From: vsntk18@gmail.com
To: x86@kernel.org
Cc: cfir@google.com, dan.j.williams@intel.com,
dave.hansen@linux.intel.com, ebiederm@xmission.com,
erdemaktas@google.com, hpa@zytor.com, jgross@suse.com,
jroedel@suse.de, jslaby@suse.cz, keescook@chromium.org,
kexec@lists.infradead.org, kvm@vger.kernel.org,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
luto@kernel.org, martin.b.radev@gmail.com, mhiramat@kernel.org,
mstunes@vmware.com, nivedita@alum.mit.edu, peterz@infradead.org,
rientjes@google.com, seanjc@google.com, stable@vger.kernel.org,
thomas.lendacky@amd.com,
virtualization@lists.linux-foundation.org, vkarasulli@suse.de,
ashish.kalra@amd.com, michael.roth@amd.com,
Borislav.Petkov@amd.com, Dhaval.Giani@amd.com
Subject: [PATCH v5 10/10] x86/sev: Exclude AP jump table related code for SEV-SNP guests
Date: Mon, 8 Apr 2024 09:40:49 +0200 [thread overview]
Message-ID: <20240408074049.7049-11-vsntk18@gmail.com> (raw)
In-Reply-To: <20240408074049.7049-1-vsntk18@gmail.com>
From: Vasant Karasulli <vkarasulli@suse.de>
Unlike SEV-ES, AP jump table technique is not used in SEV-SNP
when transitioning from one layer of code to another
(e.g. when going from UEFI to the OS).
Signed-off-by: Vasant Karasulli <vkarasulli@suse.de>
---
arch/x86/kernel/sev.c | 6 +++++-
arch/x86/realmode/init.c | 5 +++--
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index aa53e8eb4cd5..d915d9158926 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1392,7 +1392,8 @@ STACK_FRAME_NON_STANDARD(sev_jumptable_ap_park);
void sev_es_stop_this_cpu(void)
{
if (!(cc_vendor == CC_VENDOR_AMD) ||
- !cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
+ !cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT) ||
+ cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return;
/* Only park in the AP jump table when the code has been installed */
@@ -1468,6 +1469,9 @@ bool sev_kexec_supported(void)
if (!cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
return true;
+ if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
+ return false;
+
/*
* KEXEC with SEV-ES and more than one CPU is only supported
* when the AP jump table is installed.
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index f9bc444a3064..ed798939be5d 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -80,8 +80,9 @@ static void __init sme_sev_setup_real_mode(struct trampoline_header *th)
*/
th->start = (u64) secondary_startup_64_no_verify;
- if (sev_es_setup_ap_jump_table(real_mode_header))
- panic("Failed to get/update SEV-ES AP Jump Table");
+ if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
+ if (sev_es_setup_ap_jump_table(real_mode_header))
+ panic("Failed to get/update SEV-ES AP Jump Table");
}
#endif
}
--
2.34.1
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
prev parent reply other threads:[~2024-04-08 7:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-08 7:40 [PATCH v5 00/10] x86/sev: KEXEC/KDUMP support for SEV-ES guests vsntk18
2024-04-08 7:40 ` [PATCH v5 01/10] x86/kexec/64: Disable kexec when SEV-ES is active vsntk18
2024-04-08 7:40 ` [PATCH v5 02/10] x86/sev: Save and print negotiated GHCB protocol version vsntk18
2024-04-08 7:40 ` [PATCH v5 03/10] x86/sev: Set GHCB data structure version vsntk18
2024-04-08 7:40 ` [PATCH v5 04/10] x86/sev: Setup code to park APs in the AP Jump Table vsntk18
2024-04-08 7:40 ` [PATCH v5 05/10] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 vsntk18
2024-04-08 7:40 ` [PATCH v5 06/10] x86/sev: Use AP Jump Table blob to stop CPU vsntk18
2024-04-08 7:40 ` [PATCH v5 07/10] x86/sev: Add MMIO handling support to boot/compressed/ code vsntk18
2024-04-08 7:40 ` [PATCH v5 08/10] x86/sev: Handle CLFLUSH MMIO events vsntk18
2024-04-08 7:40 ` [PATCH v5 09/10] x86/kexec/64: Support kexec under SEV-ES with AP Jump Table Blob vsntk18
2024-04-08 7:40 ` vsntk18 [this message]
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=20240408074049.7049-11-vsntk18@gmail.com \
--to=vsntk18@gmail.com \
--cc=Borislav.Petkov@amd.com \
--cc=Dhaval.Giani@amd.com \
--cc=ashish.kalra@amd.com \
--cc=cfir@google.com \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=ebiederm@xmission.com \
--cc=erdemaktas@google.com \
--cc=hpa@zytor.com \
--cc=jgross@suse.com \
--cc=jroedel@suse.de \
--cc=jslaby@suse.cz \
--cc=keescook@chromium.org \
--cc=kexec@lists.infradead.org \
--cc=kvm@vger.kernel.org \
--cc=linux-coco@lists.linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=martin.b.radev@gmail.com \
--cc=mhiramat@kernel.org \
--cc=michael.roth@amd.com \
--cc=mstunes@vmware.com \
--cc=nivedita@alum.mit.edu \
--cc=peterz@infradead.org \
--cc=rientjes@google.com \
--cc=seanjc@google.com \
--cc=stable@vger.kernel.org \
--cc=thomas.lendacky@amd.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=vkarasulli@suse.de \
--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;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).