Re: [PATCH v12 22/29] KVM: SEV: Implement gmem hook for invalidating private pages

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On 3/29/24 23:58, Michael Roth wrote:
+		/*
+		 * If an unaligned PFN corresponds to a 2M region assigned as a
+		 * large page in he RMP table, PSMASH the region into individual
+		 * 4K RMP entries before attempting to convert a 4K sub-page.
+		 */
+		if (!use_2m_update && rmp_level > PG_LEVEL_4K) {
+			rc = snp_rmptable_psmash(pfn);
+			if (rc)
+				pr_err_ratelimited("SEV: Failed to PSMASH RMP entry for PFN 0x%llx error %d\n",
+						   pfn, rc);
+		}

Ignoring the PSMASH failure is pretty scary... At this point .free_folio cannot fail, should the psmash part of this patch be done in kvm_gmem_invalidate_begin() before kvm_mmu_unmap_gfn_range()?

Also, can you get PSMASH_FAIL_INUSE and if so what's the best way to address it? Should fallocate() return -EBUSY?



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