From 0c55671f84fffe591e8435c93a8c83286fd6b8eb Mon Sep 17 00:00:00 2001 From: KarimAllah Ahmed Date: Thu, 31 Jan 2019 21:24:44 +0100 Subject: kvm, x86: Properly check whether a pfn is an MMIO or not pfn_valid check is not sufficient because it only checks if a page has a struct page or not, if "mem=" was passed to the kernel some valid pages won't have a struct page. This means that if guests were assigned valid memory that lies after the mem= boundary it will be passed uncached to the guest no matter what the guest caching attributes are for this memory. Introduce a new function e820__mapped_raw_any which is equivalent to e820__mapped_any but uses the original e820 unmodified and use it to identify real *RAM*. Signed-off-by: KarimAllah Ahmed Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/e820/api.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/include/asm/e820') diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h index 62be73b23d5c..e8f58ddd06d9 100644 --- a/arch/x86/include/asm/e820/api.h +++ b/arch/x86/include/asm/e820/api.h @@ -10,6 +10,7 @@ extern struct e820_table *e820_table_firmware; extern unsigned long pci_mem_start; +extern bool e820__mapped_raw_any(u64 start, u64 end, enum e820_type type); extern bool e820__mapped_any(u64 start, u64 end, enum e820_type type); extern bool e820__mapped_all(u64 start, u64 end, enum e820_type type); -- cgit v1.2.3-59-g8ed1b