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X-CSE-ConnectionGUID: g33Tp+a0RT2xgSxaIOwhwQ== X-CSE-MsgGUID: 5NGCnXkQQIiH5T6lmlvssw== X-IronPort-AV: E=McAfee;i="6700,10204,11365"; a="42463012" X-IronPort-AV: E=Sophos;i="6.14,229,1736841600"; d="scan'208";a="42463012" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2025 09:53:18 -0800 X-CSE-ConnectionGUID: 3hSEaVzlRh+JfdVeO9tNiw== X-CSE-MsgGUID: uZpkLxUhQvuMmz6dIM3wug== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,229,1736841600"; d="scan'208";a="124473652" Received: from dnelso2-mobl.amr.corp.intel.com (HELO [10.125.110.132]) ([10.125.110.132]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2025 09:53:17 -0800 Message-ID: <4e18ddd0-a122-449b-bbbd-aeed3475a324@intel.com> Date: Fri, 7 Mar 2025 09:53:40 -0800 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/10] x86/fpu/xstate: Correct guest fpstate size calculation To: Chao Gao , tglx@linutronix.de, x86@kernel.org, seanjc@google.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: peterz@infradead.org, rick.p.edgecombe@intel.com, weijiang.yang@intel.com, john.allen@amd.com, bp@alien8.de References: <20250307164123.1613414-1-chao.gao@intel.com> <20250307164123.1613414-5-chao.gao@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/7/25 08:41, Chao Gao wrote: > Note that this issue does not cause any functional problems because the > guest fpstate is allocated using vmalloc(), which aligns the size to a > full page, providing enough space for all existing supervisor components. > On Emerald Rapids CPUs, the guest fpstate after this correction is ~2880 > bytes. How about we move up the fpstate pointers at allocation time so they just scrape the end of the vmalloc buffer? Basically, move the page-alignment padding to the beginning of the first page instead of the end of the last page.