[PATCH] i386: Implement vmi_kmap_atomic_pte

Implement vmi_kmap_atomic_pte in terms of the backend set_linear_mapping
operation.  The conversion is rather straighforward; call kmap_atomic
and then inform the hypervisor of the page mapping.

The _flush_tlb damage is due to macros being pulled in from highmem.h.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 22 insertions, 12 deletions

diff --git a/arch/i386/kernel/vmi.c b/arch/i386/kernel/vmi.c
index 12312988c626..0df0b2cd3617 100644
--- a/arch/i386/kernel/vmi.c
+++ b/arch/i386/kernel/vmi.c
@@ -26,6 +26,7 @@
 #include <linux/cpu.h>
 #include <linux/bootmem.h>
 #include <linux/mm.h>
+#include <linux/highmem.h>
 #include <asm/vmi.h>
 #include <asm/io.h>
 #include <asm/fixmap.h>
@@ -65,8 +66,8 @@ static struct {
         void (*release_page)(u32, u32);
         void (*set_pte)(pte_t, pte_t *, unsigned);
         void (*update_pte)(pte_t *, unsigned);
-        void (*set_linear_mapping)(int, u32, u32, u32);
-        void (*flush_tlb)(int);
+        void (*set_linear_mapping)(int, void *, u32, u32);
+        void (*_flush_tlb)(int);
         void (*set_initial_ap_state)(int, int);
         void (*halt)(void);
         void (*set_lazy_mode)(int mode);
@@ -221,12 +222,12 @@ static void vmi_load_esp0(struct tss_struct *tss,
 
 static void vmi_flush_tlb_user(void)
 {
-        vmi_ops.flush_tlb(VMI_FLUSH_TLB);
+        vmi_ops._flush_tlb(VMI_FLUSH_TLB);
 }
 
 static void vmi_flush_tlb_kernel(void)
 {
-        vmi_ops.flush_tlb(VMI_FLUSH_TLB | VMI_FLUSH_GLOBAL);
+        vmi_ops._flush_tlb(VMI_FLUSH_TLB | VMI_FLUSH_GLOBAL);
 }
 
 /* Stub to do nothing at all; used for delays and unimplemented calls */
@@ -349,8 +350,11 @@ static void vmi_check_page_type(u32 pfn, int type)
 #define vmi_check_page_type(p,t) do { } while (0)
 #endif
 
-static void vmi_map_pt_hook(int type, pte_t *va, u32 pfn)
+#ifdef CONFIG_HIGHPTE
+static void *vmi_kmap_atomic_pte(struct page *page, enum km_type type)
 {
+        void *va = kmap_atomic(page, type);
+
         /*
          * Internally, the VMI ROM must map virtual addresses to physical
          * addresses for processing MMU updates.  By the time MMU updates
@@ -364,8 +368,11 @@ static void vmi_map_pt_hook(int type, pte_t *va, u32 pfn)
          *  args:                 SLOT                 VA    COUNT PFN
          */
         BUG_ON(type != KM_PTE0 && type != KM_PTE1);
-        vmi_ops.set_linear_mapping((type - KM_PTE0)+1, (u32)va, 1, pfn);
+        vmi_ops.set_linear_mapping((type - KM_PTE0)+1, va, 1, page_to_pfn(page));
+
+        return va;
 }
+#endif
 
 static void vmi_allocate_pt(u32 pfn)
 {
@@ -660,7 +667,7 @@ void vmi_bringup(void)
 {
         /* We must establish the lowmem mapping for MMU ops to work */
         if (vmi_ops.set_linear_mapping)
-                vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0);
+                vmi_ops.set_linear_mapping(0, (void *)__PAGE_OFFSET, max_low_pfn, 0);
 }
 
 /*
@@ -800,8 +807,8 @@ static inline int __init activate_vmi(void)
         para_wrap(set_lazy_mode, vmi_set_lazy_mode, set_lazy_mode, SetLazyMode);
 
         /* 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_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);
 
         /*
@@ -847,9 +854,12 @@ static inline int __init activate_vmi(void)
                 paravirt_ops.release_pt = vmi_release_pt;
                 paravirt_ops.release_pd = vmi_release_pd;
         }
-#if 0
-        para_wrap(map_pt_hook, vmi_map_pt_hook, set_linear_mapping,
-                  SetLinearMapping);
+
+        /* Set linear is needed in all cases */
+        vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
+#ifdef CONFIG_HIGHPTE
+        if (vmi_ops.set_linear_mapping)
+                paravirt_ops.kmap_atomic_pte = vmi_kmap_atomic_pte;
 #endif
 
         /*