linux-kernel - [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

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Message-Id: <1471547575-14748-1-git-send-email-mawilcox@linuxonhyperv.com>
Date:   Thu, 18 Aug 2016 12:12:54 -0700
From:   Matthew Wilcox <mawilcox@...uxonhyperv.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>
Subject: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

From: Matthew Wilcox <mawilcox@...rosoft.com>

The Generation 2 Hyper-V virtual machine does not emulate PCI.
This check causes the call to pcibios_resource_survey() to be skipped,
and pcibios_resource_survey() calls e820_reserve_resources_late(), which
is where PMEM resources are added to the resource tree.  With this patch,
the PMEM devices now show up.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 arch/x86/pci/common.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 7b6a9d1..d39e799 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -516,11 +516,6 @@ void __init pcibios_set_cache_line_size(void)
 
 int __init pcibios_init(void)
 {
-	if (!raw_pci_ops && !raw_pci_ext_ops) {
-		printk(KERN_WARNING "PCI: System does not support PCI\n");
-		return 0;
-	}
-
 	pcibios_set_cache_line_size();
 	pcibios_resource_survey();
 
-- 
2.8.1