[PATCH] vmi: apic ops

Use para_fill instead of directly setting the APIC ops to the result of the
vmi_get_function call - this allows one to implement a VMI ROM without
implementing APIC functions, just using the native APIC functions.

While doing this, I realized that there is a lot more cleanup that should have
been done.  Basically, we should never assume that the ROM implements a
specific set of functions, and always allow fallback to the native
implementation.

This is critical for future compatibility.

Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/i386/kernel/vmi.c b/arch/i386/kernel/vmi.c
index 30e8253..af8c542 100644 (file)
--- a/arch/i386/kernel/vmi.c
+++ b/arch/i386/kernel/vmi.c
@@ -54,6 +54,7 @@ static int disable_sep;
 static int disable_tsc;
 static int disable_mtrr;
 static int disable_noidle;
+static int disable_vmi_timer;
 
 /* Cached VMI operations */
 struct {
@@ -661,12 +662,12 @@ static inline int __init probe_vmi_rom(void)
 void vmi_bringup(void)
 {
        /* We must establish the lowmem mapping for MMU ops to work */
-       if (vmi_rom)
+       if (vmi_ops.set_linear_mapping)
                vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0);
 }
 
 /*
- * Return a pointer to the VMI function or a NOP stub
+ * Return a pointer to a VMI function or NULL if unimplemented
  */
 static void *vmi_get_function(int vmicall)
 {
@@ -677,12 +678,13 @@ static void *vmi_get_function(int vmicall)
        if (rel->type == VMI_RELOCATION_CALL_REL)
                return (void *)rel->eip;
        else
-               return (void *)vmi_nop;
+               return NULL;
 }
 
 /*
  * Helper macro for making the VMI paravirt-ops fill code readable.
- * For unimplemented operations, fall back to default.
+ * For unimplemented operations, fall back to default, unless nop
+ * is returned by the ROM.
  */
 #define para_fill(opname, vmicall)                             \
 do {                                                           \
@@ -691,9 +693,29 @@ do {                                                               \
        if (rel->type != VMI_RELOCATION_NONE) {                 \
                BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);   \
                paravirt_ops.opname = (void *)rel->eip;         \
+       } else if (rel->type == VMI_RELOCATION_NOP)             \
+               paravirt_ops.opname = (void *)vmi_nop;          \
+} while (0)
+
+/*
+ * Helper macro for making the VMI paravirt-ops fill code readable.
+ * For cached operations which do not match the VMI ROM ABI and must
+ * go through a tranlation stub.  Ignore NOPs, since it is not clear
+ * a NOP * VMI function corresponds to a NOP paravirt-op when the
+ * functions are not in 1-1 correspondence.
+ */
+#define para_wrap(opname, wrapper, cache, vmicall)             \
+do {                                                           \
+       reloc = call_vrom_long_func(vmi_rom, get_reloc,         \
+                                   VMI_CALL_##vmicall);        \
+       BUG_ON(rel->type == VMI_RELOCATION_JUMP_REL);           \
+       if (rel->type == VMI_RELOCATION_CALL_REL) {             \
+               paravirt_ops.opname = wrapper;                  \
+               vmi_ops.cache = (void *)rel->eip;               \
        }                                                       \
 } while (0)
 
+
 /*
  * Activate the VMI interface and switch into paravirtualized mode
  */
@@ -730,13 +752,8 @@ static inline int __init activate_vmi(void)
         *  rdpmc is not yet used in Linux
         */
 
-       /* CPUID is special, so very special */
-       reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_CPUID);
-       if (rel->type != VMI_RELOCATION_NONE) {
-               BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
-               vmi_ops.cpuid = (void *)rel->eip;
-               paravirt_ops.cpuid = vmi_cpuid;
-       }
+       /* CPUID is special, so very special it gets wrapped like a present */
+       para_wrap(cpuid, vmi_cpuid, cpuid, CPUID);
 
        para_fill(clts, CLTS);
        para_fill(get_debugreg, GetDR);
@@ -753,6 +770,7 @@ static inline int __init activate_vmi(void)
        para_fill(restore_fl, SetInterruptMask);
        para_fill(irq_disable, DisableInterrupts);
        para_fill(irq_enable, EnableInterrupts);
+
        /* irq_save_disable !!! sheer pain */
        patch_offset(&irq_save_disable_callout[IRQ_PATCH_INT_MASK],
                     (char *)paravirt_ops.save_fl);
@@ -760,26 +778,18 @@ static inline int __init activate_vmi(void)
                     (char *)paravirt_ops.irq_disable);
 
        para_fill(wbinvd, WBINVD);
+       para_fill(read_tsc, RDTSC);
+
+       /* The following we emulate with trap and emulate for now */
        /* paravirt_ops.read_msr = vmi_rdmsr */
        /* paravirt_ops.write_msr = vmi_wrmsr */
-       para_fill(read_tsc, RDTSC);
        /* paravirt_ops.rdpmc = vmi_rdpmc */
 
