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Date: Thu, 19 Apr 2012 15:02:17 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Lin Ming <mlin@...pku.edu.cn>
Cc: linux-kernel@...r.kernel.org,
Steven Noonan <steven@...inklabs.net>,
Ben Guthro <ben@...hro.net>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Marcus Granado <marcus.granado@...rix.com>,
xen-devel@...ts.xen.org
Subject: Re: [PATCH 1/2] xen: implement apic ipi interface
On Sun, Apr 15, 2012 at 02:09:31PM +0800, Lin Ming wrote:
> From: Ben Guthro <ben@...hro.net>
>
> Map native ipi vector to xen vector.
> Implement apic ipi interface with xen_send_IPI_one.
I keep on getting this (so PV guest without any SMP support,
and with just PV frontend drivers):
echo "CONFIG_PARAVIRT_GUEST=y" > linux.config
echo "CONFIG_XEN=y" >> linux.config
echo "CONFIG_XEN_XENBUS_FRONTEND=m" >> linux.config
cat xen.config | grep FRONTEND >> linux.config
echo "# CONFIG_XEN_PRIVILEGED_GUEST is not set" >> linux.config
echo "# CONFIG_XEN_DOM0 is not set" >> linux.config
echo "# CONFIG_ACPI is not set" >> linux.config
echo "# CONFIG_PCI is not set" >> linux.config
echo "# CONFIG_XENFS is not set" >> linux.config
echo "# CONFIG_SMP is not set" >> linux.config
make -j$((4 * 2)) -C /home/konrad/ssd/konrad/xtt-compile/linux O=/home/konrad/ssd/konrad/xtt-compile/linux-build- defconfig
make[2]: Entering directory `/home/konrad/ssd/konrad/linux'
GEN /home/konrad/ssd/konrad/xtt-compile/linux-build-/Makefile
*** Default configuration is based on 'x86_64_defconfig'
#
# configuration written to .config
cat linux.config >> linux-build-/.config
make -j4 ..
LD init/built-in.o
LD .tmp_vmlinux1
arch/x86/built-in.o: In function `xen_start_kernel':
(.init.text+0x5a8): undefined reference to `xen_send_IPI_allbutself'
arch/x86/built-in.o: In function `xen_start_kernel':
(.init.text+0x5b3): undefined reference to `xen_send_IPI_mask_allbutself'
arch/x86/built-in.o: In function `xen_start_kernel':
(.init.text+0x5be): undefined reference to `xen_send_IPI_mask'
arch/x86/built-in.o: In function `xen_start_kernel':
(.init.text+0x5c9): undefined reference to `xen_send_IPI_all'
arch/x86/built-in.o: In function `xen_start_kernel':
(.init.text+0x5d4): undefined reference to `xen_send_IPI_self'
make[2]: *** [.tmp_vmlinux1] Error 1
>
> Signed-off-by: Ben Guthro <ben@...hro.net>
> Signed-off-by: Lin Ming <mlin@...pku.edu.cn>
> ---
>
> Ben,
>
> This patch was taken from part of your patch at:
> https://lkml.org/lkml/2012/2/10/681
>
> Is it OK that I added your SOB?
>
> I did some change to map native ipi vector to xen vector.
> Could you please review?
>
> Thanks.
