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Re: [PATCH 2/2] domain: expose newly introduced hypercalls as XENFEAT
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 6 Oct 2023 11:47:48 +0100
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- Cc: Henry Wang <Henry.Wang@xxxxxxx>, Community Manager <community.manager@xxxxxxxxxxxxxx>, 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 10:47:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06/10/2023 10:13 am, Roger Pau Monne wrote:
> 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>
Thanks for doing this.
> ---
> 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.
I'd suggest linear/virtual here. Linear is the correct term in x86, but
virtual is the correct term in pretty much every other architecture.
> 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:
This is not what the hypervisor implements. It's what the domain is
permitted to use.
There also needs to be a matching patch to public/vcpu.h to require
implementations to check for these feature bits before using the new
hypercalls.
Also,
diff --git a/xen/common/domain.c b/xen/common/domain.c
index b8281d7cff9d..df994bd30fd2 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1998,6 +1998,10 @@ long common_vcpu_op(int cmd, struct vcpu *v
{
struct vcpu_register_runstate_memory_area area;
+ rc = -ENOSYS;
+ if ( 0 /* TODO: Dom's XENFEAT_runstate_phys_area setting */ )
+ break;
+
rc = -EFAULT;
if ( copy_from_guest(&area.addr.p, arg, 1) )
break;
and a matching one for XENFEAT_vcpu_time_phys_area because I'm even more
serious about this becoming a domain controllable setting following what
OSSTest had to say overnight.
~Andrew
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