forked from Minki/linux
Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: lguest: fix irq vectors. lguest: fix early_ioremap. lguest: fix example launcher compile after moved asm-x86 dir.
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commit
f2347dfcd1
@ -1,5 +1,5 @@
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# This creates the demonstration utility "lguest" which runs a Linux guest.
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CFLAGS:=-Wall -Wmissing-declarations -Wmissing-prototypes -O3 -I../../include
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CFLAGS:=-Wall -Wmissing-declarations -Wmissing-prototypes -O3 -I../../include -I../../arch/x86/include
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LDLIBS:=-lz
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all: lguest
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@ -44,7 +44,7 @@
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#include "linux/virtio_console.h"
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#include "linux/virtio_rng.h"
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#include "linux/virtio_ring.h"
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#include "asm-x86/bootparam.h"
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#include "asm/bootparam.h"
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/*L:110 We can ignore the 39 include files we need for this program, but I do
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* want to draw attention to the use of kernel-style types.
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*
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@ -367,10 +367,9 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx,
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* lazily after a task switch, and Linux uses that gratefully, but wouldn't a
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* name like "FPUTRAP bit" be a little less cryptic?
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*
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* We store cr0 (and cr3) locally, because the Host never changes it. The
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* Guest sometimes wants to read it and we'd prefer not to bother the Host
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* unnecessarily. */
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static unsigned long current_cr0, current_cr3;
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* We store cr0 locally because the Host never changes it. The Guest sometimes
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* wants to read it and we'd prefer not to bother the Host unnecessarily. */
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static unsigned long current_cr0;
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static void lguest_write_cr0(unsigned long val)
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{
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lazy_hcall(LHCALL_TS, val & X86_CR0_TS, 0, 0);
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@ -399,17 +398,23 @@ static unsigned long lguest_read_cr2(void)
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return lguest_data.cr2;
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}
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/* See lguest_set_pte() below. */
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static bool cr3_changed = false;
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/* cr3 is the current toplevel pagetable page: the principle is the same as
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* cr0. Keep a local copy, and tell the Host when it changes. */
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* cr0. Keep a local copy, and tell the Host when it changes. The only
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* difference is that our local copy is in lguest_data because the Host needs
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* to set it upon our initial hypercall. */
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static void lguest_write_cr3(unsigned long cr3)
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{
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lguest_data.pgdir = cr3;
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lazy_hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0);
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current_cr3 = cr3;
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cr3_changed = true;
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}
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static unsigned long lguest_read_cr3(void)
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{
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return current_cr3;
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return lguest_data.pgdir;
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}
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/* cr4 is used to enable and disable PGE, but we don't care. */
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@ -498,13 +503,13 @@ static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval)
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* to forget all of them. Fortunately, this is very rare.
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*
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* ... except in early boot when the kernel sets up the initial pagetables,
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* which makes booting astonishingly slow. So we don't even tell the Host
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* anything changed until we've done the first page table switch. */
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* which makes booting astonishingly slow: 1.83 seconds! So we don't even tell
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* the Host anything changed until we've done the first page table switch,
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* which brings boot back to 0.25 seconds. */
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static void lguest_set_pte(pte_t *ptep, pte_t pteval)
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{
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*ptep = pteval;
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/* Don't bother with hypercall before initial setup. */
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if (current_cr3)
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if (cr3_changed)
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lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0);
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}
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@ -521,7 +526,7 @@ static void lguest_set_pte(pte_t *ptep, pte_t pteval)
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static void lguest_flush_tlb_single(unsigned long addr)
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{
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/* Simply set it to zero: if it was not, it will fault back in. */
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lazy_hcall(LHCALL_SET_PTE, current_cr3, addr, 0);
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lazy_hcall(LHCALL_SET_PTE, lguest_data.pgdir, addr, 0);
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}
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/* This is what happens after the Guest has removed a large number of entries.
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@ -581,6 +586,9 @@ static void __init lguest_init_IRQ(void)
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for (i = 0; i < LGUEST_IRQS; i++) {
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int vector = FIRST_EXTERNAL_VECTOR + i;
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/* Some systems map "vectors" to interrupts weirdly. Lguest has
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* a straightforward 1 to 1 mapping, so force that here. */
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__get_cpu_var(vector_irq)[vector] = i;
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if (vector != SYSCALL_VECTOR) {
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set_intr_gate(vector, interrupt[vector]);
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set_irq_chip_and_handler_name(i, &lguest_irq_controller,
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