[RFC PATCH v1 17/57] kvm: Remove PAGE_SIZE compile-time constant assumption

Ryan Roberts
2024-10-14T11:47:48Z

To prepare for supporting boot-time page size selection, refactor code
to remove assumptions about PAGE_SIZE being compile-time constant. Code
intended to be equivalent when compile-time page size is active.

Modify BUILD_BUG_ON() to compare with page size limit.

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---

***NOTE***
Any confused maintainers may want to read the cover note here for context:
https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/

virt/kvm/kvm_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cb2b78e92910f..6c862bc41a672 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4244,7 +4244,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, unsigned long id)
goto vcpu_decrement;
}

- BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE);
+ BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE_MIN);
page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!page) {
r = -ENOMEM;
--
2.43.0