>
> arch/x86/xen/enlighten.c | 7 ++++
> arch/x86/xen/smp.c | 81 +++++++++++++++++++++++++++++++++++++++++++--
> arch/x86/xen/smp.h | 12 +++++++
> 3 files changed, 96 insertions(+), 4 deletions(-)
> create mode 100644 arch/x86/xen/smp.h
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 4f51beb..be7dbc8 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -74,6 +74,7 @@
>
> #include "xen-ops.h"
> #include "mmu.h"
> +#include "smp.h"
> #include "multicalls.h"
>
> EXPORT_SYMBOL_GPL(hypercall_page);
> @@ -849,6 +850,12 @@ static void set_xen_basic_apic_ops(void)
> apic->icr_write = xen_apic_icr_write;
> apic->wait_icr_idle = xen_apic_wait_icr_idle;
> apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle;
> +
> + apic->send_IPI_allbutself = xen_send_IPI_allbutself;
> + apic->send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself;
> + apic->send_IPI_mask = xen_send_IPI_mask;
> + apic->send_IPI_all = xen_send_IPI_all;
> + apic->send_IPI_self = xen_send_IPI_self;
> }
>
> #endif
> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 5fac691..2dc6628 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -465,8 +465,8 @@ static void xen_smp_send_reschedule(int cpu)
> xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
> }
>
> -static void xen_send_IPI_mask(const struct cpumask *mask,
> - enum ipi_vector vector)
> +static void __xen_send_IPI_mask(const struct cpumask *mask,
> + int vector)
> {
> unsigned cpu;
>
> @@ -478,7 +478,7 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
> {
> int cpu;
>
> - xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
> + __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
>
> /* Make sure other vcpus get a chance to run if they need to. */
> for_each_cpu(cpu, mask) {
> @@ -491,10 +491,83 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
>
> static void xen_smp_send_call_function_single_ipi(int cpu)
> {
> - xen_send_IPI_mask(cpumask_of(cpu),
> + __xen_send_IPI_mask(cpumask_of(cpu),
> XEN_CALL_FUNCTION_SINGLE_VECTOR);
> }
>
> +static inline int xen_map_vector(int vector)
> +{
> + int xen_vector;
> +
> + switch (vector) {
> + case RESCHEDULE_VECTOR:
> + xen_vector = XEN_RESCHEDULE_VECTOR;
> + break;
> + case CALL_FUNCTION_VECTOR:
> + xen_vector = XEN_CALL_FUNCTION_VECTOR;
> + break;
> + case CALL_FUNCTION_SINGLE_VECTOR:
> + xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
> + break;
> + default:
> + xen_vector = -1;
> + printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
> + vector);
> + }
> +
> + return xen_vector;
> +}
> +
> +void xen_send_IPI_mask(const struct cpumask *mask,
> + int vector)
> +{
> + int xen_vector = xen_map_vector(vector);
> +
> + if (xen_vector >= 0)
> + __xen_send_IPI_mask(mask, xen_vector);
> +}
> +
> +void xen_send_IPI_all(int vector)
> +{
> + int xen_vector = xen_map_vector(vector);
> +
> + if (xen_vector >= 0)
> + __xen_send_IPI_mask(cpu_online_mask, xen_vector);
> +}
> +
> +void xen_send_IPI_self(int vector)
> +{
> + int xen_vector = xen_map_vector(vector);
> +
> + if (xen_vector >= 0)
> + xen_send_IPI_one(smp_processor_id(), xen_vector);
> +}
> +
> +void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
> + int vector)
> +{
> + unsigned cpu;
> + unsigned int this_cpu = smp_processor_id();
> +
> + if (!(num_online_cpus() > 1))
> + return;
> +
> + for_each_cpu_and(cpu, mask, cpu_online_mask) {
> + if (this_cpu == cpu)
> + continue;
> +
> + xen_smp_send_call_function_single_ipi(cpu);
> + }
> +}
> +
> +void xen_send_IPI_allbutself(int vector)
> +{
> + int xen_vector = xen_map_vector(vector);
> +
> + if (xen_vector >= 0)
> + xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
> +}
> +
> static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
> {
> irq_enter();
> diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
> new file mode 100644
> index 0000000..8981a76
> --- /dev/null
> +++ b/arch/x86/xen/smp.h
> @@ -0,0 +1,12 @@
> +#ifndef _XEN_SMP_H
> +
> +extern void xen_send_IPI_mask(const struct cpumask *mask,
> + int vector);
> +extern void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
> + int vector);
> +extern void xen_send_IPI_allbutself(int vector);
> +extern void physflat_send_IPI_allbutself(int vector);
> +extern void xen_send_IPI_all(int vector);
> +extern void xen_send_IPI_self(int vector);
> +
> +#endif
> --
> 1.7.2.5
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