diff options
| -rw-r--r-- | Documentation/lguest/lguest.c | 12 | ||||
| -rw-r--r-- | drivers/char/hvc_lguest.c | 3 | ||||
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 14 | ||||
| -rw-r--r-- | drivers/lguest/io.c | 10 | ||||
| -rw-r--r-- | drivers/lguest/lguest.c | 8 | ||||
| -rw-r--r-- | drivers/lguest/lguest_asm.S | 14 | ||||
| -rw-r--r-- | drivers/lguest/page_tables.c | 5 | ||||
| -rw-r--r-- | drivers/lguest/segments.c | 4 | ||||
| -rw-r--r-- | drivers/net/lguest_net.c | 19 |
9 files changed, 89 insertions, 0 deletions
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c index d7e26f025959..f7918401a007 100644 --- a/Documentation/lguest/lguest.c +++ b/Documentation/lguest/lguest.c @@ -1510,3 +1510,15 @@ int main(int argc, char *argv[]) /* Finally, run the Guest. This doesn't return. */ run_guest(lguest_fd, &device_list); } +/*:*/ + +/*M:999 + * Mastery is done: you now know everything I do. + * + * But surely you have seen code, features and bugs in your wanderings which + * you now yearn to attack? That is the real game, and I look forward to you + * patching and forking lguest into the Your-Name-Here-visor. + * + * Farewell, and good coding! + * Rusty Russell. + */ diff --git a/drivers/char/hvc_lguest.c b/drivers/char/hvc_lguest.c index 1de8967cce06..feeccbaec438 100644 --- a/drivers/char/hvc_lguest.c +++ b/drivers/char/hvc_lguest.c @@ -13,6 +13,9 @@ * functions. :*/ +/*M:002 The console can be flooded: while the Guest is processing input the + * Host can send more. Buffering in the Host could alleviate this, but it is a + * difficult problem in general. :*/ /* Copyright (C) 2006 Rusty Russell, IBM Corporation * * This program is free software; you can redistribute it and/or modify diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 3d9830322646..bd0091bf79ec 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -231,6 +231,20 @@ static int direct_trap(const struct lguest *lg, * go direct, of course 8) */ return idt_type(trap->a, trap->b) == 0xF; } +/*:*/ + +/*M:005 The Guest has the ability to turn its interrupt gates into trap gates, + * if it is careful. The Host will let trap gates can go directly to the + * Guest, but the Guest needs the interrupts atomically disabled for an + * interrupt gate. It can do this by pointing the trap gate at instructions + * within noirq_start and noirq_end, where it can safely disable interrupts. */ + +/*M:006 The Guests do not use the sysenter (fast system call) instruction, + * because it's hardcoded to enter privilege level 0 and so can't go direct. + * It's about twice as fast as the older "int 0x80" system call, so it might + * still be worthwhile to handle it in the Switcher and lcall down to the + * Guest. The sysenter semantics are hairy tho: search for that keyword in + * entry.S :*/ /*H:260 When we make traps go directly into the Guest, we need to make sure * the kernel stack is valid (ie. mapped in the page tables). Otherwise, the diff --git a/drivers/lguest/io.c b/drivers/lguest/io.c index da288128e44f..ea68613b43f6 100644 --- a/drivers/lguest/io.c +++ b/drivers/lguest/io.c @@ -553,6 +553,16 @@ void release_all_dma(struct lguest *lg) up_read(&lg->mm->mmap_sem); } +/*M:007 We only return a single DMA buffer to the Launcher, but it would be + * more efficient to return a pointer to the entire array of DMA buffers, which + * it can cache and choose one whenever it wants. + * + * Currently the Launcher uses a write to /dev/lguest, and the return value is + * the address of the DMA structure with the interrupt number placed in + * dma->used_len. If we wanted to return the entire array, we need to return + * the address, array size and interrupt number: this seems to require an + * ioctl(). :*/ + /*L:320 This routine looks for a DMA buffer registered by the Guest on the * given key (using the BIND_DMA hypercall). */ unsigned long get_dma_buffer(struct lguest *lg, diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index 7e7e9fb3aefd..6dfe568523a2 100644 --- a/drivers/lguest/lguest.c +++ b/drivers/lguest/lguest.c @@ -250,6 +250,14 @@ static void irq_enable(void) { lguest_data.irq_enabled = X86_EFLAGS_IF; } +/*:*/ +/*M:003 Note that we don't check for outstanding interrupts when we re-enable + * them (or when we unmask an interrupt). This seems to work for the