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Message-ID: <dde3cb9dc2fb26db9d5508c11c6d9dee1505b0df.camel@infradead.org>
Subject: Re: [PATCH v3 09/13] KVM: xen: automatically use the vcpu_info
 embedded in shared_info
From:   David Woodhouse <dwmw2@infradead.org>
To:     Paul Durrant <paul@xen.org>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Paul Durrant <pdurrant@amazon.com>,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org
Date:   Mon, 18 Sep 2023 17:07:26 +0100
In-Reply-To: <20230918144111.641369-10-paul@xen.org>
References: <20230918144111.641369-1-paul@xen.org>
         <20230918144111.641369-10-paul@xen.org>
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On Mon, 2023-09-18 at 14:41 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@amazon.com>
>=20
> The VMM should only need to set the KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO
> attribute in response to a VCPUOP_register_vcpu_info hypercall. We can
> handle the default case internally since we already know where the
> shared_info page is. Modify get_vcpu_info_cache() to pass back a pointer
> to the shared info pfn cache (and appropriate offset) for any of the
> first 32 vCPUs if the attribute has not been set.
>=20
> A VMM will be able to determine whether it needs to set up default
> vcpu_info using the previously defined KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA
> Xen capability flag, which will be advertized in a subsequent patch.
>=20
> Also update the KVM API documentation to describe the new behaviour.
>=20
> Signed-off-by: Paul Durrant <pdurrant@amazon.com>
> ---
> Cc: Sean Christopherson <seanjc@google.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: x86@kernel.org
>=20
> v3:
> =C2=A0- Add a note to the API documentation discussing vcpu_info copying.
>=20
> v2:
> =C2=A0- Dispense with the KVM_XEN_HVM_CONFIG_DEFAULT_VCPU_INFO capability=
.
> =C2=A0- Add API documentation.
> ---
> =C2=A0Documentation/virt/kvm/api.rst | 22 +++++++++++++++-------
> =C2=A0arch/x86/kvm/xen.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 | 15 +++++++++++++++
> =C2=A02 files changed, 30 insertions(+), 7 deletions(-)
>=20
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.=
rst
> index e9df4df6fe48..47bf3db74674 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -5442,13 +5442,7 @@ KVM_XEN_ATTR_TYPE_LONG_MODE
> =C2=A0
> =C2=A0KVM_XEN_ATTR_TYPE_SHARED_INFO
> =C2=A0=C2=A0 Sets the guest physical frame number at which the Xen shared=
_info
> -=C2=A0 page resides. Note that although Xen places vcpu_info for the fir=
st
> -=C2=A0 32 vCPUs in the shared_info page, KVM does not automatically do s=
o
> -=C2=A0 and instead requires that KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO be use=
d
> -=C2=A0 explicitly even when the vcpu_info for a given vCPU resides at th=
e
> -=C2=A0 "default" location in the shared_info page. This is because KVM m=
ay
> -=C2=A0 not be aware of the Xen CPU id which is used as the index into th=
e
> -=C2=A0 vcpu_info[] array, so may know the correct default location.
> +=C2=A0 page resides.
> =C2=A0
> =C2=A0=C2=A0 Note that the shared_info page may be constantly written to =
by KVM;
> =C2=A0=C2=A0 it contains the event channel bitmap used to deliver interru=
pts to
> @@ -5564,12 +5558,26 @@ type values:
> =C2=A0
> =C2=A0KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO
> =C2=A0=C2=A0 Sets the guest physical address of the vcpu_info for a given=
 vCPU.
> +=C2=A0 The vcpu_info for the first 32 vCPUs defaults to the structures
> +=C2=A0 embedded in the shared_info page.

The above is true only if KVM has KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA.
You kind of touch on that next, but perhaps the 'if the KVM_...'
condition should be moved up?

> +=C2=A0 If the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA flag is also set in the
> +=C2=A0 Xen capabilities then the VMM is not required to set this default
> +=C2=A0 location; KVM will handle that internally. Otherwise this attribu=
te
> +=C2=A0 must be set for all vCPUs.
> +
> =C2=A0=C2=A0 As with the shared_info page for the VM, the corresponding p=
age may be
> =C2=A0=C2=A0 dirtied at any time if event channel interrupt delivery is e=
nabled, so
> =C2=A0=C2=A0 userspace should always assume that the page is dirty withou=
t relying
> =C2=A0=C2=A0 on dirty logging. Setting the gpa to KVM_XEN_INVALID_GPA wil=
l disable
> =C2=A0=C2=A0 the vcpu_info.
> =C2=A0
> +=C2=A0 Note that, if the guest sets an explicit vcpu_info location in gu=
est
> +=C2=A0 memory then the VMM is expected to copy the content of the struct=
ure
> +=C2=A0 embedded in the shared_info page to the new location. It is there=
fore
> +=C2=A0 important that no event delivery is in progress at this time, oth=
erwise
> +=C2=A0 events may be missed.
>=20

That's difficult. It means tearing down all interrupts from passthrough
devices which are mapped via PIRQs, and also all IPIs.=20

The IPI code *should* be able to fall back to just letting the VMM
handle the hypercall in userspace. But PIRQs are harder. I'd be happier
if our plan =E2=80=94 handwavy though it may be =E2=80=94 led to being able=
 to use the
existing slow path for delivering interrupts by just *invalidating* the
cache. Maybe we *should* move the memcpy into the kernel, and let it
lock *both* the shinfo and new vcpu_info caches while it's doing the
copy? Given that that's the only valid transition, that shouldn't be so
hard, should it?

> =C2=A0KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO
> =C2=A0=C2=A0 Sets the guest physical address of an additional pvclock str=
ucture
> =C2=A0=C2=A0 for a given vCPU. This is typically used for guest vsyscall =
support.
> diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
> index 459f3ca4710e..660a808c0b50 100644
> --- a/arch/x86/kvm/xen.c
> +++ b/arch/x86/kvm/xen.c
> @@ -491,6 +491,21 @@ static void kvm_xen_inject_vcpu_vector(struct kvm_vc=
pu *v)
> =C2=A0
> =C2=A0static struct gfn_to_pfn_cache *get_vcpu_info_cache(struct kvm_vcpu=
 *v, unsigned long *offset)
> =C2=A0{
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (!v->arch.xen.vcpu_info_cac=
he.active && v->arch.xen.vcpu_id < MAX_VIRT_CPUS) {
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0struct kvm *kvm =3D v->kvm;
> +
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0if (offset) {
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (IS_EN=
ABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode)
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*offset =3D offsetof(struct shared_i=
nfo,
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 vc=
pu_info[v->arch.xen.vcpu_id]);
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0else
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*offset =3D offsetof(struct compat_s=
hared_info,
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 vc=
pu_info[v->arch.xen.vcpu_id]);
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0}
> +
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0return &kvm->arch.xen.shinfo_cache;
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}
> +
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (offset)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0*offset =3D 0;
> =C2=A0


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