From: "tip-bot2 for Joerg Roedel" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Joerg Roedel <jroedel@suse.de>, Borislav Petkov <bp@suse.de>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/seves] x86/boot/compressed/64: Reload CS in startup_32
Date: Thu, 18 Mar 2021 19:34:34 -0000 [thread overview]
Message-ID: <161609607491.398.1040399144606674357.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210312123824.306-4-joro@8bytes.org>
The following commit has been merged into the x86/seves branch of tip:
Commit-ID: 0c289ff81c24033777fab23019039f11e1449ba4
Gitweb: https://git.kernel.org/tip/0c289ff81c24033777fab23019039f11e1449ba4
Author: Joerg Roedel <jroedel@suse.de>
AuthorDate: Wed, 10 Mar 2021 09:43:20 +01:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 18 Mar 2021 16:44:43 +01:00
x86/boot/compressed/64: Reload CS in startup_32
Exception handling in the startup_32 boot path requires the CS
selector to be correctly set up. Reload it from the current GDT.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210312123824.306-4-joro@8bytes.org
---
arch/x86/boot/compressed/head_64.S | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index e94874f..c59c80c 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -107,9 +107,16 @@ SYM_FUNC_START(startup_32)
movl %eax, %gs
movl %eax, %ss
-/* setup a stack and make sure cpu supports long mode. */
+ /* Setup a stack and load CS from current GDT */
leal rva(boot_stack_end)(%ebp), %esp
+ pushl $__KERNEL32_CS
+ leal rva(1f)(%ebp), %eax
+ pushl %eax
+ lretl
+1:
+
+ /* Make sure cpu supports long mode. */
call verify_cpu
testl %eax, %eax
jnz .Lno_longmode
next prev parent reply other threads:[~2021-03-18 19:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 12:38 [PATCH v3 0/8] x86/seves: Support 32-bit boot path and other updates Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 1/8] x86/boot/compressed/64: Cleanup exception handling before booting kernel Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 2/8] x86/sev: Do not require Hypervisor CPUID bit for SEV guests Joerg Roedel
2021-03-17 15:04 ` Tom Lendacky
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 3/8] x86/boot/compressed/64: Reload CS in startup_32 Joerg Roedel
2021-03-18 19:34 ` tip-bot2 for Joerg Roedel [this message]
2021-03-12 12:38 ` [PATCH v3 4/8] x86/boot/compressed/64: Setup IDT in startup_32 boot path Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 5/8] x86/boot/compressed/64: Add 32-bit boot #VC handler Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-18 22:10 ` tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 6/8] x86/boot/compressed/64: Add CPUID sanity check to 32-bit boot-path Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-18 22:10 ` tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 7/8] x86/boot/compressed/64: Check SEV encryption in " Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] x86/boot/compressed/64: Check SEV encryption in the " tip-bot2 for Joerg Roedel
2021-03-18 22:10 ` tip-bot2 for Joerg Roedel
2021-03-12 12:38 ` [PATCH v3 8/8] x86/sev-es: Replace open-coded hlt-loops with sev_es_terminate() Joerg Roedel
2021-03-18 19:34 ` [tip: x86/seves] " tip-bot2 for Joerg Roedel
2021-03-18 22:10 ` tip-bot2 for Joerg Roedel
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