Withdraw the memory from a finalized partition and free the pages.
The partition is now cleaned up correctly when the fd is released.
Co-developed-by: Lillian Grassin-Drake <ligra...@microsoft.com>
Signed-off-by: Lillian Grassin-Drake <ligra...@microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasne...@linux.microsoft.com>
---
include/asm-generic/hyperv-tlfs.h | 10 ++++++
virt/mshv/mshv_main.c | 54 ++++++++++++++++++++++++++++++-
2 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/include/asm-generic/hyperv-tlfs.h
b/include/asm-generic/hyperv-tlfs.h
index ab6ae6c164f5..2a49503b7396 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -148,6 +148,7 @@ struct ms_hyperv_tsc_page {
#define HVCALL_DELETE_PARTITION 0x0043
#define HVCALL_GET_PARTITION_ID 0x0046
#define HVCALL_DEPOSIT_MEMORY 0x0048
+#define HVCALL_WITHDRAW_MEMORY 0x0049
#define HVCALL_CREATE_VP 0x004e
#define HVCALL_GET_VP_REGISTERS 0x0050
#define HVCALL_SET_VP_REGISTERS 0x0051
@@ -472,6 +473,15 @@ union hv_proximity_domain_info {
u64 as_uint64;
};
+struct hv_withdraw_memory_in {
+ u64 partition_id;
+ union hv_proximity_domain_info proximity_domain_info;
+};
+
+struct hv_withdraw_memory_out {
+ u64 gpa_page_list[0];
+};
+
struct hv_lp_startup_status {
u64 hv_status;
u64 substatus1;
diff --git a/virt/mshv/mshv_main.c b/virt/mshv/mshv_main.c
index c4130a6508e5..162a1bb42a4a 100644
--- a/virt/mshv/mshv_main.c
+++ b/virt/mshv/mshv_main.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/anon_inodes.h>
+#include <linux/mm.h>
#include <linux/mshv.h>
#include <asm/mshyperv.h>
@@ -57,8 +58,58 @@ static struct miscdevice mshv_dev = {
.mode = 600,
};
+#define HV_WITHDRAW_BATCH_SIZE (PAGE_SIZE / sizeof(u64))
#define HV_INIT_PARTITION_DEPOSIT_PAGES 208
+static int
+hv_call_withdraw_memory(u64 count, int node, u64 partition_id)
+{
+ struct hv_withdraw_memory_in *input_page;
+ struct hv_withdraw_memory_out *output_page;
+ u16 completed;
+ u64 hypercall_status;
+ unsigned long remaining = count;
+ int status;
+ int i;
+ unsigned long flags;
+
+ while (remaining) {
+ local_irq_save(flags);
+
+ input_page = (struct hv_withdraw_memory_in *)(*this_cpu_ptr(
+ hyperv_pcpu_input_arg));
+ output_page = (struct hv_withdraw_memory_out *)(*this_cpu_ptr(
+ hyperv_pcpu_output_arg));
+
+ input_page->partition_id = partition_id;
+ input_page->proximity_domain_info.as_uint64 = 0;
+ hypercall_status = hv_do_rep_hypercall(
+ HVCALL_WITHDRAW_MEMORY,
+ min(remaining, HV_WITHDRAW_BATCH_SIZE), 0, input_page,
+ output_page);
+
+ completed = (hypercall_status & HV_HYPERCALL_REP_COMP_MASK) >>
+ HV_HYPERCALL_REP_COMP_OFFSET;
+
+ for (i = 0; i < completed; i++)
+ __free_page(pfn_to_page(output_page->gpa_page_list[i]));
+
+ local_irq_restore(flags);
+
+ status = hypercall_status & HV_HYPERCALL_RESULT_MASK;
+ if (status != HV_STATUS_SUCCESS) {
+ if (status != HV_STATUS_NO_RESOURCES)
+ pr_err("%s: %s\n", __func__,
+ hv_status_to_string(status));
+ break;
+ }
+
+ remaining -= completed;
+ }
+
+ return -hv_status_to_errno(status);
+}
+
static int
hv_call_create_partition(
u64 flags,
@@ -230,7 +281,8 @@ destroy_partition(struct mshv_partition *partition)
/* Deallocates and unmaps everything including vcpus, GPA mappings etc
*/
hv_call_finalize_partition(partition->id);
- /* TODO: Withdraw and free all pages we deposited */
+ /* Withdraw and free all pages we deposited */
+ hv_call_withdraw_memory(U64_MAX, NUMA_NO_NODE, partition->id);
hv_call_delete_partition(partition->id);
--
2.25.1
