Re: [PATCH v12 17/29] KVM: SEV: Add support to handle RMP nested page faults

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On 3/29/24 23:58, Michael Roth wrote:
+	if (rmp_level == PG_LEVEL_4K) {
+		pr_debug_ratelimited("%s: Spurious RMP fault for GPA 0x%llx, error_code 0x%llx",
+				     __func__, gpa, error_code);
+		goto out;
+	}
+	pr_debug_ratelimited("%s: Splitting 2M RMP entry for GPA 0x%llx, error_code 0x%llx",
+			     __func__, gpa, error_code);
+	ret = snp_rmptable_psmash(pfn);
+	if (ret && ret != PSMASH_FAIL_INUSE) {
+		/*
+		 * Look it up again. If it's 4K now then the PSMASH may have raced with
+		 * another process and the issue has already resolved itself.
+		 */
+		if (!snp_lookup_rmpentry(pfn, &assigned, &rmp_level) && assigned &&
+		    rmp_level == PG_LEVEL_4K) {
+			pr_debug_ratelimited("%s: PSMASH for GPA 0x%llx failed with ret %d due to potential race",
+					     __func__, gpa, ret);
+			goto out;
+		}

Please change these pr_debug_ratelimited() to just a single trace point after the call to snp_rmptable_psmash().


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