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Wed, 26 Jun 2024 09:28:41 -0700 (PDT) From: Alejandro Vallejo To: Xen-devel Cc: Alejandro Vallejo , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Oleksii Kurochko Subject: [PATCH for 4.19 v4 02/10] x86/vlapic: Move lapic migration checks to the check hooks Date: Wed, 26 Jun 2024 17:28:29 +0100 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1719419352716100004 While doing this, factor out checks common to architectural and hidden stat= e. Signed-off-by: Alejandro Vallejo Reviewed-by: Roger Pau Monn=C3=A9 --- This puts essential LAPIC information in the stream. It's technically a fea= ture but it makes 4.19 guests a lot more future-proof. I think this should go on= 4.19 v4: * Replaced BUG() with ASSERT_UNREACHABLE(), and allow ret -EINVAL on rele= ase. * Adjust printk() to be clearer * Assign lapic_check_common() outside the "if" condition. --- xen/arch/x86/hvm/vlapic.c | 85 ++++++++++++++++++++++++++------------- 1 file changed, 58 insertions(+), 27 deletions(-) diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c index 9cfc82666ae5..1a7bca5afd2f 100644 --- a/xen/arch/x86/hvm/vlapic.c +++ b/xen/arch/x86/hvm/vlapic.c @@ -1553,60 +1553,91 @@ static void lapic_load_fixup(struct vlapic *vlapic) v, vlapic->loaded.id, vlapic->loaded.ldr, good_ldr); } =20 -static int cf_check lapic_load_hidden(struct domain *d, hvm_domain_context= _t *h) -{ - unsigned int vcpuid =3D hvm_load_instance(h); - struct vcpu *v; - struct vlapic *s; =20 +static int lapic_check_common(const struct domain *d, unsigned int vcpuid) +{ if ( !has_vlapic(d) ) return -ENODEV; =20 /* Which vlapic to load? */ - if ( vcpuid >=3D d->max_vcpus || (v =3D d->vcpu[vcpuid]) =3D=3D NULL ) + if ( !domain_vcpu(d, vcpuid) ) { - dprintk(XENLOG_G_ERR, "HVM restore: dom%d has no apic%u\n", + dprintk(XENLOG_G_ERR, "HVM restore: dom%d has no vCPU %u\n", d->domain_id, vcpuid); return -EINVAL; } - s =3D vcpu_vlapic(v); + + return 0; +} + +static int cf_check lapic_check_hidden(const struct domain *d, + hvm_domain_context_t *h) +{ + unsigned int vcpuid =3D hvm_load_instance(h); + struct hvm_hw_lapic s; + int rc =3D lapic_check_common(d, vcpuid); + + if ( rc ) + return rc; + + if ( hvm_load_entry_zeroextend(LAPIC, h, &s) !=3D 0 ) + return -ENODATA; + + /* EN=3D0 with EXTD=3D1 is illegal */ + if ( (s.apic_base_msr & (APIC_BASE_ENABLE | APIC_BASE_EXTD)) =3D=3D + APIC_BASE_EXTD ) + return -EINVAL; + + return 0; +} + +static int cf_check lapic_load_hidden(struct domain *d, hvm_domain_context= _t *h) +{ + unsigned int vcpuid =3D hvm_load_instance(h); + struct vcpu *v =3D d->vcpu[vcpuid]; + struct vlapic *s =3D vcpu_vlapic(v); =20 if ( hvm_load_entry_zeroextend(LAPIC, h, &s->hw) !=3D 0 ) + { + ASSERT_UNREACHABLE(); return -EINVAL; + } =20 s->loaded.hw =3D 1; if ( s->loaded.regs ) lapic_load_fixup(s); =20 - if ( !(s->hw.apic_base_msr & APIC_BASE_ENABLE) && - unlikely(vlapic_x2apic_mode(s)) ) - return -EINVAL; - hvm_update_vlapic_mode(v); =20 return 0; } =20 -static int cf_check lapic_load_regs(struct domain *d, hvm_domain_context_t= *h) +static int cf_check lapic_check_regs(const struct domain *d, + hvm_domain_context_t *h) { unsigned int vcpuid =3D hvm_load_instance(h); - struct vcpu *v; - struct vlapic *s; + int rc; =20 - if ( !has_vlapic(d) ) - return -ENODEV; + if ( (rc =3D lapic_check_common(d, vcpuid)) ) + return rc; =20 - /* Which vlapic to load? */ - if ( vcpuid >=3D d->max_vcpus || (v =3D d->vcpu[vcpuid]) =3D=3D NULL ) - { - dprintk(XENLOG_G_ERR, "HVM restore: dom%d has no apic%u\n", - d->domain_id, vcpuid); - return -EINVAL; - } - s =3D vcpu_vlapic(v); + if ( !hvm_get_entry(LAPIC_REGS, h) ) + return -ENODATA; + + return 0; +} + +static int cf_check lapic_load_regs(struct domain *d, hvm_domain_context_t= *h) +{ + unsigned int vcpuid =3D hvm_load_instance(h); + struct vcpu *v =3D d->vcpu[vcpuid]; + struct vlapic *s =3D vcpu_vlapic(v); =20 if ( hvm_load_entry(LAPIC_REGS, h, s->regs) !=3D 0 ) + { + ASSERT_UNREACHABLE(); return -EINVAL; + } =20 s->loaded.id =3D vlapic_get_reg(s, APIC_ID); s->loaded.ldr =3D vlapic_get_reg(s, APIC_LDR); @@ -1623,9 +1654,9 @@ static int cf_check lapic_load_regs(struct domain *d,= hvm_domain_context_t *h) return 0; } =20 -HVM_REGISTER_SAVE_RESTORE(LAPIC, lapic_save_hidden, NULL, +HVM_REGISTER_SAVE_RESTORE(LAPIC, lapic_save_hidden, lapic_check_hidden, lapic_load_hidden, 1, HVMSR_PER_VCPU); -HVM_REGISTER_SAVE_RESTORE(LAPIC_REGS, lapic_save_regs, NULL, +HVM_REGISTER_SAVE_RESTORE(LAPIC_REGS, lapic_save_regs, lapic_check_regs, lapic_load_regs, 1, HVMSR_PER_VCPU); =20 int vlapic_init(struct vcpu *v) --=20 2.34.1