linux-kernel - Re: [PATCH 4/7] KVM: TDX: restore host xsave state when exit from the guest TD

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Message-ID: <Z00hAGYg1BQsiHJ5@intel.com>
Date: Mon, 2 Dec 2024 10:52:48 +0800
From: Chao Gao <chao.gao@...el.com>
To: Adrian Hunter <adrian.hunter@...el.com>
CC: <pbonzini@...hat.com>, <seanjc@...gle.com>, <kvm@...r.kernel.org>,
	<dave.hansen@...ux.intel.com>, <rick.p.edgecombe@...el.com>,
	<kai.huang@...el.com>, <reinette.chatre@...el.com>, <xiaoyao.li@...el.com>,
	<tony.lindgren@...ux.intel.com>, <binbin.wu@...ux.intel.com>,
	<dmatlack@...gle.com>, <isaku.yamahata@...el.com>, <nik.borisov@...e.com>,
	<linux-kernel@...r.kernel.org>, <x86@...nel.org>, <yan.y.zhao@...el.com>,
	<weijiang.yang@...el.com>
Subject: Re: [PATCH 4/7] KVM: TDX: restore host xsave state when exit from
 the guest TD

>>> /* 
>>> * Before returning from TDH.VP.ENTER, the TDX Module assigns:
>>> *   XCR0 to the TD’s user-mode feature bits of XFAM (bits 7:0, 9)
>>> *   IA32_XSS to the TD's supervisor-mode feature bits of XFAM (bits 8, 16:10)

TILECFG state (bit 17) and TILEDATA state (bit 18) are also user state. Are they
cleared unconditionally?

>>> */
>>> #define TDX_XFAM_XCR0_MASK	(GENMASK(7, 0) | BIT(9))
>>> #define TDX_XFAM_XSS_MASK	(GENMASK(16, 10) | BIT(8))
>>> #define TDX_XFAM_MASK		(TDX_XFAM_XCR0_MASK | TDX_XFAM_XSS_MASK)