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Date: Tue, 15 Jul 2008 10:33:18 -0700
From: Suresh Siddha <suresh.b.siddha@...el.com>
To: Yinghai Lu <yhlu.kernel@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: let 32bit use apic_ops too - fix
On Sun, Jul 13, 2008 at 10:19:35PM -0700, Yinghai Lu wrote:
>
> fix for pv.
>
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>
> ---
> arch/x86/kernel/paravirt.c | 5 ----
> arch/x86/kernel/vmi_32.c | 51 ++++++++++++++++++++++++++++++++++++++++++---
> arch/x86/xen/enlighten.c | 19 +++++++---------
> include/asm-x86/paravirt.h | 29 -------------------------
> 4 files changed, 57 insertions(+), 47 deletions(-)
>
> Index: linux-2.6/arch/x86/kernel/paravirt.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/paravirt.c
> +++ linux-2.6/arch/x86/kernel/paravirt.c
> @@ -373,11 +373,6 @@ struct pv_cpu_ops pv_cpu_ops = {
>
> struct pv_apic_ops pv_apic_ops = {
> #ifdef CONFIG_X86_LOCAL_APIC
> -#ifndef CONFIG_X86_64
> - .apic_write = native_apic_mem_write,
> - .apic_write_atomic = native_apic_mem_write_atomic,
> - .apic_read = native_apic_mem_read,
> -#endif
> .setup_boot_clock = setup_boot_APIC_clock,
> .setup_secondary_clock = setup_secondary_APIC_clock,
> .startup_ipi_hook = paravirt_nop,
> Index: linux-2.6/arch/x86/kernel/vmi_32.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/vmi_32.c
> +++ linux-2.6/arch/x86/kernel/vmi_32.c
> @@ -676,6 +676,50 @@ static inline int __init probe_vmi_rom(v
> return 0;
> }
>
> +#ifdef CONFIG_X86_LOCAL_APIC
> +static u32 vmi_apic_read(u32 reg)
> +{
> + return 0;
> +}
> +
> +static void vmi_apic_write(u32 reg, u32 val)
> +{
> + /* Warn to see if there's any stray references */
> + WARN_ON(1);
> +}
> +
> +static u64 vmi_apic_icr_read(void)
> +{
> + return 0;
> +}
> +
> +static void vmi_apic_icr_write(u32 low, u32 id)
> +{
> + /* Warn to see if there's any stray references */
> + WARN_ON(1);
> +}
> +
> +static void vmi_apic_wait_icr_idle(void)
> +{
> + return;
> +}
> +
> +static u32 vmi_safe_apic_wait_icr_idle(void)
> +{
> + return 0;
> +}
> +
> +static struct apic_ops vmi_basic_apic_ops = {
> + .read = vmi_apic_read,
> + .write = vmi_apic_write,
> + .write_atomic = vmi_apic_write,
> + .icr_read = vmi_apic_icr_read,
> + .icr_write = vmi_apic_icr_write,
> + .wait_icr_idle = vmi_apic_wait_icr_idle,
> + .safe_wait_icr_idle = vmi_safe_apic_wait_icr_idle,
> +};
> +#endif
> +
> /*
> * VMI setup common to all processors
> */
> @@ -904,9 +948,10 @@ static inline int __init activate_vmi(vo
> #endif
>
> #ifdef CONFIG_X86_LOCAL_APIC
> - para_fill(pv_apic_ops.apic_read, APICRead);
> - para_fill(pv_apic_ops.apic_write, APICWrite);
> - para_fill(pv_apic_ops.apic_write_atomic, APICWrite);
> + para_fill(vmi_basic_apic_ops.read, APICRead);
> + para_fill(vmi_basic_apic_ops.write, APICWrite);
> + para_fill(vmi_basic_apic_ops.write_atomic, APICWrite);
> + apic_ops = &vmi_basic_apic_ops;
Yinghai, Looking more closely at this, based on my understanding this might be
wrong for VMI. Correct patch should be as follows. Any comments?
thanks,
suresh
---
Fix VMI apic_ops.
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
---
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index b1375fa..3410196 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -145,6 +145,11 @@ static int modern_apic(void)
return lapic_get_version() >= 0x14;
}
+/*
+ * Paravirt kernels also might be using these below ops. So we still
+ * use generic apic_read()/apic_write(), which might be pointing to different
+ * ops in PARAVIRT case.
+ */
void xapic_wait_icr_idle(void)
{
while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c
index cf30743..d6897e4 100644
--- a/arch/x86/kernel/vmi_32.c
+++ b/arch/x86/kernel/vmi_32.c
@@ -676,50 +676,6 @@ static inline int __init probe_vmi_rom(void)
return 0;
}
-#ifdef CONFIG_X86_LOCAL_APIC
-static u32 vmi_apic_read(u32 reg)
-{
- return 0;
-}
-
-static void vmi_apic_write(u32 reg, u32 val)
-{
- /* Warn to see if there's any stray references */
- WARN_ON(1);
-}
-
-static u64 vmi_apic_icr_read(void)
-{
- return 0;
-}
-
-static void vmi_apic_icr_write(u32 low, u32 id)
-{
- /* Warn to see if there's any stray references */
- WARN_ON(1);
-}
-
-static void vmi_apic_wait_icr_idle(void)
-{
- return;
-}
-
-static u32 vmi_safe_apic_wait_icr_idle(void)
-{
- return 0;
-}
-
-static struct apic_ops vmi_basic_apic_ops = {
- .read = vmi_apic_read,
- .write = vmi_apic_write,
- .write_atomic = vmi_apic_write,
- .icr_read = vmi_apic_icr_read,
- .icr_write = vmi_apic_icr_write,
- .wait_icr_idle = vmi_apic_wait_icr_idle,
- .safe_wait_icr_idle = vmi_safe_apic_wait_icr_idle,
-};
-#endif
-
/*
* VMI setup common to all processors
*/
@@ -948,10 +904,9 @@ static inline int __init activate_vmi(void)
#endif
#ifdef CONFIG_X86_LOCAL_APIC
- para_fill(vmi_basic_apic_ops.read, APICRead);
- para_fill(vmi_basic_apic_ops.write, APICWrite);
- para_fill(vmi_basic_apic_ops.write_atomic, APICWrite);
- apic_ops = &vmi_basic_apic_ops;
+ para_fill(apic_ops->read, APICRead);
+ para_fill(apic_ops->write, APICWrite);
+ para_fill(apic_ops->write_atomic, APICWrite);
#endif
/*
--
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