6.1-stable review patch. If anyone has any objections, please let me know.
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From: Long Li longli@microsoft.com
[ Upstream commit 09eea7ad0b8e973dcf5ed49902838e5d68177f8e ]
There are use cases that interrupt and monitor pages are mapped to user-mode through UIO, so they need to be system page aligned. Some Hyper-V allocation APIs introduced earlier broke those requirements.
Fix this by using page allocation functions directly for interrupt and monitor pages.
Cc: stable@vger.kernel.org Fixes: ca48739e59df ("Drivers: hv: vmbus: Move Hyper-V page allocator to arch neutral code") Signed-off-by: Long Li longli@microsoft.com Reviewed-by: Michael Kelley mhklinux@outlook.com Link: https://lore.kernel.org/r/1746492997-4599-2-git-send-email-longli@linuxonhyp... Signed-off-by: Wei Liu wei.liu@kernel.org Message-ID: 1746492997-4599-2-git-send-email-longli@linuxonhyperv.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hv/connection.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 744d2809acc3f..7bb94e0dd0f66 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -205,11 +205,20 @@ int vmbus_connect(void) INIT_LIST_HEAD(&vmbus_connection.chn_list); mutex_init(&vmbus_connection.channel_mutex);
+ /* + * The following Hyper-V interrupt and monitor pages can be used by + * UIO for mapping to user-space, so they should always be allocated on + * system page boundaries. The system page size must be >= the Hyper-V + * page size. + */ + BUILD_BUG_ON(PAGE_SIZE < HV_HYP_PAGE_SIZE); + /* * Setup the vmbus event connection for channel interrupt * abstraction stuff */ - vmbus_connection.int_page = hv_alloc_hyperv_zeroed_page(); + vmbus_connection.int_page = + (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); if (vmbus_connection.int_page == NULL) { ret = -ENOMEM; goto cleanup; @@ -224,8 +233,8 @@ int vmbus_connect(void) * Setup the monitor notification facility. The 1st page for * parent->child and the 2nd page for child->parent */ - vmbus_connection.monitor_pages[0] = hv_alloc_hyperv_page(); - vmbus_connection.monitor_pages[1] = hv_alloc_hyperv_page(); + vmbus_connection.monitor_pages[0] = (void *)__get_free_page(GFP_KERNEL); + vmbus_connection.monitor_pages[1] = (void *)__get_free_page(GFP_KERNEL); if ((vmbus_connection.monitor_pages[0] == NULL) || (vmbus_connection.monitor_pages[1] == NULL)) { ret = -ENOMEM; @@ -341,21 +350,23 @@ void vmbus_disconnect(void) destroy_workqueue(vmbus_connection.work_queue);
if (vmbus_connection.int_page) { - hv_free_hyperv_page(vmbus_connection.int_page); + free_page((unsigned long)vmbus_connection.int_page); vmbus_connection.int_page = NULL; }
if (vmbus_connection.monitor_pages[0]) { if (!set_memory_encrypted( (unsigned long)vmbus_connection.monitor_pages[0], 1)) - hv_free_hyperv_page(vmbus_connection.monitor_pages[0]); + free_page((unsigned long) + vmbus_connection.monitor_pages[0]); vmbus_connection.monitor_pages[0] = NULL; }
if (vmbus_connection.monitor_pages[1]) { if (!set_memory_encrypted( (unsigned long)vmbus_connection.monitor_pages[1], 1)) - hv_free_hyperv_page(vmbus_connection.monitor_pages[1]); + free_page((unsigned long) + vmbus_connection.monitor_pages[1]); vmbus_connection.monitor_pages[1] = NULL; } }