From: Yan Zhao <yan.y.zhao@intel.com>
To: "Huang, Kai" <kai.huang@intel.com>
Cc: "kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"seanjc@google.com" <seanjc@google.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"bp@alien8.de" <bp@alien8.de>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"mingo@redhat.com" <mingo@redhat.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>,
"Yamahata, Isaku" <isaku.yamahata@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC, PATCH 05/12] KVM: TDX: Add tdx_pamt_get()/put() helpers
Date: Wed, 7 May 2025 09:01:58 +0800 [thread overview]
Message-ID: <aBqxBmHtpSipnULS@yzhao56-desk.sh.intel.com> (raw)
In-Reply-To: <55c1c173bfb13d897eaaabcc04f38d010608a7e3.camel@intel.com>
On Mon, May 05, 2025 at 08:44:26PM +0800, Huang, Kai wrote:
> On Fri, 2025-05-02 at 16:08 +0300, Kirill A. Shutemov wrote:
> > +static int tdx_pamt_add(atomic_t *pamt_refcount, unsigned long hpa,
> > + struct list_head *pamt_pages)
> > +{
> > + u64 err;
> > +
> > + hpa = ALIGN_DOWN(hpa, SZ_2M);
> > +
> > + spin_lock(&pamt_lock);
>
> Just curious, Can the lock be per-2M-range?
Me too.
Could we introduce smaller locks each covering a 2M range?
And could we deposit 2 pamt pages per-2M hpa range no matter if it's finally
mapped as a huge page or not?
next prev parent reply other threads:[~2025-05-07 1:04 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-02 13:08 [RFC, PATCH 00/12] TDX: Enable Dynamic PAMT Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 01/12] x86/virt/tdx: Allocate page bitmap for " Kirill A. Shutemov
2025-05-05 10:08 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 02/12] x86/virt/tdx: Allocate reference counters for PAMT memory Kirill A. Shutemov
2025-05-05 11:05 ` Huang, Kai
2025-05-08 13:03 ` kirill.shutemov
2025-05-09 1:06 ` Huang, Kai
2025-05-12 9:53 ` kirill.shutemov
2025-05-13 23:24 ` Huang, Kai
2025-05-09 9:52 ` Chao Gao
2025-05-12 9:51 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 03/12] x86/virt/tdx: Add wrappers for TDH.PHYMEM.PAMT.ADD/REMOVE Kirill A. Shutemov
2025-05-09 10:18 ` Chao Gao
2025-05-12 9:55 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 04/12] x86/virt/tdx: Account PAMT memory and print if in /proc/meminfo Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 05/12] KVM: TDX: Add tdx_pamt_get()/put() helpers Kirill A. Shutemov
2025-05-05 12:44 ` Huang, Kai
2025-05-07 1:01 ` Yan Zhao [this message]
2025-05-07 1:15 ` Vishal Annapurve
2025-05-07 2:42 ` Yan Zhao
2025-05-08 13:19 ` kirill.shutemov
2025-05-07 16:31 ` Dave Hansen
2025-05-08 2:08 ` Yan Zhao
2025-05-08 13:21 ` kirill.shutemov
2025-05-08 13:16 ` kirill.shutemov
2025-05-23 9:42 ` kirill.shutemov
2025-05-14 5:25 ` Chao Gao
2025-05-23 10:46 ` Kirill A. Shutemov
2025-05-14 5:33 ` Chao Gao
2025-05-14 6:25 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 06/12] KVM: TDX: Allocate PAMT memory in __tdx_td_init() Kirill A. Shutemov
2025-05-05 12:46 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 07/12] KVM: TDX: Allocate PAMT memory in tdx_td_vcpu_init() Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 08/12] KVM: x86/tdp_mmu: Add phys_prepare() and phys_cleanup() to kvm_x86_ops Kirill A. Shutemov
2025-05-06 11:55 ` Yan Zhao
2025-05-08 13:23 ` Kirill A. Shutemov
2025-05-09 1:25 ` Yan Zhao
2025-05-12 9:55 ` Kirill A. Shutemov
2025-05-14 0:00 ` Huang, Kai
2025-05-14 6:43 ` kirill.shutemov
2025-05-19 5:00 ` Huang, Kai
2025-05-23 12:00 ` kirill.shutemov
2025-06-05 13:01 ` kirill.shutemov
2025-06-05 22:21 ` Huang, Kai
2025-06-06 10:20 ` kirill.shutemov
2025-05-14 6:15 ` Chao Gao
2025-05-02 13:08 ` [RFC, PATCH 09/12] KVM: TDX: Preallocate PAMT pages to be used in page fault path Kirill A. Shutemov
2025-05-14 0:07 ` Huang, Kai
2025-05-14 6:30 ` Chao Gao
2025-05-30 10:28 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 10/12] KVM: TDX: Hookup phys_prepare() and phys_cleanup() kvm_x86_ops Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 11/12] KVM: TDX: Reclaim PAMT memory Kirill A. Shutemov
2025-05-14 1:11 ` Huang, Kai
2025-05-14 15:21 ` Vishal Annapurve
2025-05-19 5:06 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 12/12] x86/virt/tdx: Enable Dynamic PAMT Kirill A. Shutemov
2025-05-14 13:41 ` [RFC, PATCH 00/12] TDX: " Sean Christopherson
2025-05-15 14:22 ` Kirill A. Shutemov
2025-05-15 15:03 ` Dave Hansen
2025-05-15 16:02 ` Kirill A. Shutemov
2025-05-14 20:33 ` Zhi Wang
2025-05-15 9:17 ` Kirill A. Shutemov
2025-05-15 14:03 ` Dave Hansen
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