linux-kernel - Re: [PATCH 1/1] tools headers UAPI: Sync linux/kvm.h with the kernel sources

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Message-ID: <aQjUqXb-iIVIg7Fc@x1>
Date: Mon, 3 Nov 2025 13:13:29 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Fuad Tabba <tabba@...gle.com>
Cc: linux-kernel@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 1/1] tools headers UAPI: Sync linux/kvm.h with the kernel
 sources

On Mon, Nov 03, 2025 at 03:57:55PM +0000, Fuad Tabba wrote:
> On Mon, 3 Nov 2025 at 14:40, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> >
> > tldr; Just FYI, I'm carrying this on the perf tools tree.
> >
> > Full explanation:
> >
> > There used to be no copies, with tools/ code using kernel headers
> > directly. From time to time tools/perf/ broke due to legitimate kernel
> > hacking. At some point Linus complained about such direct usage. Then we
> > adopted the current model.
> >
> > See further details at:
> >
> >  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/include/uapi/README
> >
> > To pick the changes in:
> >
> >   fe2bf6234e947bf5 ("KVM: guest_memfd: Add INIT_SHARED flag, reject user page faults if not set")
> >   d2042d8f96ddefde ("KVM: Rework KVM_CAP_GUEST_MEMFD_MMAP into KVM_CAP_GUEST_MEMFD_FLAGS")
> >   3d3a04fad25a6621 ("KVM: Allow and advertise support for host mmap() on guest_memfd files")
> >
> > That just rebuilds perf, as these patches don't add any new KVM ioctl to
> > be harvested for the the 'perf trace' ioctl syscall argument
> > beautifiers.
> 
> nit: "the" is repeated. I've noticed this in earlier commits of yours
> to this file as well :)

eagle eagle eyes! Fixed.

Thanks,

- Arnaldo
 
> > This addresses this perf build warning:
> >
> >   Warning: Kernel ABI header differences:
> >     diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
> >
> >   Please see tools/include/uapi/README for further details.
> >
> > Cc: Sean Christopherson <seanjc@...gle.com>
> > Cc: Fuad Tabba <tabba@...gle.com>
> > Cc: Paolo Bonzini <pbonzini@...hat.com>
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > ---
> 
> Reviewed-by: Fuad Tabba <tabba@...gle.com>
> 
> Cheers,
> /fuad
> 
> >  tools/include/uapi/linux/kvm.h | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
> > index f0f0d49d25443552..52f6000ab020840e 100644
> > --- a/tools/include/uapi/linux/kvm.h
> > +++ b/tools/include/uapi/linux/kvm.h
> > @@ -962,6 +962,7 @@ struct kvm_enable_cap {
> >  #define KVM_CAP_ARM_EL2_E2H0 241
> >  #define KVM_CAP_RISCV_MP_STATE_RESET 242
> >  #define KVM_CAP_ARM_CACHEABLE_PFNMAP_SUPPORTED 243
> > +#define KVM_CAP_GUEST_MEMFD_FLAGS 244
> >
> >  struct kvm_irq_routing_irqchip {
> >         __u32 irqchip;
> > @@ -1598,6 +1599,8 @@ struct kvm_memory_attributes {
> >  #define KVM_MEMORY_ATTRIBUTE_PRIVATE           (1ULL << 3)
> >
> >  #define KVM_CREATE_GUEST_MEMFD _IOWR(KVMIO,  0xd4, struct kvm_create_guest_memfd)
> > +#define GUEST_MEMFD_FLAG_MMAP          (1ULL << 0)
> > +#define GUEST_MEMFD_FLAG_INIT_SHARED   (1ULL << 1)
> >
> >  struct kvm_create_guest_memfd {
> >         __u64 size;
> > --
> > 2.51.1
> >