[PATCH 2/6] vmw_balloon: support 64-bit memory limit

Nadav Amit
2019-02-06T23:57:41Z

From: Xavier Deguillard <xdeguillard@vmware.com>

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>
---
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);
--
2.17.1