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Commit ae3749dc authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Rusty Russell
Browse files

lguest: move changed bitmap to lg_cpu 



events represented in the 'changed' bitmap are per-cpu, not per-guest.
move it to the lg_cpu structure

Signed-off-by: default avatarGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent f34f8c5f

drivers/lguest/interrupts_and_traps.c

+1 −1
Original line number Diff line number Diff line
@@ -395,7 +395,7 @@ void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int num, u32 lo, u32 hi) 


	/* Mark the IDT as changed: next time the Guest runs we'll know we have

	 * to copy this again. */

	cpu->lg->changed |= CHANGED_IDT;

	cpu->changed |= CHANGED_IDT;



	/* Check that the Guest doesn't try to step outside the bounds. */

	if (num >= ARRAY_SIZE(cpu->arch.idt))

drivers/lguest/lg.h

+3 −3
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ struct lg_cpu { 
	u32 esp1;

	u8 ss1;



	/* Bitmap of what has changed: see CHANGED_* above. */

	int changed;



	unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */



	/* At end of a page shared mapped over lguest_pages in guest.  */
@@ -92,9 +95,6 @@ struct lguest 
	void __user *mem_base;

	unsigned long kernel_address;



	/* Bitmap of what has changed: see CHANGED_* above. */

	int changed;



	struct pgdir pgdirs[4];



	unsigned long noirq_start, noirq_end;

drivers/lguest/segments.c

+2 −2
Original line number Diff line number Diff line
@@ -159,7 +159,7 @@ void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num) 
	fixup_gdt_table(cpu, 0, ARRAY_SIZE(cpu->arch.gdt));

	/* Mark that the GDT changed so the core knows it has to copy it again,

	 * even if the Guest is run on the same CPU. */

	lg->changed |= CHANGED_GDT;

	cpu->changed |= CHANGED_GDT;

}



/* This is the fast-track version for just changing the three TLS entries.
@@ -174,7 +174,7 @@ void guest_load_tls(struct lg_cpu *cpu, unsigned long gtls) 
	__lgread(lg, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES);

	fixup_gdt_table(cpu, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1);

	/* Note that just the TLS entries have changed. */

	lg->changed |= CHANGED_GDT_TLS;

	cpu->changed |= CHANGED_GDT_TLS;

}

/*:*/

drivers/lguest/x86/core.c

+5 −6
Original line number Diff line number Diff line
@@ -75,7 +75,6 @@ static DEFINE_PER_CPU(struct lg_cpu *, last_cpu); 
 */

static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)

{

	struct lguest *lg = cpu->lg;

	/* Copying all this data can be quite expensive.  We usually run the

	 * same Guest we ran last time (and that Guest hasn't run anywhere else

	 * meanwhile).  If that's not the case, we pretend everything in the
@@ -83,7 +82,7 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) 
	if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) {

		__get_cpu_var(last_cpu) = cpu;

		cpu->last_pages = pages;

		lg->changed = CHANGED_ALL;

		cpu->changed = CHANGED_ALL;

	}



	/* These copies are pretty cheap, so we do them unconditionally: */
@@ -99,18 +98,18 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) 
	pages->state.guest_tss.ss1 = cpu->ss1;



	/* Copy direct-to-Guest trap entries. */

	if (lg->changed & CHANGED_IDT)

	if (cpu->changed & CHANGED_IDT)

		copy_traps(cpu, pages->state.guest_idt, default_idt_entries);



	/* Copy all GDT entries which the Guest can change. */

	if (lg->changed & CHANGED_GDT)

	if (cpu->changed & CHANGED_GDT)

		copy_gdt(cpu, pages->state.guest_gdt);

	/* If only the TLS entries have changed, copy them. */

	else if (lg->changed & CHANGED_GDT_TLS)

	else if (cpu->changed & CHANGED_GDT_TLS)

		copy_gdt_tls(cpu, pages->state.guest_gdt);



	/* Mark the Guest as unchanged for next time. */

	lg->changed = 0;

	cpu->changed = 0;

}



/* Finally: the code to actually call into the Switcher to run the Guest. */