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From: Nuno Das Neves <nunodasneves@linux.microsoft.com>
To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	prapal@linux.microsoft.com, easwar.hariharan@linux.microsoft.com,
	tiala@microsoft.com, anirudh@anirudhrb.com,
	paekkaladevi@linux.microsoft.com
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
	decui@microsoft.com, Jinank Jain <jinankjain@linux.microsoft.com>,
	Nuno Das Neves <nunodasneves@linux.microsoft.com>
Subject: [PATCH v3 4/5] mshv: Allocate vp state page for HVCALL_MAP_VP_STATE_PAGE on L1VH
Date: Tue, 16 Sep 2025 16:44:21 -0700	[thread overview]
Message-ID: <1758066262-15477-5-git-send-email-nunodasneves@linux.microsoft.com> (raw)
In-Reply-To: <1758066262-15477-1-git-send-email-nunodasneves@linux.microsoft.com>

From: Jinank Jain <jinankjain@linux.microsoft.com>

Introduce mshv_use_overlay_gpfn() to check if a page needs to be
allocated and passed to the hypervisor to map VP state pages. This is
only needed on L1VH, and only on some (newer) versions of the
hypervisor, hence the need to check vmm_capabilities.

Introduce functions hv_map/unmap_vp_state_page() to handle the
allocation and freeing.

Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
---
 drivers/hv/mshv_root.h         | 11 ++---
 drivers/hv/mshv_root_hv_call.c | 61 ++++++++++++++++++++++++---
 drivers/hv/mshv_root_main.c    | 76 +++++++++++++++++-----------------
 3 files changed, 98 insertions(+), 50 deletions(-)

diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h
index 0cb1e2589fe1..dbe2d1d0b22f 100644
--- a/drivers/hv/mshv_root.h
+++ b/drivers/hv/mshv_root.h
@@ -279,11 +279,12 @@ int hv_call_set_vp_state(u32 vp_index, u64 partition_id,
 			 /* Choose between pages and bytes */
 			 struct hv_vp_state_data state_data, u64 page_count,
 			 struct page **pages, u32 num_bytes, u8 *bytes);
-int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
-			      union hv_input_vtl input_vtl,
-			      struct page **state_page);
-int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
-				union hv_input_vtl input_vtl);
+int hv_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+			 union hv_input_vtl input_vtl,
+			 struct page **state_page);
+int hv_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+			   struct page *state_page,
+			   union hv_input_vtl input_vtl);
 int hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
 			u64 connection_partition_id, struct hv_port_info *port_info,
 			u8 port_vtl, u8 min_connection_vtl, int node);
diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c
index 3fd3cce23f69..98c6278ff151 100644
--- a/drivers/hv/mshv_root_hv_call.c
+++ b/drivers/hv/mshv_root_hv_call.c
@@ -526,9 +526,9 @@ int hv_call_set_vp_state(u32 vp_index, u64 partition_id,
 	return ret;
 }
 
-int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
-			      union hv_input_vtl input_vtl,
-			      struct page **state_page)
+static int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+				     union hv_input_vtl input_vtl,
+				     struct page **state_page)
 {
 	struct hv_input_map_vp_state_page *input;
 	struct hv_output_map_vp_state_page *output;
@@ -547,7 +547,14 @@ int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
 		input->type = type;
 		input->input_vtl = input_vtl;
 
-		status = hv_do_hypercall(HVCALL_MAP_VP_STATE_PAGE, input, output);
+		if (*state_page) {
+			input->flags.map_location_provided = 1;
+			input->requested_map_location =
+				page_to_pfn(*state_page);
+		}
+
+		status = hv_do_hypercall(HVCALL_MAP_VP_STATE_PAGE, input,
+					 output);
 
 		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
 			if (hv_result_success(status))
@@ -565,8 +572,39 @@ int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
 	return ret;
 }
 
-int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
-				union hv_input_vtl input_vtl)
+static bool mshv_use_overlay_gpfn(void)
+{
+	return hv_l1vh_partition() &&
+	       mshv_root.vmm_caps.vmm_can_provide_overlay_gpfn;
+}
+
+int hv_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+			 union hv_input_vtl input_vtl,
+			 struct page **state_page)
+{
+	int ret = 0;
+	struct page *allocated_page = NULL;
+
+	if (mshv_use_overlay_gpfn()) {
+		allocated_page = alloc_page(GFP_KERNEL);
+		if (!allocated_page)
+			return -ENOMEM;
+		*state_page = allocated_page;
+	} else {
+		*state_page = NULL;
+	}
+
+	ret = hv_call_map_vp_state_page(partition_id, vp_index, type, input_vtl,
+					state_page);
+
+	if (ret && allocated_page)
+		__free_page(allocated_page);
+
+	return ret;
+}
+
+static int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+				       union hv_input_vtl input_vtl)
 {
 	unsigned long flags;
 	u64 status;
@@ -590,6 +628,17 @@ int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
 	return hv_result_to_errno(status);
 }
 
