diff mbox series

[01/12] x86/ioremap: Fix page aligned size calculation in __ioremap_caller()

Message ID 1666288635-72591-2-git-send-email-mikelley@microsoft.com (mailing list archive)
State Superseded
Headers show
Series Add PCI pass-thru support to Hyper-V Confidential VMs | expand

Commit Message

Michael Kelley (LINUX) Oct. 20, 2022, 5:57 p.m. UTC 
If applying the PHYSICAL_PAGE_MASK to the phys_addr argument causes
upper bits to be masked out, the re-calculation of size to account for
page alignment is incorrect because the same bits are not masked out
in last_addr.

Fix this by masking the page aligned last_addr as well.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
 arch/x86/mm/ioremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 78c5bc6..0343de4 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -218,7 +218,7 @@  static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
 	 */
 	offset = phys_addr & ~PAGE_MASK;
 	phys_addr &= PHYSICAL_PAGE_MASK;
-	size = PAGE_ALIGN(last_addr+1) - phys_addr;
+	size = (PAGE_ALIGN(last_addr+1) & PHYSICAL_PAGE_MASK) - phys_addr;
 
 	retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
 						pcm, &new_pcm);