Re: [PATCH v5 5/8] x86/sev: Map only the RMP table entries instead of the full RMP range

[Borislav Petkov]

On Mon, Oct 28, 2024 at 02:32:40PM -0500, Tom Lendacky wrote:
> @@ -224,7 +246,14 @@ static int __init snp_rmptable_init(void)
>  	if (val & MSR_AMD64_SYSCFG_SNP_EN)
>  		goto skip_enable;
>  
> -	memset(rmptable_start, 0, probed_rmp_size);
> +	/* Zero out the RMP bookkeeping area */
> +	if (!init_rmptable_bookkeeping()) {

So let's call it what it is then:

diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c
index 5871c924c0b2..8145a7b14fa2 100644
--- a/arch/x86/virt/svm/sev.c
+++ b/arch/x86/virt/svm/sev.c
@@ -173,7 +173,7 @@ void __init snp_fixup_e820_tables(void)
 	__snp_fixup_e820_tables(probed_rmp_base + probed_rmp_size);
 }
 
-static bool __init init_rmptable_bookkeeping(void)
+static bool __init clear_rmptable_bookkeeping(void)
 {
 	void *bk;
 
@@ -246,8 +246,7 @@ static int __init snp_rmptable_init(void)
 	if (val & MSR_AMD64_SYSCFG_SNP_EN)
 		goto skip_enable;
 
-	/* Zero out the RMP bookkeeping area */
-	if (!init_rmptable_bookkeeping()) {
+	if (!clear_rmptable_bookkeeping()) {
 		memunmap(rmptable_start);
 		goto nosnp;
 	}


-- 
Regards/Gruss,
    Boris.

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