From: "Huang, Kai" <kai.huang@intel.com>
To: Tom Lendacky <thomas.lendacky@amd.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<dave.hansen@intel.com>, <bp@alien8.de>, <tglx@linutronix.de>,
<mingo@redhat.com>, <hpa@zytor.com>, <luto@kernel.org>,
<peterz@infradead.org>, <rick.p.edgecombe@intel.com>,
<ashish.kalra@amd.com>, <chao.gao@intel.com>, <bhe@redhat.com>,
<nik.borisov@suse.com>, <pbonzini@redhat.com>,
<seanjc@google.com>
Subject: Re: [PATCH v2 2/5] x86/kexec: do unconditional WBINVD in relocate_kernel()
Date: Thu, 21 Mar 2024 09:48:28 +1300 [thread overview]
Message-ID: <e677ab03-8b25-46cd-90ac-cacae6ba5027@intel.com> (raw)
In-Reply-To: <5a2441a3-4d7e-4fee-bfa7-65b53376b0ab@amd.com>
>> Hi Tom,
>>
>> I am not aware of kexec() support status for SEV-ES/SEV-SNP guests.
>> Does patch 1 break them?
>
> SNP guests can kexec with some patches that are currently in process
> around shared to private memory conversions. ES guests can only kexec
> with a single vCPU. There was a recent patch series to add support for
> multiple vCPUs.
>
> Patch #1 doesn't break either ES or SNP because we still have an IDT and
> traditional kernel addressing in place, so the #VC can be handled.
How about plain SEV guest?
>
> Whereas patch #2 has switched to identity mapping and removed the IDT,
> so a #VC causes a triple fault.
That makes sense. Thanks.
Hi Kirill,
Does TDX guest have similar behaviour -- that WBINVD in stop_this_cpu()
can be handled although it causes #VE, while WBINVD in relocate_kernel()
will just triple fault the guest?
next prev parent reply other threads:[~2024-03-20 20:48 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-19 1:48 [PATCH v2 0/5] TDX host: kexec() support Kai Huang
2024-03-19 1:48 ` [PATCH v2 1/5] x86/kexec: do unconditional WBINVD in stop_this_cpu() Kai Huang
2024-03-19 1:48 ` [PATCH v2 2/5] x86/kexec: do unconditional WBINVD in relocate_kernel() Kai Huang
2024-03-19 11:13 ` Kirill A. Shutemov
2024-03-19 14:38 ` Tom Lendacky
2024-03-19 21:20 ` Huang, Kai
2024-03-20 0:19 ` Kirill A. Shutemov
2024-03-20 0:45 ` Huang, Kai
2024-03-20 12:51 ` Kirill A. Shutemov
2024-03-20 13:49 ` Tom Lendacky
2024-03-20 20:48 ` Huang, Kai [this message]
2024-03-20 21:06 ` Tom Lendacky
2024-03-20 21:58 ` Huang, Kai
2024-03-20 23:10 ` Kirill A. Shutemov
2024-03-21 21:02 ` Tom Lendacky
2024-03-22 10:40 ` Kirill A. Shutemov
2024-03-22 14:50 ` Tom Lendacky
2024-03-25 13:04 ` Huang, Kai
2024-03-28 16:10 ` kirill.shutemov
2024-04-01 9:13 ` Huang, Kai
2024-03-19 15:41 ` Borislav Petkov
2024-03-19 21:08 ` Huang, Kai
2024-03-19 1:48 ` [PATCH v2 3/5] x86/kexec: Reset TDX private memory on platforms with TDX erratum Kai Huang
2024-03-19 1:48 ` [PATCH v2 4/5] x86/virt/tdx: Remove the !KEXEC_CORE dependency Kai Huang
2024-03-19 1:48 ` [PATCH v2 5/5] x86/virt/tdx: Add TDX memory reset notifier to reset other private pages Kai Huang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e677ab03-8b25-46cd-90ac-cacae6ba5027@intel.com \
--to=kai.huang@intel.com \
--cc=ashish.kalra@amd.com \
--cc=bhe@redhat.com \
--cc=bp@alien8.de \
--cc=chao.gao@intel.com \
--cc=dave.hansen@intel.com \
--cc=hpa@zytor.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=nik.borisov@suse.com \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=rick.p.edgecombe@intel.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox