From: Kiryl Shutsemau <kas@kernel.org>
To: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Cc: "Verma, Vishal L" <vishal.l.verma@intel.com>,
"seanjc@google.com" <seanjc@google.com>,
"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"tglx@kernel.org" <tglx@kernel.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH v2 3/5] x86/virt/tdx: Add SEAMCALL wrapper for TDH.SYS.DISABLE
Date: Tue, 31 Mar 2026 13:18:27 +0100 [thread overview]
Message-ID: <acu4raBTjdFcfVlS@thinkstation> (raw)
In-Reply-To: <def1f4395865ad0d22be245647fbb75ab8698ab8.camel@intel.com>
On Mon, Mar 30, 2026 at 07:25:22PM +0000, Edgecombe, Rick P wrote:
> > I assumed that if the SEAMCALL fails other SEAMCALLs suppose to be
> > functional. Hm?
>
> The behavior should be that once you make this seamcall (assuming it's
> supported) that no other seamcalls can be made. They will return an
> error. Do you think something else would be better? If it's an old TDX
> module, nothing happens of course.
I guess the actual behaviour is dependant on the return code. It is
obviously going to be the case for TDX_SUCCESS. And from the discussion,
I guess that's true for TDX_SYS_BUSY and TDX_INTERRUPTED_RESUMABLE.
What about other cases? The spec draft also lists TDX_SYS_NOT_READY and
TDX_SYS_SHUTDOWN.
I wounder if it can affect the kernel. Consider the case when kexec
(crash kernel start) happens due to crash on TDX module.
Will we be able to shutdown TDX module cleanly and make kexec safe?
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2026-03-31 12:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 20:59 [PATCH v2 0/5] Fuller TDX kexec support Vishal Verma
2026-03-23 20:59 ` [PATCH v2 1/5] x86/tdx: Move all TDX error defines into <asm/shared/tdx_errno.h> Vishal Verma
2026-03-24 9:49 ` Chao Gao
2026-03-31 19:30 ` Sean Christopherson
2026-03-31 21:46 ` Edgecombe, Rick P
2026-03-23 20:59 ` [PATCH v2 2/5] x86/virt/tdx: Pull kexec cache flush logic into arch/x86 Vishal Verma
2026-03-24 10:03 ` Chao Gao
2026-03-30 11:42 ` Kiryl Shutsemau
2026-03-31 19:22 ` Sean Christopherson
2026-03-31 22:21 ` Edgecombe, Rick P
2026-03-31 23:04 ` Sean Christopherson
2026-03-31 23:29 ` Edgecombe, Rick P
2026-04-01 15:03 ` Dave Hansen
2026-04-01 17:42 ` H. Peter Anvin
2026-04-01 18:12 ` Sean Christopherson
2026-04-01 18:30 ` Dave Hansen
2026-03-23 20:59 ` [PATCH v2 3/5] x86/virt/tdx: Add SEAMCALL wrapper for TDH.SYS.DISABLE Vishal Verma
2026-03-23 21:54 ` Verma, Vishal L
2026-03-23 22:40 ` Huang, Kai
2026-03-24 10:18 ` Chao Gao
2026-03-30 11:58 ` Kiryl Shutsemau
2026-03-30 19:25 ` Edgecombe, Rick P
2026-03-31 12:18 ` Kiryl Shutsemau [this message]
2026-03-31 18:22 ` Verma, Vishal L
2026-03-31 21:36 ` Edgecombe, Rick P
2026-04-01 9:26 ` Kiryl Shutsemau
2026-04-01 14:24 ` Dave Hansen
2026-03-23 20:59 ` [PATCH v2 4/5] x86/tdx: Disable the TDX module during kexec and kdump Vishal Verma
2026-03-23 22:41 ` Huang, Kai
2026-03-30 12:03 ` Kiryl Shutsemau
2026-03-23 20:59 ` [PATCH v2 5/5] x86/virt/tdx: Remove kexec docs Vishal Verma
2026-03-23 22:41 ` Huang, Kai
2026-03-30 12:04 ` Kiryl Shutsemau
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