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Message-ID: <170133716855.398.4806769836355142687.tip-bot2@tip-bot2>
Date: Thu, 30 Nov 2023 09:39:28 -0000
From: "tip-bot2 for Ashwin Dayanand Kamat" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Tom Lendacky <thomas.lendacky@....com>,
Bo Gan <bo.gan@...adcom.com>,
Ashwin Dayanand Kamat <ashwin.kamat@...adcom.com>,
Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/sev: Fix kernel crash due to late update to
read-only ghcb_version
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 27d25348d42161837be08fc63b04a2559d2e781c
Gitweb: https://git.kernel.org/tip/27d25348d42161837be08fc63b04a2559d2e781c
Author: Ashwin Dayanand Kamat <ashwin.kamat@...adcom.com>
AuthorDate: Wed, 29 Nov 2023 16:10:29 +05:30
Committer: Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 30 Nov 2023 10:23:12 +01:00
x86/sev: Fix kernel crash due to late update to read-only ghcb_version
A write-access violation page fault kernel crash was observed while running
cpuhotplug LTP testcases on SEV-ES enabled systems. The crash was
observed during hotplug, after the CPU was offlined and the process
was migrated to different CPU. setup_ghcb() is called again which
tries to update ghcb_version in sev_es_negotiate_protocol(). Ideally this
is a read_only variable which is initialised during booting.
Trying to write it results in a pagefault:
BUG: unable to handle page fault for address: ffffffffba556e70
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
[ ...]
Call Trace:
<TASK>
? __die_body.cold+0x1a/0x1f
? __die+0x2a/0x35
? page_fault_oops+0x10c/0x270
? setup_ghcb+0x71/0x100
? __x86_return_thunk+0x5/0x6
? search_exception_tables+0x60/0x70
? __x86_return_thunk+0x5/0x6
? fixup_exception+0x27/0x320
? kernelmode_fixup_or_oops+0xa2/0x120
? __bad_area_nosemaphore+0x16a/0x1b0
? kernel_exc_vmm_communication+0x60/0xb0
? bad_area_nosemaphore+0x16/0x20
? do_kern_addr_fault+0x7a/0x90
? exc_page_fault+0xbd/0x160
? asm_exc_page_fault+0x27/0x30
? setup_ghcb+0x71/0x100
? setup_ghcb+0xe/0x100
cpu_init_exception_handling+0x1b9/0x1f0
The fix is to call sev_es_negotiate_protocol() only in the BSP boot phase,
and it only needs to be done once in any case.
[ mingo: Refined the changelog. ]
Fixes: 95d33bfaa3e1 ("x86/sev: Register GHCB memory when SEV-SNP is active")
Suggested-by: Tom Lendacky <thomas.lendacky@....com>
Co-developed-by: Bo Gan <bo.gan@...adcom.com>
Signed-off-by: Bo Gan <bo.gan@...adcom.com>
Signed-off-by: Ashwin Dayanand Kamat <ashwin.kamat@...adcom.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Tom Lendacky <thomas.lendacky@....com>
Link: https://lore.kernel.org/r/1701254429-18250-1-git-send-email-kashwindayan@vmware.com
---
arch/x86/kernel/sev.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 70472ee..c672858 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1234,10 +1234,6 @@ void setup_ghcb(void)
if (!cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
return;
- /* First make sure the hypervisor talks a supported protocol. */
- if (!sev_es_negotiate_protocol())
- sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ);
-
/*
* Check whether the runtime #VC exception handler is active. It uses
* the per-CPU GHCB page which is set up by sev_es_init_vc_handling().
@@ -1255,6 +1251,13 @@ void setup_ghcb(void)
}
/*
+ * Make sure the hypervisor talks a supported protocol.
+ * This gets called only in the BSP boot phase.
+ */
+ if (!sev_es_negotiate_protocol())
+ sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ);
+
+ /*
* Clear the boot_ghcb. The first exception comes in before the bss
* section is cleared.
*/
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