From 5539830278fa96b9e78030ad80f9f4cfc3dc29e1 Mon Sep 17 00:00:00 2001 From: Xavier Deguillard Date: Wed, 6 Feb 2019 15:57:02 -0800 Subject: [PATCH] vmw_balloon: support 64-bit memory limit Currently, the balloon driver would fail to run if memory is greater than 16TB of vRAM. Previous patches have already converted the balloon target and size to 64-bit, so all that is left to do add is to avoid asserting memory is smaller than 16TB if the hypervisor supports 64-bits target. The driver advertises a new capability VMW_BALLOON_64_BITS_TARGET. Hypervisors that support 16TB of memory or more will report that this capability is enabled. Signed-off-by: Xavier Deguillard Signed-off-by: Nadav Amit Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_balloon.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index c4371ec132d3..f96dc3690ade 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -72,15 +72,26 @@ enum vmwballoon_capabilities { VMW_BALLOON_BATCHED_CMDS = (1 << 2), VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3), VMW_BALLOON_SIGNALLED_WAKEUP_CMD = (1 << 4), + VMW_BALLOON_64_BIT_TARGET = (1 << 5) }; -#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS \ +#define VMW_BALLOON_CAPABILITIES_COMMON (VMW_BALLOON_BASIC_CMDS \ | VMW_BALLOON_BATCHED_CMDS \ | VMW_BALLOON_BATCHED_2M_CMDS \ | VMW_BALLOON_SIGNALLED_WAKEUP_CMD) #define VMW_BALLOON_2M_ORDER (PMD_SHIFT - PAGE_SHIFT) +/* + * 64-bit targets are only supported in 64-bit + */ +#ifdef CONFIG_64BIT +#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_CAPABILITIES_COMMON \ + | VMW_BALLOON_64_BIT_TARGET) +#else +#define VMW_BALLOON_CAPABILITIES VMW_BALLOON_CAPABILITIES_COMMON +#endif + enum vmballoon_page_size_type { VMW_BALLOON_4K_PAGE, VMW_BALLOON_2M_PAGE, @@ -571,8 +582,9 @@ static int vmballoon_send_get_target(struct vmballoon *b) limit = totalram_pages(); - /* Ensure limit fits in 32-bits */ - if (limit != (u32)limit) + /* Ensure limit fits in 32-bits if 64-bit targets are not supported */ + if (!(b->capabilities & VMW_BALLOON_64_BIT_TARGET) && + limit != (u32)limit) return -EINVAL; status = vmballoon_cmd(b, VMW_BALLOON_CMD_GET_TARGET, limit, 0); -- 2.30.2