-       /* TR interface doesn't pass TR value */
-       reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetTR);
-       if (rel->type != VMI_RELOCATION_NONE) {
-               BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
-               vmi_ops.set_tr = (void *)rel->eip;
-               paravirt_ops.load_tr_desc = vmi_set_tr;
-       }
+       /* TR interface doesn't pass TR value, wrap */
+       para_wrap(load_tr_desc, vmi_set_tr, set_tr, SetTR);
 
        /* LDT is special, too */
-       reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetLDT);
-       if (rel->type != VMI_RELOCATION_NONE) {
-               BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
-               vmi_ops._set_ldt = (void *)rel->eip;
-               paravirt_ops.set_ldt = vmi_set_ldt;
-       }
+       para_wrap(set_ldt, vmi_set_ldt, _set_ldt, SetLDT);
 
        para_fill(load_gdt, SetGDT);
        para_fill(load_idt, SetIDT);
@@ -790,25 +800,14 @@ static inline int __init activate_vmi(void)
        para_fill(write_ldt_entry, WriteLDTEntry);
        para_fill(write_gdt_entry, WriteGDTEntry);
        para_fill(write_idt_entry, WriteIDTEntry);
-       reloc = call_vrom_long_func(vmi_rom, get_reloc,
-                                   VMI_CALL_UpdateKernelStack);
-       if (rel->type != VMI_RELOCATION_NONE) {
-               BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
-               vmi_ops.set_kernel_stack = (void *)rel->eip;
-               paravirt_ops.load_esp0 = vmi_load_esp0;
-       }
-
+       para_wrap(load_esp0, vmi_load_esp0, set_kernel_stack, UpdateKernelStack);
        para_fill(set_iopl_mask, SetIOPLMask);
-       paravirt_ops.io_delay = (void *)vmi_nop;
-
+       para_fill(io_delay, IODelay);
        para_fill(set_lazy_mode, SetLazyMode);
 
-       reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_FlushTLB);
-       if (rel->type != VMI_RELOCATION_NONE) {
-               vmi_ops.flush_tlb = (void *)rel->eip;
-               paravirt_ops.flush_tlb_user = vmi_flush_tlb_user;
-               paravirt_ops.flush_tlb_kernel = vmi_flush_tlb_kernel;
-       }
+       /* user and kernel flush are just handled with different flags to FlushTLB */
+       para_wrap(flush_tlb_user, vmi_flush_tlb_user, flush_tlb, FlushTLB);
+       para_wrap(flush_tlb_kernel, vmi_flush_tlb_kernel, flush_tlb, FlushTLB);
        para_fill(flush_tlb_single, InvalPage);
 
        /*
@@ -823,28 +822,40 @@ static inline int __init activate_vmi(void)
        vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxE);
        vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxE);
 #endif
-       vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
-       vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
-       vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
 
-       paravirt_ops.map_pt_hook = vmi_map_pt_hook;
-       paravirt_ops.alloc_pt = vmi_allocate_pt;
-       paravirt_ops.alloc_pd = vmi_allocate_pd;
-       paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
-       paravirt_ops.release_pt = vmi_release_pt;
-       paravirt_ops.release_pd = vmi_release_pd;
-       paravirt_ops.set_pte = vmi_set_pte;
-       paravirt_ops.set_pte_at = vmi_set_pte_at;
-       paravirt_ops.set_pmd = vmi_set_pmd;
-       paravirt_ops.pte_update = vmi_update_pte;
-       paravirt_ops.pte_update_defer = vmi_update_pte_defer;
+       if (vmi_ops.set_pte) {
+               paravirt_ops.set_pte = vmi_set_pte;
+               paravirt_ops.set_pte_at = vmi_set_pte_at;
+               paravirt_ops.set_pmd = vmi_set_pmd;
 #ifdef CONFIG_X86_PAE
-       paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
-       paravirt_ops.set_pte_present = vmi_set_pte_present;
-       paravirt_ops.set_pud = vmi_set_pud;
-       paravirt_ops.pte_clear = vmi_pte_clear;
-       paravirt_ops.pmd_clear = vmi_pmd_clear;
+               paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
+               paravirt_ops.set_pte_present = vmi_set_pte_present;
+               paravirt_ops.set_pud = vmi_set_pud;
+               paravirt_ops.pte_clear = vmi_pte_clear;
+               paravirt_ops.pmd_clear = vmi_pmd_clear;
 #endif
+       }
+
+       if (vmi_ops.update_pte) {
+               paravirt_ops.pte_update = vmi_update_pte;
+               paravirt_ops.pte_update_defer = vmi_update_pte_defer;
+       }
+
+       vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
+       if (vmi_ops.allocate_page) {
+               paravirt_ops.alloc_pt = vmi_allocate_pt;
+               paravirt_ops.alloc_pd = vmi_allocate_pd;
+               paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
+       }
+
+       vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
+       if (vmi_ops.release_page) {
+               paravirt_ops.release_pt = vmi_release_pt;
+               paravirt_ops.release_pd = vmi_release_pd;
+       }
+       para_wrap(map_pt_hook, vmi_map_pt_hook, set_linear_mapping,
+                 SetLinearMapping);
+
        /*
         * These MUST always be patched.  Don't support indirect jumps
         * through these operations, as the VMI interface may use either
@@ -856,21 +867,20 @@ static inline int __init activate_vmi(void)
        paravirt_ops.iret = (void *)0xbadbab0;
 
