From patchwork Fri Apr 12 14:21:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13627836 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83DE686AC4 for ; Fri, 12 Apr 2024 14:22:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712931738; cv=none; b=mFhHMAG2WDlHP2AO24kJ9nGL9jEAc5UrOBCi6/XRAbqHofu5nN5faov8tYdFPWsLL6WcmHBpDlO8E2RS5H2+jK5At+xCyEfFnqztd2pJhk3c2LCe+dgqFKT65MMPy/sBnjdE3qsLTwRW8pUXMQbxncDKBBRWRMQlXvMBiuzZMRM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712931738; c=relaxed/simple; bh=/tXyzOYyw4pq31cL1FFyaL3wPXVZ/5m/14BG0LXOZEM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZU0FTHqah9vOmAGEeWhAiiWLCl9Mgtq+ytY38eNcJL5Y3J4oN1BLwvWyks4lK0QkcXVLVbhz5Jx3+9MwMfZXRzHCuf6NH1fIMDJmLSCGpUj8JCdscyPW+PEFeUxTXdyG+rK+pqiO7YL+LtU7RkXgVDoBsOjdtjvWHLfrABk2KxI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=WoVtKGjP; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="WoVtKGjP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712931735; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MbXbQefcOAyCyrQA8FaYb/pxsfcbT6vaazXi8Pr/n4g=; b=WoVtKGjPb6+QzCPhdHc7Y0bhP8UfNMRnNp0TdDIvWyrthD7v5PF5vQGnR9JILzJBIDBIDS JUIg/Tj+9NFUgHZixgvXbFf/SZh5mwalTalduRzo4uTpq7tEQcR/0YupOFYU83JRVcGzug XEQjKroEqbQFV1/1YQ2AsKq7qSvoqJQ= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-621-BXEQ_7SlMmigl_EDAZ0XiQ-1; Fri, 12 Apr 2024 10:22:10 -0400 X-MC-Unique: BXEQ_7SlMmigl_EDAZ0XiQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 940EB29AB3EE; Fri, 12 Apr 2024 14:22:09 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.39.193.165]) by smtp.corp.redhat.com (Postfix) with ESMTP id BB36240C6CC0; Fri, 12 Apr 2024 14:22:06 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Janosch Frank , Claudio Imbrenda , Gerald Schaefer , Matthew Wilcox , Thomas Huth Subject: [PATCH v2 07/10] s390/uv: convert uv_destroy_owned_page() to uv_destroy_(folio|pte)() Date: Fri, 12 Apr 2024 16:21:17 +0200 Message-ID: <20240412142120.220087-8-david@redhat.com> In-Reply-To: <20240412142120.220087-1-david@redhat.com> References: <20240412142120.220087-1-david@redhat.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Let's have the following variants for destroying pages: (1) uv_destroy(): Like uv_pin_shared() and uv_convert_from_secure(), "low level" helper that operates on paddr and doesn't mess with folios. (2) uv_destroy_folio(): Consumes a folio to which we hold a reference. (3) uv_destroy_pte(): Consumes a PTE that holds a reference through the mapping. Unfortunately we need uv_destroy_pte(), because pfn_folio() and friends are not available in pgtable.h. Signed-off-by: David Hildenbrand Reviewed-by: Claudio Imbrenda --- arch/s390/include/asm/pgtable.h | 2 +- arch/s390/include/asm/uv.h | 10 ++++++++-- arch/s390/kernel/uv.c | 24 +++++++++++++++++------- arch/s390/mm/gmap.c | 6 ++++-- 4 files changed, 30 insertions(+), 12 deletions(-) diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 60950e7a25f5..97e040617c29 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1199,7 +1199,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, * The notifier should have destroyed all protected vCPUs at this * point, so the destroy should be successful. */ - if (full && !uv_destroy_owned_page(pte_val(res) & PAGE_MASK)) + if (full && !uv_destroy_pte(res)) return res; /* * If something went wrong and the page could not be destroyed, or diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index d2205ff97007..a1bef30066ef 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -483,7 +483,8 @@ static inline int is_prot_virt_host(void) int uv_pin_shared(unsigned long paddr); int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb); int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr); -int uv_destroy_owned_page(unsigned long paddr); +int uv_destroy_folio(struct folio *folio); +int uv_destroy_pte(pte_t pte); int uv_convert_owned_from_secure(unsigned long paddr); int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr); @@ -497,7 +498,12 @@ static inline int uv_pin_shared(unsigned long paddr) return 0; } -static inline int uv_destroy_owned_page(unsigned long paddr) +static inline int uv_destroy_folio(struct folio *folio) +{ + return 0; +} + +static inline int uv_destroy_pte(pte_t pte) { return 0; } diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index 3d3250b406a6..61c1ce51c883 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -110,7 +110,7 @@ EXPORT_SYMBOL_GPL(uv_pin_shared); * * @paddr: Absolute host address of page to be destroyed */ -static int uv_destroy_page(unsigned long paddr) +static int uv_destroy(unsigned long paddr) { struct uv_cb_cfs uvcb = { .header.cmd = UVC_CMD_DESTR_SEC_STOR, @@ -131,11 +131,10 @@ static int uv_destroy_page(unsigned long paddr) } /* - * The caller must already hold a reference to the page + * The caller must already hold a reference to the folio */ -int uv_destroy_owned_page(unsigned long paddr) +int uv_destroy_folio(struct folio *folio) { - struct folio *folio = phys_to_folio(paddr); int rc; /* See gmap_make_secure(): large folios cannot be secure */ @@ -143,13 +142,22 @@ int uv_destroy_owned_page(unsigned long paddr) return 0; folio_get(folio); - rc = uv_destroy_page(paddr); + rc = uv_destroy(folio_to_phys(folio)); if (!rc) clear_bit(PG_arch_1, &folio->flags); folio_put(folio); return rc; } +/* + * The present PTE still indirectly holds a folio reference through the mapping. + */ +int uv_destroy_pte(pte_t pte) +{ + VM_WARN_ON(!pte_present(pte)); + return uv_destroy_folio(pfn_folio(pte_pfn(pte))); +} + /* * Requests the Ultravisor to encrypt a guest page and make it * accessible to the host for paging (export). @@ -437,6 +445,7 @@ int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr) { struct vm_area_struct *vma; unsigned long uaddr; + struct folio *folio; struct page *page; int rc; @@ -460,7 +469,8 @@ int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr) page = follow_page(vma, uaddr, FOLL_WRITE | FOLL_GET); if (IS_ERR_OR_NULL(page)) goto out; - rc = uv_destroy_owned_page(page_to_phys(page)); + folio = page_folio(page); + rc = uv_destroy_folio(folio); /* * Fault handlers can race; it is possible that two CPUs will fault * on the same secure page. One CPU can destroy the page, reboot, @@ -472,7 +482,7 @@ int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr) */ if (rc) rc = uv_convert_owned_from_secure(page_to_phys(page)); - put_page(page); + folio_put(folio); out: mmap_read_unlock(gmap->mm); return rc; diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 094b43b121cd..0351cb139df4 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2756,13 +2756,15 @@ static const struct mm_walk_ops gather_pages_ops = { */ void s390_uv_destroy_pfns(unsigned long count, unsigned long *pfns) { + struct folio *folio; unsigned long i; for (i = 0; i < count; i++) { + folio = pfn_folio(pfns[i]); /* we always have an extra reference */ - uv_destroy_owned_page(pfn_to_phys(pfns[i])); + uv_destroy_folio(folio); /* get rid of the extra reference */ - put_page(pfn_to_page(pfns[i])); + folio_put(folio); cond_resched(); } }