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[PATCH 2/2] domain: expose newly introduced hypercalls as XENFEAT
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Fri, 6 Oct 2023 11:13:53 +0200
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- Cc: Henry Wang <Henry.Wang@xxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Community Manager <community.manager@xxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 06 Oct 2023 09:16:54 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
XENFEAT_runstate_phys_area is exposed to all architectures, while
XENFEAT_vcpu_time_phys_area is currnelty only implemented for x86, and hence
the feature flag is also only exposed on x86.
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
CHANGELOG.md | 2 ++
xen/common/kernel.c | 6 +++++-
xen/include/public/features.h | 9 +++++++++
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e33cf4e1b113..41da710426f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,8 @@ The format is based on [Keep a
Changelog](https://keepachangelog.com/en/1.0.0/)
- Add Intel Hardware P-States (HWP) cpufreq driver.
- On Arm, experimental support for dynamic addition/removal of Xen device tree
nodes using a device tree overlay binary (.dtbo).
+ - Introduce two new hypercalls to map the vCPU runstate and time areas by
+ physical rather than linear addresses.
### Removed
- On x86, the "pku" command line option has been removed. It has never
diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index 52aa28762782..b6302e44b34e 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -607,7 +607,11 @@ long do_xen_version(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
switch ( fi.submap_idx )
{
case 0:
- fi.submap = (1U << XENFEAT_memory_op_vnode_supported);
+ fi.submap = (1U << XENFEAT_memory_op_vnode_supported) |
+#ifdef CONFIG_X86
+ (1U << XENFEAT_vcpu_time_phys_area) |
+#endif
+ (1U << XENFEAT_runstate_phys_area);
if ( VM_ASSIST(d, pae_extended_cr3) )
fi.submap |= (1U << XENFEAT_pae_pgdir_above_4gb);
if ( paging_mode_translate(d) )
diff --git a/xen/include/public/features.h b/xen/include/public/features.h
index d2a9175aae67..cffb2f14a562 100644
--- a/xen/include/public/features.h
+++ b/xen/include/public/features.h
@@ -111,6 +111,15 @@
#define XENFEAT_not_direct_mapped 16
#define XENFEAT_direct_mapped 17
+/*
+ * Signal whether the hypervisor implements the following hypercalls:
+ *
+ * VCPUOP_register_runstate_phys_area
+ * VCPUOP_register_vcpu_time_phys_area
+ */
+#define XENFEAT_runstate_phys_area 18
+#define XENFEAT_vcpu_time_phys_area 19
+
#define XENFEAT_NR_SUBMAPS 1
#endif /* __XEN_PUBLIC_FEATURES_H__ */
--
2.42.0
|
