linux-kernel - Re: [RFC, PATCH 03/12] x86/virt/tdx: Add wrappers for TDH.PHYMEM.PAMT.ADD/REMOVE

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Message-ID: <aB3WWUSESKt9niJV@intel.com>
Date: Fri, 9 May 2025 18:18:01 +0800
From: Chao Gao <chao.gao@...el.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC: <pbonzini@...hat.com>, <seanjc@...gle.com>, <rick.p.edgecombe@...el.com>,
	<isaku.yamahata@...el.com>, <kai.huang@...el.com>, <yan.y.zhao@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <kvm@...r.kernel.org>, <x86@...nel.org>,
	<linux-coco@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC, PATCH 03/12] x86/virt/tdx: Add wrappers for
 TDH.PHYMEM.PAMT.ADD/REMOVE

> int tdx_guest_keyid_alloc(void);
> u32 tdx_get_nr_guest_keyids(void);
> void tdx_guest_keyid_free(unsigned int keyid);
>@@ -197,6 +202,9 @@ u64 tdh_mem_page_remove(struct tdx_td *td, u64 gpa, u64 level, u64 *ext_err1, u6
> u64 tdh_phymem_cache_wb(bool resume);
> u64 tdh_phymem_page_wbinvd_tdr(struct tdx_td *td);
> u64 tdh_phymem_page_wbinvd_hkid(u64 hkid, struct page *page);
>+u64 tdh_phymem_pamt_add(unsigned long hpa, struct list_head *pamt_pages);
>+u64 tdh_phymem_pamt_remove(unsigned long hpa, struct list_head *pamt_pages);

When these SEAMCALL wrappers were added, Dave requested that a struct page
be passed in instead of an HPA [*]. Does this apply to
tdh_phymem_pamt_add/remove()?

[*]: https://lore.kernel.org/kvm/30d0cef5-82d5-4325-b149-0e99833b8785@intel.com/