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kvm tools: Implement keyboard reset method

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Implement the keyboard reset method which allows guest kernel
to reboot the guest using the keyboard controller.

This will allow guest kernel to reboot the guest when it needs to,
for example - kernel panic (when passing "panic=1" as kernel parameter).

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Sasha Levin
2011-06-17 16:41:28 -04:00
committed by Will Deacon
parent b4422bf37b
commit 714e5b7f9c
4 changed files with 18 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
hw/i8042.c
+7 -2
View File
@@ -5,6 +5,7 @@
#include "kvm/term.h"
#include "kvm/kvm.h"
#include "kvm/i8042.h"
#include "kvm/kvm-cpu.h"
#include <stdint.h>
@@ -30,6 +31,7 @@
#define I8042_CMD_AUX_TEST 0xA9
#define I8042_CMD_AUX_DISABLE 0xA7
#define I8042_CMD_AUX_ENABLE 0xA8
#define I8042_CMD_SYSTEM_RESET 0xFE
#define RESPONSE_ACK 0xFA
@@ -138,7 +140,7 @@ void kbd_queue(u8 c)
kbd_update_irq();
}
static void kbd_write_command(u8 val)
static void kbd_write_command(struct kvm *kvm, u8 val)
{
switch (val) {
case I8042_CMD_CTL_RCTR:
@@ -159,6 +161,9 @@ static void kbd_write_command(u8 val)
case I8042_CMD_AUX_ENABLE:
state.mode &= ~MODE_DISABLE_AUX;
break;
case I8042_CMD_SYSTEM_RESET:
kvm_cpu__reboot();
break;
default:
break;
}
@@ -314,7 +319,7 @@ static bool kbd_out(struct ioport *ioport, struct kvm *kvm, u16 port, void *data
switch (port) {
case I8042_COMMAND_REG: {
u8 value = ioport__read8(data);
kbd_write_command(value);
kbd_write_command(kvm, value);
break;
}
case I8042_DATA_REG: {
include/kvm/kvm-cpu.h
+1
View File
@@ -34,6 +34,7 @@ void kvm_cpu__reset_vcpu(struct kvm_cpu *vcpu);
void kvm_cpu__setup_cpuid(struct kvm_cpu *vcpu);
void kvm_cpu__enable_singlestep(struct kvm_cpu *vcpu);
void kvm_cpu__run(struct kvm_cpu *vcpu);
void kvm_cpu__reboot(void);
int kvm_cpu__start(struct kvm_cpu *cpu);
void kvm_cpu__show_code(struct kvm_cpu *vcpu);
kvm-cpu.c
+7 -1
View File
@@ -16,6 +16,7 @@
#define PAGE_SIZE (sysconf(_SC_PAGE_SIZE))
extern struct kvm_cpu *kvm_cpus[KVM_NR_CPUS];
extern __thread struct kvm_cpu *current_kvm_cpu;
static inline bool is_in_protected_mode(struct kvm_cpu *vcpu)
@@ -393,7 +394,7 @@ void kvm_cpu__run(struct kvm_cpu *vcpu)
static void kvm_cpu_signal_handler(int signum)
{
if (signum == SIGKVMEXIT) {
if (current_kvm_cpu->is_running) {
if (current_kvm_cpu && current_kvm_cpu->is_running) {
current_kvm_cpu->is_running = false;
pthread_kill(pthread_self(), SIGKVMEXIT);
}
@@ -418,6 +419,11 @@ static void kvm_cpu__handle_coalesced_mmio(struct kvm_cpu *cpu)
}
}
void kvm_cpu__reboot(void)
{
pthread_kill(kvm_cpus[0]->thread, SIGKVMEXIT);
}
int kvm_cpu__start(struct kvm_cpu *cpu)
{
sigset_t sigset;
kvm-run.c
+3 -3
View File
@@ -570,7 +570,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
vidmode = 0;
memset(real_cmdline, 0, sizeof(real_cmdline));
strcpy(real_cmdline, "notsc noapic noacpi pci=conf1");
strcpy(real_cmdline, "notsc noapic noacpi pci=conf1 reboot=k");
if (vnc || sdl) {
strcat(real_cmdline, " video=vesafb console=tty0");
} else
@@ -661,17 +661,17 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
kvm__init_ram(kvm);
kbd__init(kvm);
if (vnc || sdl)
fb = vesa__init(kvm);
if (vnc) {
kbd__init(kvm);
if (fb)
vnc__init(fb);
}
if (sdl) {
kbd__init(kvm);
if (fb)
sdl__init(fb);
}