From: Thomas Gleixner <tglx@linutronix.de>
To: Jing Liu <jing2.liu@intel.com>,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, pbonzini@redhat.com
Cc: seanjc@google.com, jun.nakajima@intel.com, kevin.tian@intel.com,
jing2.liu@linux.intel.com, jing2.liu@intel.com,
guang.zeng@intel.com, wei.w.wang@intel.com, yang.zhong@intel.com
Subject: Re: [PATCH v2 08/23] x86/fpu: Provide fpu_update_guest_perm_features() for guest
Date: Fri, 17 Dec 2021 19:50:24 +0100 [thread overview]
Message-ID: <87wnk3awwf.ffs@tglx> (raw)
In-Reply-To: <20211217153003.1719189-9-jing2.liu@intel.com>
eviewed-by: Thomas Gleixner <tglx@linutronix.de>
On Fri, Dec 17 2021 at 07:29, Jing Liu wrote:
> +/*
> + * fpu_update_guest_perm_features - Enable xfeatures according to guest perm
> + * @guest_fpu: Pointer to the guest FPU container
> + *
> + * Enable all dynamic xfeatures according to guest perm. Invoked if the
> + * caller wants to conservatively expand fpstate buffer instead of waiting
> + * until XCR0 or XFD MSR is written.
> + *
> + * Return: 0 on success, error code otherwise
> + */
> +int fpu_update_guest_perm_features(struct fpu_guest *guest_fpu)
> +{
> + u64 expand;
> +
> + lockdep_assert_preemption_enabled();
> +
> + if (!IS_ENABLED(CONFIG_X86_64))
> + return 0;
> +
> + expand = guest_fpu->perm & ~guest_fpu->xfeatures;
> + if (!expand)
> + return 0;
> +
> + return __xfd_enable_feature(expand, guest_fpu);
> +}
> +EXPORT_SYMBOL_GPL(fpu_update_guest_perm_features);
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
next prev parent reply other threads:[~2021-12-17 18:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-17 15:29 [PATCH v2 00/23] AMX Support in KVM Jing Liu
2021-12-17 15:29 ` [PATCH v2 01/23] x86/fpu: Extend fpu_xstate_prctl() with guest permissions Jing Liu
2021-12-17 18:45 ` Thomas Gleixner
2021-12-17 18:47 ` Thomas Gleixner
2021-12-17 15:29 ` [PATCH v2 02/23] x86/fpu: Prepare guest FPU for dynamically enabled FPU features Jing Liu
2021-12-17 15:29 ` [PATCH v2 03/23] kvm: x86: Fix xstate_required_size() to follow XSTATE alignment rule Jing Liu
2021-12-17 15:29 ` [PATCH v2 04/23] kvm: x86: Exclude unpermitted xfeatures at KVM_GET_SUPPORTED_CPUID Jing Liu
2021-12-20 13:20 ` Paolo Bonzini
2021-12-17 15:29 ` [PATCH v2 05/23] kvm: x86: Check permitted dynamic xfeatures at KVM_SET_CPUID2 Jing Liu
2021-12-17 15:29 ` [PATCH v2 06/23] x86/fpu: Make XFD initialization in __fpstate_reset() a function argument Jing Liu
2021-12-17 15:29 ` [PATCH v2 07/23] x86/fpu: Add guest support to xfd_enable_feature() Jing Liu
2021-12-17 15:29 ` [PATCH v2 08/23] x86/fpu: Provide fpu_update_guest_perm_features() for guest Jing Liu
2021-12-17 18:50 ` Thomas Gleixner [this message]
2021-12-17 15:29 ` [PATCH v2 09/23] kvm: x86: Enable dynamic XSAVE features at KVM_SET_CPUID2 Jing Liu
2021-12-17 15:29 ` [PATCH v2 10/23] x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation Jing Liu
2021-12-17 15:29 ` [PATCH v2 11/23] kvm: x86: Add emulation for IA32_XFD Jing Liu
2021-12-17 15:29 ` [PATCH v2 12/23] x86/fpu: Prepare xfd_err in struct fpu_guest Jing Liu
2021-12-17 15:29 ` [PATCH v2 13/23] kvm: x86: Intercept #NM for saving IA32_XFD_ERR Jing Liu
2021-12-17 15:29 ` [PATCH v2 14/23] kvm: x86: Emulate IA32_XFD_ERR for guest Jing Liu
2021-12-17 15:29 ` [PATCH v2 15/23] kvm: x86: Add XCR0 support for Intel AMX Jing Liu
2021-12-17 15:29 ` [PATCH v2 16/23] kvm: x86: Add CPUID " Jing Liu
2021-12-17 15:29 ` [PATCH v2 17/23] x86/fpu: add uabi_size to guest_fpu Jing Liu
2021-12-17 15:29 ` [PATCH v2 18/23] kvm: x86: Get/set expanded xstate buffer Jing Liu
2021-12-20 9:04 ` Paolo Bonzini
2021-12-21 2:45 ` Wang, Wei W
2021-12-21 8:45 ` Paolo Bonzini
2021-12-21 9:06 ` Wang, Wei W
2021-12-21 9:30 ` Paolo Bonzini
2021-12-17 15:29 ` [PATCH v2 19/23] kvm: selftests: Add support for KVM_CAP_XSAVE2 Jing Liu
2021-12-20 13:19 ` Paolo Bonzini
2021-12-17 15:30 ` [PATCH v2 20/23] docs: kvm: Add KVM_GET_XSAVE2 Jing Liu
2021-12-20 9:04 ` Paolo Bonzini
2021-12-17 15:30 ` [PATCH v2 21/23] x86/fpu: Provide fpu_sync_guest_vmexit_xfd_state() Jing Liu
2021-12-17 15:30 ` [PATCH v2 22/23] kvm: x86: Disable interception for IA32_XFD on demand Jing Liu
2021-12-20 9:07 ` Paolo Bonzini
2021-12-21 6:42 ` Liu, Jing2
2021-12-21 8:46 ` Paolo Bonzini
2021-12-17 15:30 ` [PATCH v2 23/23] kvm: x86: Disable RDMSR interception of IA32_XFD_ERR Jing Liu
2021-12-20 9:08 ` Paolo Bonzini
2021-12-21 6:29 ` Liu, Jing2
2021-12-21 8:48 ` Paolo Bonzini
2021-12-21 9:00 ` Liu, Jing2
2021-12-21 9:05 ` Paolo Bonzini
2021-12-17 18:52 ` [PATCH v2 00/23] AMX Support in KVM Thomas Gleixner
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