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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: linux-sgx@vger.kernel.org
Subject: [PATCH for_v25 4/4] x86/sgx: Pre-calculate VA slot virtual address in sgx_encl_ewb()
Date: Fri, 20 Dec 2019 16:31:56 -0800	[thread overview]
Message-ID: <20191221003156.27236-5-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20191221003156.27236-1-sean.j.christopherson@intel.com>

Now that sgx_epc_addr() is purely a calculation, calculate the VA slot
in sgx_encl_ewb() and pass it to __sgx_encl_ewb() to reduce line lengths
and avoid re-calculating the address on every EWB attempt.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kernel/cpu/sgx/reclaim.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/reclaim.c b/arch/x86/kernel/cpu/sgx/reclaim.c
index 030b1c24da07..a33f1c45477a 100644
--- a/arch/x86/kernel/cpu/sgx/reclaim.c
+++ b/arch/x86/kernel/cpu/sgx/reclaim.c
@@ -223,8 +223,7 @@ static void sgx_reclaimer_block(struct sgx_epc_page *epc_page)
 	mutex_unlock(&encl->lock);
 }
 
-static int __sgx_encl_ewb(struct sgx_epc_page *epc_page,
-			  struct sgx_va_page *va_page, unsigned int va_offset,
+static int __sgx_encl_ewb(struct sgx_epc_page *epc_page, void *va_slot,
 			  struct sgx_backing *backing)
 {
 	struct sgx_pageinfo pginfo;
@@ -237,8 +236,7 @@ static int __sgx_encl_ewb(struct sgx_epc_page *epc_page,
 	pginfo.metadata = (unsigned long)kmap_atomic(backing->pcmd) +
 			  backing->pcmd_offset;
 
-	ret = __ewb(&pginfo, sgx_epc_addr(epc_page),
-		    sgx_epc_addr(va_page->epc_page) + va_offset);
+	ret = __ewb(&pginfo, sgx_epc_addr(epc_page), va_slot);
 
 	kunmap_atomic((void *)(unsigned long)(pginfo.metadata -
 					      backing->pcmd_offset));
@@ -282,6 +280,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
 	struct sgx_encl *encl = encl_page->encl;
 	struct sgx_va_page *va_page;
 	unsigned int va_offset;
+	void *va_slot;
 	int ret;
 
 	encl_page->desc &= ~SGX_ENCL_PAGE_RECLAIMED;
@@ -289,10 +288,11 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
 	va_page = list_first_entry(&encl->va_pages, struct sgx_va_page,
 				   list);
 	va_offset = sgx_alloc_va_slot(va_page);
+	va_slot = sgx_epc_addr(va_page->epc_page) + va_offset;
 	if (sgx_va_page_full(va_page))
 		list_move_tail(&va_page->list, &encl->va_pages);
 
-	ret = __sgx_encl_ewb(epc_page, va_page, va_offset, backing);
+	ret = __sgx_encl_ewb(epc_page, va_slot, backing);
 	if (ret == SGX_NOT_TRACKED) {
 		ret = __etrack(sgx_epc_addr(encl->secs.epc_page));
 		if (ret) {
@@ -300,7 +300,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
 				ENCLS_WARN(ret, "ETRACK");
 		}
 
-		ret = __sgx_encl_ewb(epc_page, va_page, va_offset, backing);
+		ret = __sgx_encl_ewb(epc_page, va_slot, backing);
 		if (ret == SGX_NOT_TRACKED) {
 			/*
 			 * Slow path, send IPIs to kick cpus out of the
@@ -311,8 +311,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
 			 */
 			on_each_cpu_mask(sgx_encl_ewb_cpumask(encl),
 					 sgx_ipi_cb, NULL, 1);
-			ret = __sgx_encl_ewb(epc_page, va_page, va_offset,
-					     backing);
+			ret = __sgx_encl_ewb(epc_page, va_slot, backing);
 		}
 	}
 
-- 
2.24.1


  parent reply	other threads:[~2019-12-21  0:32 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-21  0:31 [PATCH for_v25 0/4] x86/sgx: Reclaim bug fix and cleanup Sean Christopherson
2019-12-21  0:31 ` [PATCH for_v25 1/4] x86/sgx: Put SECS backing iff retrieving the backing succeeds Sean Christopherson
2019-12-21  0:31 ` [PATCH for_v25 2/4] x86/sgx: Use goto to handle sgx_encl_get_backing() failure in SECS flows Sean Christopherson
2019-12-21  0:31 ` [PATCH for_v25 3/4] x86/sgx: Drop unused @encl parameter from __sgx_encl_ewb() Sean Christopherson
2019-12-21  0:31 ` Sean Christopherson [this message]
2020-01-02 17:06 ` [PATCH for_v25 0/4] x86/sgx: Reclaim bug fix and cleanup Jarkko Sakkinen

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