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Re: [PATCH v1 1/2] domctl: Handle XEN_DOMCTL_getpageframeinfo3 without the domctl lock
- To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 11 Jun 2026 09:11:15 -0400
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Thu, 11 Jun 2026 13:11:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 6/9/26 11:15 AM, Ross Lagerwall wrote:
It does not have side effects and is protected from concurrent changes
by the P2M read lock therefore skip taking the domctl lock.
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
xen/arch/x86/domctl.c | 4 ++++
xen/common/domctl.c | 1 +
2 files changed, 5 insertions(+)
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 83bf51e498df..0e9a2532887e 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -301,6 +301,10 @@ long arch_do_domctl(
/* Games to allow this code block to handle a compat guest. */
void __user *guest_handle = domctl->u.getpageframeinfo3.array.p;
+ ret = xsm_domctl(XSM_OTHER, d, domctl);
+ if ( ret )
+ break;
+
if ( unlikely(num > 1024) ||
unlikely(num != domctl->u.getpageframeinfo3.num) )
{
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 3efa5b9d55b9..35144d95b808 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -555,6 +555,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
case XEN_DOMCTL_gsi_permission:
case XEN_DOMCTL_bind_pt_irq:
case XEN_DOMCTL_unbind_pt_irq:
+ case XEN_DOMCTL_getpageframeinfo3:
ret = arch_do_domctl(op, d, u_domctl);
goto domctl_out_unlock_domonly;
I would respectfully ask to be mindful when XSM hooks are being
manipulated in a patch that a review from an XSM maintainer should be
sought before committing a patch. In this case case the change itself is
good, though I would have liked the opportunity to comment that the
commit message should have had some explanation on the xsm change.
V/r,
Daniel P. Smith
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