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Seongman Lee 7f5dc43b46 x86/sev: Fix operator precedence in GHCB_MSR_VMPL_REQ_LEVEL macro 
[ Upstream commit f7387eff4b ]

The GHCB_MSR_VMPL_REQ_LEVEL macro lacked parentheses around the bitmask
expression, causing the shift operation to bind too early. As a result,
when requesting VMPL1 (e.g., GHCB_MSR_VMPL_REQ_LEVEL(1)), incorrect
values such as 0x000000016 were generated instead of the intended
0x100000016 (the requested VMPL level is specified in GHCBData[39:32]).

Fix the precedence issue by grouping the masked value before applying
the shift.

  [ bp: Massage commit message. ]

Fixes: 34ff659017 ("x86/sev: Use kernel provided SVSM Calling Areas")
Signed-off-by: Seongman Lee <augustus92@kaist.ac.kr>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250511092329.12680-1-cloudlee1719@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-29 11:03:14 +02:00
..
asm x86/sev: Fix operator precedence in GHCB_MSR_VMPL_REQ_LEVEL macro 2025-05-29 11:03:14 +02:00
uapi/asm x86/headers: Replace __ASSEMBLY__ with __ASSEMBLER__ in UAPI headers 2025-05-29 11:02:11 +02:00