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x86/virt/sev: Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN

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WBINVD is required before SNP_INIT(_EX), but not before setting
MSR_AMD64_SYSCFG_SNP_EN, since the ccp driver already does its own WBINVD
before SNP_INIT (and this one would be too early for that anyway...).

Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://patch.msgid.link/20260309180053.2389118-3-tycho@kernel.org
This commit is contained in:
Tycho Andersen (AMD) 2026-03-09 12:00:44 -06:00 committed by Borislav Petkov (AMD)
parent 959d3f7565
commit 99cf1fb58e
1 changed files with 0 additions and 3 deletions
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3
arch/x86/virt/svm/sev.c
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@ -524,9 +524,6 @@ int __init snp_rmptable_init(void)
memset(desc->rmp_entry, 0, desc->size);
}
/* Flush the caches to ensure that data is written before SNP is enabled. */
wbinvd_on_all_cpus();
/* MtrrFixDramModEn must be enabled on all the CPUs prior to enabling SNP. */
on_each_cpu(mfd_enable, NULL, 1);