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Re: [PATCH 13/22] x86: FRED enumerations
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- Date: Thu, 14 Aug 2025 21:37:07 +0200
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 14 Aug 2025 19:37:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-08-14 13:47, Andrew Cooper wrote:
On 14/08/2025 12:44 pm, Jan Beulich wrote:
On 14.08.2025 13:42, Andrew Cooper wrote:
On 14/08/2025 12:20 pm, Jan Beulich wrote:
On 08.08.2025 22:23, Andrew Cooper wrote:
--- a/xen/arch/x86/include/asm/x86-defns.h
+++ b/xen/arch/x86/include/asm/x86-defns.h
@@ -75,6 +75,7 @@
#define X86_CR4_PKE 0x00400000 /* enable PKE */
#define X86_CR4_CET 0x00800000 /* Control-flow Enforcement
Technology */
#define X86_CR4_PKS 0x01000000 /* Protection Key Supervisor
*/
+#define X86_CR4_FRED 0x100000000 /* Fast Return and Event
Delivery */
... a UL suffix added here for Misra.
I was surprised, but Eclair is entirely fine with this.
And there is a use of the identifier in a monitored C file?
Yes. traps-setup.c which definitely has not been added to an exclusion
list.
Might look into it before the end of the week, if time allows. Is [1]
the right branch to look at?
[1]
https://gitlab.com/xen-project/hardware/xen-staging/-/commits/andrew/fred
~Andrew
--
Nicola Vetrini, B.Sc.
Software Engineer
BUGSENG (https://bugseng.com)
LinkedIn: https://www.linkedin.com/in/nicola-vetrini-a42471253
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