+int hv_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
+			   struct page *state_page, union hv_input_vtl input_vtl)
+{
+	int ret = hv_call_unmap_vp_state_page(partition_id, vp_index, type, input_vtl);
+
+	if (mshv_use_overlay_gpfn() && state_page)
+		__free_page(state_page);
+
+	return ret;
+}
+
 int hv_call_get_partition_property_ex(u64 partition_id, u64 property_code,
 				      u64 arg, void *property_value,
 				      size_t property_value_sz)
diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c
index f7738cefbdf3..52f69eace9b9 100644
--- a/drivers/hv/mshv_root_main.c
+++ b/drivers/hv/mshv_root_main.c
@@ -890,7 +890,7 @@ mshv_partition_ioctl_create_vp(struct mshv_partition *partition,
 {
 	struct mshv_create_vp args;
 	struct mshv_vp *vp;
-	struct page *intercept_message_page, *register_page, *ghcb_page;
+	struct page *intercept_msg_page, *register_page, *ghcb_page;
 	void *stats_pages[2];
 	long ret;
 
@@ -908,28 +908,25 @@ mshv_partition_ioctl_create_vp(struct mshv_partition *partition,
 	if (ret)
 		return ret;
 
-	ret = hv_call_map_vp_state_page(partition->pt_id, args.vp_index,
-					HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
-					input_vtl_zero,
-					&intercept_message_page);
+	ret = hv_map_vp_state_page(partition->pt_id, args.vp_index,
+				   HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
+				   input_vtl_zero, &intercept_msg_page);
 	if (ret)
 		goto destroy_vp;
 
 	if (!mshv_partition_encrypted(partition)) {
-		ret = hv_call_map_vp_state_page(partition->pt_id, args.vp_index,
-						HV_VP_STATE_PAGE_REGISTERS,
-						input_vtl_zero,
-						&register_page);
+		ret = hv_map_vp_state_page(partition->pt_id, args.vp_index,
+					   HV_VP_STATE_PAGE_REGISTERS,
+					   input_vtl_zero, &register_page);
 		if (ret)
 			goto unmap_intercept_message_page;
 	}
 
 	if (mshv_partition_encrypted(partition) &&
 	    is_ghcb_mapping_available()) {
-		ret = hv_call_map_vp_state_page(partition->pt_id, args.vp_index,
-						HV_VP_STATE_PAGE_GHCB,
-						input_vtl_normal,
-						&ghcb_page);
+		ret = hv_map_vp_state_page(partition->pt_id, args.vp_index,
+					   HV_VP_STATE_PAGE_GHCB,
+					   input_vtl_normal, &ghcb_page);
 		if (ret)
 			goto unmap_register_page;
 	}
@@ -960,7 +957,7 @@ mshv_partition_ioctl_create_vp(struct mshv_partition *partition,
 	atomic64_set(&vp->run.vp_signaled_count, 0);
 
 	vp->vp_index = args.vp_index;
-	vp->vp_intercept_msg_page = page_to_virt(intercept_message_page);
+	vp->vp_intercept_msg_page = page_to_virt(intercept_msg_page);
 	if (!mshv_partition_encrypted(partition))
 		vp->vp_register_page = page_to_virt(register_page);
 
