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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-sgx@vger.kernel.org
Cc: sean.j.christopherson@intel.com, serge.ayoun@intel.com,
	shay.katz-zamir@intel.com,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Subject: [PATCH 1/4] x86/sgx: Replace @is_secs_child with @pt in sgx_encl_ewb()
Date: Fri, 23 Aug 2019 19:16:13 +0300	[thread overview]
Message-ID: <20190823161616.27644-2-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20190823161616.27644-1-jarkko.sakkinen@linux.intel.com>

Sean complained about boolean parameters so I though that maybe it would
be good to rework the EWB flow in a way that it operates by a page type and
here is the result. The contract is and will be that as long as you give
the correct page type, you will get what you want. That is why I set
REG and TCS appropriately even though they are treated the same way
at this point of time.

Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/kernel/cpu/sgx/reclaim.c | 43 +++++++++++++++++++------------
 1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/reclaim.c b/arch/x86/kernel/cpu/sgx/reclaim.c
index 00f596c64a2d..3f10a8ff00b7 100644
--- a/arch/x86/kernel/cpu/sgx/reclaim.c
+++ b/arch/x86/kernel/cpu/sgx/reclaim.c
@@ -221,7 +221,7 @@ static void sgx_reclaimer_block(struct sgx_epc_page *epc_page)
 
 static int __sgx_encl_ewb(struct sgx_encl *encl, struct sgx_epc_page *epc_page,
 			  struct sgx_va_page *va_page, unsigned int va_offset,
-			  bool is_secs_child)
+			  unsigned int pt)
 {
 	struct sgx_encl_page *encl_page = epc_page->owner;
 	struct sgx_pageinfo pginfo;
@@ -232,10 +232,14 @@ static int __sgx_encl_ewb(struct sgx_encl *encl, struct sgx_epc_page *epc_page,
 	struct page *pcmd;
 	int ret;
 
-	if (is_secs_child)
-		page_index = SGX_ENCL_PAGE_INDEX(encl_page);
-	else
+	if (pt != SGX_SECINFO_SECS && pt != SGX_SECINFO_TCS &&
+	    pt != SGX_SECINFO_REG)
+		return -EINVAL;
+
+	if (pt == SGX_SECINFO_SECS)
 		page_index = PFN_DOWN(encl->size);
+	else
+		page_index = SGX_ENCL_PAGE_INDEX(encl_page);
 
 	pcmd_index = sgx_pcmd_index(encl, page_index);
 	pcmd_offset = sgx_pcmd_offset(page_index);
@@ -300,7 +304,7 @@ static const cpumask_t *sgx_encl_ewb_cpumask(struct sgx_encl *encl)
 	return cpumask;
 }
 
-static void sgx_encl_ewb(struct sgx_epc_page *epc_page, bool is_secs_child)
+static void sgx_encl_ewb(struct sgx_epc_page *epc_page, unsigned int pt)
 {
 	struct sgx_encl_page *encl_page = epc_page->owner;
 	struct sgx_encl *encl = encl_page->encl;
@@ -317,8 +321,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page, bool is_secs_child)
 		if (sgx_va_page_full(va_page))
 			list_move_tail(&va_page->list, &encl->va_pages);
 
-		ret = __sgx_encl_ewb(encl, epc_page, va_page, va_offset,
-				     is_secs_child);
+		ret = __sgx_encl_ewb(encl, epc_page, va_page, va_offset, pt);
 		if (ret == SGX_NOT_TRACKED) {
 			ret = __etrack(sgx_epc_addr(encl->secs.epc_page));
 			if (ret) {
@@ -327,8 +330,8 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page, bool is_secs_child)
 					ENCLS_WARN(ret, "ETRACK");
 			}
 
-			ret = __sgx_encl_ewb(encl, epc_page, va_page,
-					     va_offset, is_secs_child);
+			ret = __sgx_encl_ewb(encl, epc_page, va_page, va_offset,
+					     pt);
 			if (ret == SGX_NOT_TRACKED) {
 				/*
 				 * Slow path, send IPIs to kick cpus out of the
@@ -340,7 +343,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page, bool is_secs_child)
 				on_each_cpu_mask(sgx_encl_ewb_cpumask(encl),
 						 sgx_ipi_cb, NULL, 1);
 				ret = __sgx_encl_ewb(encl, epc_page, va_page,
-						     va_offset, is_secs_child);
+						     va_offset, pt);
 			}
 		}
 
@@ -350,12 +353,13 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page, bool is_secs_child)
 
 		encl_page->desc |= va_offset;
 		encl_page->va_page = va_page;
-	} else if (is_secs_child) {
+	} else if (pt != SGX_SECINFO_SECS) {
 		ret = __eremove(sgx_epc_addr(epc_page));
 		WARN(ret, "EREMOVE returned %d\n", ret);
 	}
 
-	if (!is_secs_child)
+	/* The reclaimer is not aware of SECS pages. */
+	if (pt == SGX_SECINFO_SECS)
 		sgx_free_page(epc_page);
 
 	encl_page->epc_page = NULL;
@@ -365,15 +369,22 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page)
 {
 	struct sgx_encl_page *encl_page = epc_page->owner;
 	struct sgx_encl *encl = encl_page->encl;
+	unsigned int pt;
+
+	if (encl_page->desc & SGX_ENCL_PAGE_TCS)
+		pt = SGX_SECINFO_TCS;
+	else
+		pt = SGX_SECINFO_REG;
 
 	mutex_lock(&encl->lock);
 
-	sgx_encl_ewb(epc_page, true);
+	sgx_encl_ewb(epc_page, pt);
+
 	encl->secs_child_cnt--;
+
 	if (!encl->secs_child_cnt &&
-	    (encl->flags & (SGX_ENCL_DEAD | SGX_ENCL_INITIALIZED))) {
-		sgx_encl_ewb(encl->secs.epc_page, false);
-	}
+	    (encl->flags & (SGX_ENCL_DEAD | SGX_ENCL_INITIALIZED)))
+		sgx_encl_ewb(encl->secs.epc_page, SGX_SECINFO_SECS);
 
 	mutex_unlock(&encl->lock);
 }
-- 
2.20.1


  reply	other threads:[~2019-08-23 16:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 16:16 [PATCH 0/4] Remaining updates for v22 Jarkko Sakkinen
2019-08-23 16:16 ` Jarkko Sakkinen [this message]
2019-08-26 14:31   ` [PATCH 1/4] x86/sgx: Replace @is_secs_child with @pt in sgx_encl_ewb() Ayoun, Serge
2019-08-26 16:25     ` Jarkko Sakkinen
2019-08-23 16:16 ` [PATCH 2/4] x86/sgx: Validate TCS permssions in sgx_validate_secinfo() Jarkko Sakkinen
2019-08-23 16:16 ` [PATCH 3/4] x86/sgx: Remove a deperecated enum Jarkko Sakkinen
2019-08-23 16:16 ` [PATCH 4/4] x86/sgx: Move VM prot bits calculation to sgx_encl_page_alloc() Jarkko Sakkinen
2019-08-23 21:53 ` [PATCH 0/4] Remaining updates for v22 Sean Christopherson
2019-08-26  5:39   ` Jarkko Sakkinen

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