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Wed, 19 Nov 2025 02:51:07 -0800 (PST) Message-ID: <06f2081b-64e0-47f5-b66a-26363979cfdb@suse.com> Date: Wed, 19 Nov 2025 11:51:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 4/4] x86/vPMU: don't statically reserve the interrupt vector From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= References: Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1763549481930153000 Content-Type: text/plain; charset="utf-8" Move the setup to vPMU code, doing the allocation of a vector only when one is actually going to be needed. With that the handler function also doesn't need to be split across two places anymore. Add the freed up vector to the dynamically allocatable range. Signed-off-by: Jan Beulich --- In case down the road we also want to have a build mode with vPMU code excluded, this may also simplify things a little there. --- a/xen/arch/x86/apic.c +++ b/xen/arch/x86/apic.c @@ -1313,16 +1313,6 @@ static void cf_check error_interrupt(voi entries[3], entries[2], entries[1], entries[0]); } =20 -/* - * This interrupt handles performance counters interrupt - */ - -static void cf_check pmu_interrupt(void) -{ - ack_APIC_irq(); - vpmu_do_interrupt(); -} - void __init apic_intr_init(void) { smp_intr_init(); @@ -1333,9 +1323,6 @@ void __init apic_intr_init(void) /* IPI vectors for APIC spurious and error interrupts */ set_direct_apic_vector(SPURIOUS_APIC_VECTOR, spurious_interrupt); set_direct_apic_vector(ERROR_APIC_VECTOR, error_interrupt); - - /* Performance Counters Interrupt */ - set_direct_apic_vector(PMU_APIC_VECTOR, pmu_interrupt); } =20 /* --- a/xen/arch/x86/cpu/vpmu.c +++ b/xen/arch/x86/cpu/vpmu.c @@ -40,6 +40,8 @@ static struct arch_vpmu_ops __initdata v static DEFINE_SPINLOCK(vpmu_lock); static unsigned vpmu_count; =20 +static uint8_t __ro_after_init pmu_apic_vector; + static DEFINE_PER_CPU(struct vcpu *, last_vcpu); =20 static int __init cf_check parse_vpmu_params(const char *s) @@ -94,7 +96,7 @@ void vpmu_lvtpc_update(uint32_t val) =20 vpmu =3D vcpu_vpmu(curr); =20 - vpmu->hw_lapic_lvtpc =3D PMU_APIC_VECTOR | (val & APIC_LVT_MASKED); + vpmu->hw_lapic_lvtpc =3D pmu_apic_vector | (val & APIC_LVT_MASKED); =20 /* Postpone APIC updates for PV(H) guests if PMU interrupt is pending = */ if ( has_vlapic(curr->domain) || !vpmu->xenpmu_data || @@ -160,7 +162,7 @@ static inline struct vcpu *choose_hwdom_ return hardware_domain->vcpu[idx]; } =20 -void vpmu_do_interrupt(void) +static void cf_check vpmu_interrupt(void) { struct vcpu *sampled =3D current, *sampling; struct vpmu_struct *vpmu; @@ -169,6 +171,8 @@ void vpmu_do_interrupt(void) uint32_t vlapic_lvtpc; #endif =20 + ack_APIC_irq(); + /* * dom0 will handle interrupt for special domains (e.g. idle domain) o= r, * in XENPMU_MODE_ALL, for everyone. @@ -369,7 +373,7 @@ void vpmu_save(struct vcpu *v) =20 vpmu_reset(vpmu, VPMU_CONTEXT_SAVE); =20 - apic_write(APIC_LVTPC, PMU_APIC_VECTOR | APIC_LVT_MASKED); + apic_write(APIC_LVTPC, pmu_apic_vector | APIC_LVT_MASKED); } =20 int vpmu_load(struct vcpu *v, bool from_guest) @@ -432,7 +436,7 @@ static int vpmu_arch_initialise(struct v return ret; } =20 - vpmu->hw_lapic_lvtpc =3D PMU_APIC_VECTOR | APIC_LVT_MASKED; + vpmu->hw_lapic_lvtpc =3D pmu_apic_vector | APIC_LVT_MASKED; vpmu_set(vpmu, VPMU_INITIALIZED); =20 return 0; @@ -860,6 +864,8 @@ static int __init cf_check vpmu_init(voi register_cpu_notifier(&cpu_nfb); printk(XENLOG_INFO "VPMU: version " __stringify(XENPMU_VER_MAJ) "." __stringify(XENPMU_VER_MIN) "\n"); + + alloc_direct_apic_vector(&pmu_apic_vector, vpmu_interrupt); } else { --- a/xen/arch/x86/include/asm/irq-vectors.h +++ b/xen/arch/x86/include/asm/irq-vectors.h @@ -8,13 +8,12 @@ #define EVENT_CHECK_VECTOR 0xfc #define CALL_FUNCTION_VECTOR 0xfb #define LOCAL_TIMER_VECTOR 0xfa -#define PMU_APIC_VECTOR 0xf9 /* * High-priority dynamically-allocated vectors. For interrupts that * must be higher priority than any guest-bound interrupt. */ #define FIRST_HIPRIORITY_VECTOR 0xf1 -#define LAST_HIPRIORITY_VECTOR 0xf8 +#define LAST_HIPRIORITY_VECTOR 0xf9 /* IRQ0 (timer) is statically allocated but must be high priority. */ #define IRQ0_VECTOR 0xf0 =20 --- a/xen/arch/x86/include/asm/vpmu.h +++ b/xen/arch/x86/include/asm/vpmu.h @@ -99,7 +99,6 @@ static inline bool vpmu_are_all_set(cons =20 void vpmu_lvtpc_update(uint32_t val); int vpmu_do_msr(unsigned int msr, uint64_t *msr_content, bool is_write); -void vpmu_do_interrupt(void); void vpmu_initialise(struct vcpu *v); void vpmu_destroy(struct vcpu *v); void vpmu_save(struct vcpu *v);