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hv: initial host reset implementation

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- add the GUEST_FLAG_HIGHEST_SEVERITY flag to indicate that the guest has
  privilege to reboot the host system.

- this flag is statically assigned to guest(s) in vm_configurations.c in
  different scenarios.

- implement reset_host() function to reset the host. First try the ACPI
  reset register if available, then try the 0xcf9 PIO.

Tracked-On: #3145
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Zide Chen
2019-05-07 10:56:00 -07:00
committed by ACRN System Integration
parent 321e4f1300
commit 5a23f7b664
6 changed files with 67 additions and 3 deletions
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10
hypervisor/arch/x86/guest/vm.c
View File

@@ -111,6 +111,16 @@ bool is_rt_vm(const struct acrn_vm *vm)
return ((vm_config->guest_flags & GUEST_FLAG_RT) != 0U);
}
/**
* @pre vm != NULL && vm_config != NULL && vm->vmid < CONFIG_MAX_VM_NUM
*/
bool is_highest_severity_vm(const struct acrn_vm *vm)
{
struct acrn_vm_config *vm_config = get_vm_config(vm->vm_id);
return ((vm_config->guest_flags & GUEST_FLAG_HIGHEST_SEVERITY) != 0U);
}
/**
* @pre vm != NULL && vm_config != NULL && vm->vmid < CONFIG_MAX_VM_NUM
*/

51
hypervisor/arch/x86/guest/vm_reset.c
View File

@@ -78,6 +78,45 @@ void triple_fault_shutdown_vm(struct acrn_vm *vm)
}
}
static void reset_host(void)
{
struct acpi_generic_address *gas = &(host_reset_reg.reg);
/* TODO: gracefully shut down all guests before doing host reset. */
/*
* UEFI more likely sets the reset value as 0x6 (not 0xe) for 0xcf9 port.
* This asserts PLTRST# to reset devices on the platform, but not the
* SLP_S3#/4#/5# signals, which power down the systems. This might not be
* enough for us.
*/
if ((gas->space_id == SPACE_SYSTEM_IO) &&
(gas->bit_width == 8U) && (gas->bit_offset == 0U) &&
(gas->address != 0U) && (gas->address != 0xcf9U)) {
pio_write8(host_reset_reg.val, (uint16_t)host_reset_reg.reg.address);
}
/*
* Fall back
* making sure bit 2 (RST_CPU) is '0', when the reset command is issued.
*/
pio_write8(0x2U, 0xcf9U);
pio_write8(0xeU, 0xcf9U);
/*
* Fall back
* keyboard controller might cause the INIT# being asserted,
* and not power cycle the system.
*/
pio_write8(0xfeU, 0x64U);
pr_fatal("%s(): can't reset host.", __func__);
while (1) {
asm_pause();
}
}
/**
* @pre vcpu != NULL && vm != NULL
*/
@@ -108,7 +147,11 @@ static bool handle_common_reset_reg_write(struct acrn_vm *vm, bool reset)
{
bool ret = true;
if (is_postlaunched_vm(vm)) {
if (is_highest_severity_vm(vm)) {
if (reset) {
reset_host();
}
} else if (is_postlaunched_vm(vm)) {
/* re-inject to DM */
ret = false;
@@ -155,7 +198,11 @@ static bool handle_reset_reg_write(__unused struct acrn_vm *vm, uint16_t addr, s
{
if (bytes == 1U) {
if (val == host_reset_reg.val) {
/* ignore reset request */
if (is_highest_severity_vm(vm)) {
reset_host();
} else {
/* ignore reset request */
}
} else {
/*
* ACPI defines the reset value but doesn't specify the meaning of other values.