */ - kvm_free_guest_fpu(vcpu); + fpstate_set_confidential(&vcpu->arch.guest_fpu); } err = avic_init_vcpu(svm); --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -295,8 +295,6 @@ u64 __read_mostly host_xcr0; u64 __read_mostly supported_xcr0; EXPORT_SYMBOL_GPL(supported_xcr0); -static struct kmem_cache *x86_fpu_cache; - static struct kmem_cache *x86_emulator_cache; /* @@ -4698,23 +4696,24 @@ static int kvm_vcpu_ioctl_x86_set_debugr static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, struct kvm_xsave *guest_xsave) { - if (!vcpu->arch.guest_fpu) + if (fpstate_is_confidential(&vcpu->arch.guest_fpu)) return; - fpu_copy_fpstate_to_kvm_uabi(vcpu->arch.guest_fpu, guest_xsave->region, - sizeof(guest_xsave->region), - vcpu->arch.pkru); + fpu_copy_guest_fpstate_to_uabi(&vcpu->arch.guest_fpu, + guest_xsave->region, + sizeof(guest_xsave->region), + vcpu->arch.pkru); } static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, struct kvm_xsave *guest_xsave) { - if (!vcpu->arch.guest_fpu) + if (fpstate_is_confidential(&vcpu->arch.guest_fpu)) return 0; - return fpu_copy_kvm_uabi_to_fpstate(vcpu->arch.guest_fpu, - guest_xsave->region, - supported_xcr0, &vcpu->arch.pkru); + return fpu_copy_uabi_to_guest_fpstate(&vcpu->arch.guest_fpu, + guest_xsave->region, + supported_xcr0, &vcpu->arch.pkru); } static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, @@ -8287,18 +8286,11 @@ int kvm_arch_init(void *opaque) } r = -ENOMEM; - x86_fpu_cache = kmem_cache_create("x86_fpu", sizeof(struct fpu), - __alignof__(struct fpu), SLAB_ACCOUNT, - NULL); - if (!x86_fpu_cache) { - printk(KERN_ERR "kvm: failed to allocate cache for x86 fpu\n"); - goto out; - } x86_emulator_cache = kvm_alloc_emulator_cache(); if (!x86_emulator_cache) { pr_err("kvm: failed to allocate cache for x86 emulator\n"); - goto out_free_x86_fpu_cache; + goto out; } user_return_msrs = alloc_percpu(struct kvm_user_return_msrs); @@ -8336,8 +8328,6 @@ int kvm_arch_init(void *opaque) free_percpu(user_return_msrs); out_free_x86_emulator_cache: kmem_cache_destroy(x86_emulator_cache); -out_free_x86_fpu_cache: - kmem_cache_destroy(x86_fpu_cache); out: return r; } @@ -8364,7 +8354,6 @@ void kvm_arch_exit(void) kvm_mmu_module_exit(); free_percpu(user_return_msrs); kmem_cache_destroy(x86_emulator_cache); - kmem_cache_destroy(x86_fpu_cache); #ifdef CONFIG_KVM_XEN static_key_deferred_flush(&kvm_xen_enabled); WARN_ON(static_branch_unlikely(&kvm_xen_enabled.key)); @@ -9787,23 +9776,17 @@ static int complete_emulated_mmio(struct static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) { /* - * Guests with protected state have guest_fpu == NULL which makes - * the swap only save the host state. Exclude PKRU from restore as - * it is restored separately in kvm_x86_ops.run(). + * Exclude PKRU from restore as restored separately in + * kvm_x86_ops.run(). */ - fpu_swap_kvm_fpu(vcpu->arch.user_fpu, vcpu->arch.guest_fpu, - ~XFEATURE_MASK_PKRU); + fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, true); trace_kvm_fpu(1); } /* When vcpu_run ends, restore user space FPU context. */ static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { - /* - * Guests with protected state have guest_fpu == NULL which makes - * swap only restore the host state. - */ - fpu_swap_kvm_fpu(vcpu->arch.guest_fpu, vcpu->arch.user_fpu, ~0ULL); + fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, false); ++vcpu->stat.fpu_reload; trace_kvm_fpu(0); } @@ -10384,12 +10367,12 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct k { struct fxregs_state *fxsave; - if (!vcpu->arch.guest_fpu) + if (fpstate_is_confidential(&vcpu->arch.guest_fpu)) return 0; vcpu_load(vcpu); - fxsave = &vcpu->arch.guest_fpu->fpstate->regs.fxsave; + fxsave = &vcpu->arch.guest_fpu.fpstate->regs.fxsave; memcpy(fpu->fpr, fxsave->st_space, 128); fpu->fcw = fxsave->cwd; fpu->fsw = fxsave->swd; @@ -10407,12 +10390,12 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct k { struct fxregs_state *fxsave; - if (!vcpu->arch.guest_fpu) + if (fpstate_is_confidential(&vcpu->arch.guest_fpu)) return 0; vcpu_load(vcpu); - fxsave = &vcpu->arch.guest_fpu->fpstate->regs.fxsave; + fxsave = &vcpu->arch.guest_fpu.fpstate->regs.fxsave; memcpy(fxsave->st_space, fpu->fpr, 128); fxsave->cwd = fpu->fcw; @@ -10473,15 +10456,6 @@ static void fx_init(struct kvm_vcpu *vcp vcpu->arch.cr0 |= X86_CR0_ET; } -void kvm_free_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (vcpu->arch.guest_fpu) { - kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu); - vcpu->arch.guest_fpu = NULL; - } -} -EXPORT_SYMBOL_GPL(kvm_free_guest_fpu); - int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) { if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) @@ -10536,22 +10510,11 @@ int kvm_arch_vcpu_create(struct kvm_vcpu if (!alloc_emulate_ctxt(vcpu)) goto free_wbinvd_dirty_mask; - vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache, - GFP_KERNEL_ACCOUNT); - if (!vcpu->arch.user_fpu) { - pr_err("kvm: failed to allocate userspace's fpu\n"); - goto free_emulate_ctxt; - } - - vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache, - GFP_KERNEL_ACCOUNT); - if (!vcpu->arch.guest_fpu) { + if (!fpu_alloc_guest_fpstate(&vcpu->arch.guest_fpu)) { pr_err("kvm: failed to allocate vcpu's fpu\n"); - goto free_user_fpu; + goto free_emulate_ctxt; } - fpu_init_fpstate_user(vcpu->arch.user_fpu); - fpu_init_fpstate_user(vcpu->arch.guest_fpu); fx_init(vcpu); vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); @@ -10584,9 +10547,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu return 0; free_guest_fpu: - kvm_free_guest_fpu(vcpu); -free_user_fpu: - kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu); + fpu_free_guest_fpstate(&vcpu->arch.guest_fpu); free_emulate_ctxt: kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt); free_wbinvd_dirty_mask: @@ -10635,8 +10596,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vc kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt); free_cpumask_var(vcpu->arch.wbinvd_dirty_mask); - kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu); - kvm_free_guest_fpu(vcpu); + fpu_free_guest_fpstate(&vcpu->arch.guest_fpu); kvm_hv_vcpu_uninit(vcpu); kvm_pmu_destroy(vcpu); @@ -10688,8 +10648,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcp kvm_async_pf_hash_reset(vcpu); vcpu->arch.apf.halted = false; - if (vcpu->arch.guest_fpu && kvm_mpx_supported()) { - struct fpstate *fpstate = vcpu->arch.guest_fpu->fpstate; + if (vcpu->arch.guest_fpu.fpstate && kvm_mpx_supported()) { + struct fpstate *fpstate = vcpu->arch.guest_fpu.fpstate; /* * To avoid have the INIT path from kvm_apic_has_events() that be From patchwork Fri Oct 22 18:55:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12578507 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A143C433EF for ; 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Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/fpu/api.h | 2 -- arch/x86/kernel/fpu/core.c | 32 -------------------------------- 2 files changed, 34 deletions(-) --- --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -131,14 +131,12 @@ static inline void fpstate_init_soft(str DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx); /* fpstate-related functions which are exported to KVM */ -extern void fpu_init_fpstate_user(struct fpu *fpu); extern void fpstate_clear_xstate_component(struct fpstate *fps, unsigned int xfeature); /* KVM specific functions */ extern bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu); extern void fpu_free_guest_fpstate(struct fpu_guest *gfpu); extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest); -extern void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask); extern void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru); extern int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, u64 xcr0, u32 *vpkru); --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -245,29 +245,6 @@ int fpu_swap_kvm_fpstate(struct fpu_gues } EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpstate); -void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask) -{ - fpregs_lock(); - - if (save) { - struct fpstate *fpcur = current->thread.fpu.fpstate; - - if (test_thread_flag(TIF_NEED_FPU_LOAD)) - memcpy(&save->fpstate->regs, &fpcur->regs, fpcur->size); - else - save_fpregs_to_fpstate(save); - } - - if (rstor) { - restore_mask &= XFEATURE_MASK_FPSTATE; - restore_fpregs_from_fpstate(rstor->fpstate, restore_mask); - } - - fpregs_mark_activate(); - fpregs_unlock(); -} -EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpu); - void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru) { @@ -437,15 +414,6 @@ void fpstate_reset(struct fpu *fpu) __fpstate_reset(fpu->fpstate); } -#if IS_ENABLED(CONFIG_KVM) -void fpu_init_fpstate_user(struct fpu *fpu) -{ - fpstate_reset(fpu); - fpstate_init_user(fpu->fpstate); -} -EXPORT_SYMBOL_GPL(fpu_init_fpstate_user); -#endif - /* Clone current's FPU state on fork */ int fpu_clone(struct task_struct *dst) {