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Wed, 20 Nov 2024 03:35:59 -0800 (PST) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper Subject: [PATCH 1/2] x86/irq: fix calculation of max PV dom0 pIRQs Date: Wed, 20 Nov 2024 12:35:54 +0100 Message-ID: <20241120113555.38146-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241120113555.38146-1-roger.pau@citrix.com> References: <20241120113555.38146-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1732102588045116600 The current calculation of PV dom0 pIRQs uses: n =3D min(fls(num_present_cpus()), dom0_max_vcpus()); The usage of fls() is wrong, as num_present_cpus() already returns the numb= er of present CPUs, not the bitmap mask of CPUs. Fix by removing the usage of fls(). Fixes: 7e73a6e7f12a ('have architectures specify the number of PIRQs a hard= ware domain gets') Signed-off-by: Roger Pau Monn=C3=A9 Acked-by: Andrew Cooper --- xen/arch/x86/io_apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c index d44d2c9a4173..bd5ad61c85e4 100644 --- a/xen/arch/x86/io_apic.c +++ b/xen/arch/x86/io_apic.c @@ -2744,7 +2744,7 @@ void __init ioapic_init(void) =20 unsigned int __hwdom_init arch_hwdom_irqs(const struct domain *d) { - unsigned int n =3D fls(num_present_cpus()); + unsigned int n =3D num_present_cpus(); /* Bounding by the domain pirq EOI bitmap capacity. */ const unsigned int max_irqs =3D min_t(unsigned int, nr_irqs, PAGE_SIZE * BITS_PER_BYTE); --=20 2.46.0