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    Subject[PATCH 4/5] [PATCH] introduce paravirt helpers
    Date
    Signed-off-by: Glauber Costa <gcosta@redhat.com>
    Signed-off-by: Ravikiran Thirumalai <kiran@scalemp.com>
    Acked-by: Shai Fultheim <shai@scalemp.com>
    ---
    arch/x86/Kconfig | 3 ++
    arch/x86/kernel/vsmp_64.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 58 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 9d0aced..0c4134b 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -323,7 +323,8 @@ config X86_RDC321X
    config X86_VSMP
    bool "Support for ScaleMP vSMP"
    depends on X86_64 && PCI
    - help
    + select PARAVIRT
    + help
    Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
    supposed to run on these EM64T-based machines. Only choose this option
    if you have one of these machines.
    diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
    index fdf9fba..b93ed66 100644
    --- a/arch/x86/kernel/vsmp_64.c
    +++ b/arch/x86/kernel/vsmp_64.c
    @@ -8,6 +8,8 @@
    *
    * Ravikiran Thirumalai <kiran@scalemp.com>,
    * Shai Fultheim <shai@scalemp.com>
    + * Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
    + * Ravikiran Thirumalai <kiran@scalemp.com>
    */

    #include <linux/init.h>
    @@ -15,6 +17,60 @@ #include <linux/pci_ids.h>
    #include <linux/pci_regs.h>
    #include <asm/pci-direct.h>
    #include <asm/io.h>
    +#include <asm/paravirt.h>
    +
    +/*
    + * Interrupt control on vSMPowered systems:
    + * ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
    + * and vice versa.
    + */
    +
    +static unsigned long vsmp_save_fl(void)
    +{
    + unsigned long flags = native_save_fl();
    +
    + if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
    + flags &= ~X86_EFLAGS_IF;
    + return flags;
    +}
    +
    +static void vsmp_restore_fl(unsigned long flags)
    +{
    + if (flags & X86_EFLAGS_IF)
    + flags &= ~X86_EFLAGS_AC;
    + else
    + flags |= X86_EFLAGS_AC;
    + native_restore_fl(flags);
    +}
    +
    +static void vsmp_irq_disable(void)
    +{
    + unsigned long flags = native_save_fl();
    +
    + native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
    +}
    +
    +static void vsmp_irq_enable(void)
    +{
    + unsigned long flags = native_save_fl();
    +
    + native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
    +}
    +
    +static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
    + unsigned long addr, unsigned len)
    +{
    + switch (type) {
    + case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
    + case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
    + case PARAVIRT_PATCH(pv_irq_ops.save_fl):
    + case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
    + return paravirt_patch_default(type, clobbers, ibuf, addr, len);
    + default:
    + return native_patch(type, clobbers, ibuf, addr, len);
    + }
    +
    +}

    void __init vsmp_init(void)
    {
    --
    1.4.2


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