diff options
Diffstat (limited to 'drivers/lguest')
| -rw-r--r-- | drivers/lguest/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 7 | ||||
| -rw-r--r-- | drivers/lguest/lguest.c | 7 | ||||
| -rw-r--r-- | drivers/lguest/lguest_asm.S | 6 |
4 files changed, 13 insertions, 9 deletions
diff --git a/drivers/lguest/Kconfig b/drivers/lguest/Kconfig index fd6925f..41e2250 100644 --- a/drivers/lguest/Kconfig +++ b/drivers/lguest/Kconfig @@ -1,6 +1,6 @@ config LGUEST tristate "Linux hypervisor example code" - depends on X86 && PARAVIRT && EXPERIMENTAL && !X86_PAE + depends on X86 && PARAVIRT && EXPERIMENTAL && !X86_PAE && FUTEX select LGUEST_GUEST select HVC_DRIVER ---help--- diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 49aa555..3973123 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -270,8 +270,11 @@ void pin_stack_pages(struct lguest *lg) /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or * two pages of stack space. */ for (i = 0; i < lg->stack_pages; i++) - /* The stack grows *upwards*, hence the subtraction */ - pin_page(lg, lg->esp1 - i * PAGE_SIZE); + /* The stack grows *upwards*, so the address we're given is the + * start of the page after the kernel stack. Subtract one to + * get back onto the first stack page, and keep subtracting to + * get to the rest of the stack pages. */ + pin_page(lg, lg->esp1 - 1 - i * PAGE_SIZE); } /* Direct traps also mean that we need to know whenever the Guest wants to use diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index 6e135ac..ee1c6d0 100644 --- a/drivers/lguest/lguest.c +++ b/drivers/lguest/lguest.c @@ -964,11 +964,12 @@ __init void lguest_init(void *boot) { /* Copy boot parameters first: the Launcher put the physical location * in %esi, and head.S converted that to a virtual address and handed - * it to us. */ - memcpy(&boot_params, boot, PARAM_SIZE); + * it to us. We use "__memcpy" because "memcpy" sometimes tries to do + * tricky things to go faster, and we're not ready for that. */ + __memcpy(&boot_params, boot, PARAM_SIZE); /* The boot parameters also tell us where the command-line is: save * that, too. */ - memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr), + __memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr), COMMAND_LINE_SIZE); /* We're under lguest, paravirt is enabled, and we're running at diff --git a/drivers/lguest/lguest_asm.S b/drivers/lguest/lguest_asm.S index f182c6a..1ddcd5c 100644 --- a/drivers/lguest/lguest_asm.S +++ b/drivers/lguest/lguest_asm.S @@ -22,8 +22,9 @@ jmp lguest_init /*G:055 We create a macro which puts the assembler code between lgstart_ and - * lgend_ markers. These templates end up in the .init.text section, so they - * are discarded after boot. */ + * lgend_ markers. These templates are put in the .text section: they can't be + * discarded after boot as we may need to patch modules, too. */ +.text #define LGUEST_PATCH(name, insns...) \ lgstart_##name: insns; lgend_##name:; \ .globl lgstart_##name; .globl lgend_##name @@ -34,7 +35,6 @@ LGUEST_PATCH(popf, movl %eax, lguest_data+LGUEST_DATA_irq_enabled) LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax) /*:*/ -.text /* These demark the EIP range where host should never deliver interrupts. */ .global lguest_noirq_start .global lguest_noirq_end |
