linux-kernel - [PATCH v1 3/4] mm: Change ghes code to allow poison of non-struct pfn

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Message-ID: <20230920140210.12663-4-ankita@nvidia.com>
Date:   Wed, 20 Sep 2023 19:32:09 +0530
From:   <ankita@...dia.com>
To:     <ankita@...dia.com>, <jgg@...dia.com>,
        <alex.williamson@...hat.com>, <akpm@...ux-foundation.org>,
        <tony.luck@...el.com>, <bp@...en8.de>, <naoya.horiguchi@....com>,
        <linmiaohe@...wei.com>
CC:     <aniketa@...dia.com>, <cjia@...dia.com>, <kwankhede@...dia.com>,
        <targupta@...dia.com>, <vsethi@...dia.com>, <acurrid@...dia.com>,
        <anuaggarwal@...dia.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-edac@...r.kernel.org>,
        <kvm@...r.kernel.org>
Subject: [PATCH v1 3/4] mm: Change ghes code to allow poison of non-struct pfn

From: Ankit Agrawal <ankita@...dia.com>

The GHES code allows calling of memory_failure() on the PFNs that pass the
pfn_valid() check. This contract is broken for the remapped PFNs which
fails the check and ghes_do_memory_failure() returns without triggering
memory_failure().

Update code to allow memory_failure() call on PFNs failing pfn_valid().

Signed-off-by: Ankit Agrawal <ankita@...dia.com>
---
 drivers/acpi/apei/ghes.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index ef59d6ea16da..6ad1e4cbc968 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -457,20 +457,10 @@ static void ghes_kick_task_work(struct callback_head *head)
 
 static bool ghes_do_memory_failure(u64 physical_addr, int flags)
 {
-	unsigned long pfn;
-
 	if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
 		return false;
 
-	pfn = PHYS_PFN(physical_addr);
-	if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
-		pr_warn_ratelimited(FW_WARN GHES_PFX
-		"Invalid address in generic error data: %#llx\n",
-		physical_addr);
-		return false;
-	}
-
-	memory_failure_queue(pfn, flags);
+	memory_failure_queue(PHYS_PFN(physical_addr), flags);
 	return true;
 }
 
-- 
2.17.1