@@ -993,21 +990,19 @@ mshv_partition_ioctl_create_vp(struct mshv_partition *partition,
 	if (hv_scheduler_type == HV_SCHEDULER_TYPE_ROOT)
 		mshv_vp_stats_unmap(partition->pt_id, args.vp_index);
 unmap_ghcb_page:
-	if (mshv_partition_encrypted(partition) && is_ghcb_mapping_available()) {
-		hv_call_unmap_vp_state_page(partition->pt_id, args.vp_index,
-					    HV_VP_STATE_PAGE_GHCB,
-					    input_vtl_normal);
-	}
+	if (mshv_partition_encrypted(partition) && is_ghcb_mapping_available())
+		hv_unmap_vp_state_page(partition->pt_id, args.vp_index,
+				       HV_VP_STATE_PAGE_GHCB, ghcb_page,
+				       input_vtl_normal);
 unmap_register_page:
-	if (!mshv_partition_encrypted(partition)) {
-		hv_call_unmap_vp_state_page(partition->pt_id, args.vp_index,
-					    HV_VP_STATE_PAGE_REGISTERS,
-					    input_vtl_zero);
-	}
+	if (!mshv_partition_encrypted(partition))
+		hv_unmap_vp_state_page(partition->pt_id, args.vp_index,
+				       HV_VP_STATE_PAGE_REGISTERS,
+				       register_page, input_vtl_zero);
 unmap_intercept_message_page:
-	hv_call_unmap_vp_state_page(partition->pt_id, args.vp_index,
-				    HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
-				    input_vtl_zero);
+	hv_unmap_vp_state_page(partition->pt_id, args.vp_index,
+			       HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
+			       intercept_msg_page, input_vtl_zero);
 destroy_vp:
 	hv_call_delete_vp(partition->pt_id, args.vp_index);
 	return ret;
@@ -1748,24 +1743,27 @@ static void destroy_partition(struct mshv_partition *partition)
 				mshv_vp_stats_unmap(partition->pt_id, vp->vp_index);
 
 			if (vp->vp_register_page) {
-				(void)hv_call_unmap_vp_state_page(partition->pt_id,
-								  vp->vp_index,
-								  HV_VP_STATE_PAGE_REGISTERS,
-								  input_vtl_zero);
+				(void)hv_unmap_vp_state_page(partition->pt_id,
+							     vp->vp_index,
+							     HV_VP_STATE_PAGE_REGISTERS,
+							     virt_to_page(vp->vp_register_page),
+							     input_vtl_zero);
 				vp->vp_register_page = NULL;
 			}
 
-			(void)hv_call_unmap_vp_state_page(partition->pt_id,
-							  vp->vp_index,
-							  HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
-							  input_vtl_zero);
+			(void)hv_unmap_vp_state_page(partition->pt_id,
+						     vp->vp_index,
+						     HV_VP_STATE_PAGE_INTERCEPT_MESSAGE,
+						     virt_to_page(vp->vp_intercept_msg_page),
+						     input_vtl_zero);
 			vp->vp_intercept_msg_page = NULL;
 
 			if (vp->vp_ghcb_page) {
-				(void)hv_call_unmap_vp_state_page(partition->pt_id,
-								  vp->vp_index,
-								  HV_VP_STATE_PAGE_GHCB,
-								  input_vtl_normal);
+				(void)hv_unmap_vp_state_page(partition->pt_id,
+							     vp->vp_index,
+							     HV_VP_STATE_PAGE_GHCB,
+							     virt_to_page(vp->vp_ghcb_page),
+							     input_vtl_normal);
 				vp->vp_ghcb_page = NULL;
 			}
 
-- 
2.34.1


  parent reply	other threads:[~2025-09-16 23:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-16 23:44 [PATCH v3 0/5] mshv: Fixes for stats and vp state page mappings Nuno Das Neves
2025-09-16 23:44 ` [PATCH v3 1/5] mshv: Only map vp->vp_stats_pages if on root scheduler Nuno Das Neves
2025-09-18 18:38   ` Stanislav Kinsburskii
2025-09-16 23:44 ` [PATCH v3 2/5] mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX hypercall Nuno Das Neves
2025-09-18 18:43   ` Stanislav Kinsburskii
2025-09-19 22:30     ` Nuno Das Neves
2025-09-16 23:44 ` [PATCH v3 3/5] mshv: Get the vmm capabilities offered by the hypervisor Nuno Das Neves
2025-09-18 18:50   ` Stanislav Kinsburskii
2025-09-19 22:37     ` Nuno Das Neves
2025-09-16 23:44 ` Nuno Das Neves [this message]
2025-09-18 18:58   ` [PATCH v3 4/5] mshv: Allocate vp state page for HVCALL_MAP_VP_STATE_PAGE on L1VH Stanislav Kinsburskii
2025-09-23  8:13   ` Anirudh Rayabharam
2025-09-16 23:44 ` [PATCH v3 5/5] mshv: Introduce new hypercall to map stats page for L1VH partitions Nuno Das Neves
2025-09-18 19:53   ` Stanislav Kinsburskii
2025-09-19 22:44     ` Nuno Das Neves

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