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vmw_balloon: support 64-bit memory limit

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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 <xdeguillard@vmware.com>
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xavier Deguillard 2019-02-06 15:57:02 -08:00 committed by Greg Kroah-Hartman
parent 47f8d9957d
commit 5539830278
1 changed files with 15 additions and 3 deletions
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18
drivers/misc/vmw_balloon.c
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@ -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);