 #ifdef CONFIG_SMP
-       paravirt_ops.startup_ipi_hook = vmi_startup_ipi_hook;
-       vmi_ops.set_initial_ap_state = vmi_get_function(VMI_CALL_SetInitialAPState);
+       para_wrap(startup_ipi_hook, vmi_startup_ipi_hook, set_initial_ap_state, SetInitialAPState);
 #endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
-       paravirt_ops.apic_read = vmi_get_function(VMI_CALL_APICRead);
-       paravirt_ops.apic_write = vmi_get_function(VMI_CALL_APICWrite);
-       paravirt_ops.apic_write_atomic = vmi_get_function(VMI_CALL_APICWrite);
+       para_fill(apic_read, APICRead);
+       para_fill(apic_write, APICWrite);
+       para_fill(apic_write_atomic, APICWrite);
 #endif
 
        /*
         * Check for VMI timer functionality by probing for a cycle frequency method
         */
        reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_GetCycleFrequency);
-       if (rel->type != VMI_RELOCATION_NONE) {
+       if (!disable_vmi_timer && rel->type != VMI_RELOCATION_NONE) {
                vmi_timer_ops.get_cycle_frequency = (void *)rel->eip;
                vmi_timer_ops.get_cycle_counter =
                        vmi_get_function(VMI_CALL_GetCycleCounter);
@@ -890,13 +900,19 @@ static inline int __init activate_vmi(void)
 #endif
                paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles;
                paravirt_ops.get_cpu_khz = vmi_cpu_khz;
+
+               /* We have true wallclock functions; disable CMOS clock sync */
+               no_sync_cmos_clock = 1;
+       } else {
+               disable_noidle = 1;
+               disable_vmi_timer = 1;
        }
-       if (!disable_noidle)
+
+       /* No idle HZ mode only works if VMI timer and no idle is enabled */
+       if (disable_noidle || disable_vmi_timer)
                para_fill(safe_halt, Halt);
-       else {
-               vmi_ops.halt = vmi_get_function(VMI_CALL_Halt);
-               paravirt_ops.safe_halt = vmi_safe_halt;
-       }
+       else
+               para_wrap(safe_halt, vmi_safe_halt, halt, Halt);
 
        /*
         * Alternative instruction rewriting doesn't happen soon enough
@@ -932,10 +948,9 @@ void __init vmi_init(void)
        activate_vmi();
 
 #ifdef CONFIG_X86_IO_APIC
+       /* This is virtual hardware; timer routing is wired correctly */
        no_timer_check = 1;
 #endif
-       no_sync_cmos_clock = 1;
-
        local_irq_restore(flags & X86_EFLAGS_IF);
 }
 
@@ -959,6 +974,9 @@ static int __init parse_vmi(char *arg)
        } else if (!strcmp(arg, "disable_mtrr")) {
                clear_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability);
                disable_mtrr = 1;
+       } else if (!strcmp(arg, "disable_timer")) {
+               disable_vmi_timer = 1;
+               disable_noidle = 1;
        } else if (!strcmp(arg, "disable_noidle"))
                disable_noidle = 1;
        return 0;

diff --git a/include/asm-i386/vmi.h b/include/asm-i386/vmi.h
index 43c8933..eb8bd89 100644 (file)
--- a/include/asm-i386/vmi.h
+++ b/include/asm-i386/vmi.h
@@ -97,6 +97,7 @@
 #define VMI_CALL_SetInitialAPState     62
 #define VMI_CALL_APICWrite             63
 #define VMI_CALL_APICRead              64
+#define VMI_CALL_IODelay               65
 #define VMI_CALL_SetLazyMode           73
 
 /*