moment, + * since interrupts are rare and we'll just get the interrupt on the next timer + * tick, but when we turn on CONFIG_NO_HZ, we should revisit this. One way + * would be to put the "irq_enabled" field in a page by itself, and have the + * Host write-protect it when an interrupt comes in when irqs are disabled. + * There will then be a page fault as soon as interrupts are re-enabled. :*/ /*G:034 * The Interrupt Descriptor Table (IDT). diff --git a/drivers/lguest/lguest_asm.S b/drivers/lguest/lguest_asm.S index 3126ae923cc0..f182c6a36209 100644 --- a/drivers/lguest/lguest_asm.S +++ b/drivers/lguest/lguest_asm.S @@ -39,6 +39,20 @@ LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax) .global lguest_noirq_start .global lguest_noirq_end +/*M:004 When the Host reflects a trap or injects an interrupt into the Guest, + * it sets the eflags interrupt bit on the stack based on + * lguest_data.irq_enabled, so the Guest iret logic does the right thing when + * restoring it. However, when the Host sets the Guest up for direct traps, + * such as system calls, the processor is the one to push eflags onto the + * stack, and the interrupt bit will be 1 (in reality, interrupts are always + * enabled in the Guest). + * + * This turns out to be harmless: the only trap which should happen under Linux + * with interrupts disabled is Page Fault (due to our lazy mapping of vmalloc + * regions), which has to be reflected through the Host anyway. If another + * trap *does* go off when interrupts are disabled, the Guest will panic, and + * we'll never get to this iret! :*/ + /*G:045 There is one final paravirt_op that the Guest implements, and glancing * at it you can see why I left it to last. It's *cool*! It's in *assembler*! * diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index cd047e81cd63..b7a924ace684 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -15,6 +15,11 @@ #include <asm/tlbflush.h> #include "lg.h" +/*M:008 We hold reference to pages, which prevents them from being swapped. + * It'd be nice to have a callback in the "struct mm_struct" when Linux wants + * to swap out. If we had this, and a shrinker callback to trim PTE pages, we + * could probably consider launching Guests as non-root. :*/ + /*H:300 * The Page Table Code * diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c index 4d4e5a4586f9..f675a41a80da 100644 --- a/drivers/lguest/segments.c +++ b/drivers/lguest/segments.c @@ -94,6 +94,10 @@ static void check_segment_use(struct lguest *lg, unsigned int desc) || lg->regs->ss / 8 == desc) kill_guest(lg, "Removed live GDT entry %u", desc); } +/*:*/ +/*M:009 We wouldn't need to check for removal of in-use segments if we handled + * faults in the Switcher. However, it's probably not a worthwhile + * optimization. :*/ /*H:610 Once the GDT has been changed, we look through the changed entries and * see if they're OK. If not, we'll call kill_guest() and the Guest will never diff --git a/drivers/net/lguest_net.c b/drivers/net/lguest_net.c index 20df6a848923..cab57911a80e 100644 --- a/drivers/net/lguest_net.c +++ b/drivers/net/lguest_net.c @@ -35,6 +35,25 @@ #define MAX_LANS 4 #define NUM_SKBS 8 +/*M:011 Network code master Jeff Garzik points out numerous shortcomings in + * this driver if it aspires to greatness. + * + * Firstly, it doesn't use "NAPI": the networking's New API, and is poorer for + * it. As he says "NAPI means system-wide load leveling, across multiple + * network interfaces. Lack of NAPI can mean competition at higher loads." + * + * He also points out that we don't implement set_mac_address, so users cannot + * change the devices hardware address. When I asked why one would want to: + * "Bonding, and situations where you /do/ want the MAC address to "leak" out + * of the host onto the wider net." + * + * Finally, he would like module unloading: "It is not unrealistic to think of + * [un|re|]loading the net support module in an lguest guest. And, adding + * module support makes the programmer more responsible, because they now have + * to learn to clean up after themselves. Any driver that cannot clean up + * after itself is an incomplete driver in my book." + :*/ + /*D:530 The "struct lguestnet_info" contains all the information we need to * know about the network device. */ struct lguestnet_info |