AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-26 10:30:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

ARM: KVM: perform HYP initilization for hotplugged CPUs

Browse Source 
Now that we have the necessary infrastructure to boot a hotplugged CPU
at any point in time, wire a CPU notifier that will perform the HYP
init for the incoming CPU.

Note that this depends on the platform code and/or firmware to boot the
incoming CPU with HYP mode enabled and return to the kernel by following
the normal boot path (HYP stub installed).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
This commit is contained in:
Marc Zyngier 2013-04-12 19:12:07 +01:00 committed by Christoffer Dall
parent 5a677ce044
commit d157f4a515
3 changed files with 63 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/include/asm/kvm_mmu.h
View File

@ -44,6 +44,7 @@
int create_hyp_mappings(void *from, void *to);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
void free_boot_hyp_pgd(void);
void free_hyp_pgds(void);
int kvm_alloc_stage2_pgd(struct kvm *kvm);

49
arch/arm/kvm/arm.c
View File

@ -16,6 +16,7 @@
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
@ -785,7 +786,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
}
static void cpu_init_hyp_mode(void *vector)
static void cpu_init_hyp_mode(void *dummy)
{
unsigned long long boot_pgd_ptr;
unsigned long long pgd_ptr;
@ -805,12 +806,28 @@ static void cpu_init_hyp_mode(void *vector)
__cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
}
static int hyp_init_cpu_notify(struct notifier_block *self,
unsigned long action, void *cpu)
{
switch (action) {
case CPU_STARTING:
case CPU_STARTING_FROZEN:
cpu_init_hyp_mode(NULL);
break;
}
return NOTIFY_OK;
}
static struct notifier_block hyp_init_cpu_nb = {
.notifier_call = hyp_init_cpu_notify,
};
/**
* Inits Hyp-mode on all online CPUs
*/
static int init_hyp_mode(void)
{
phys_addr_t init_phys_addr;
int cpu;
int err = 0;
@ -842,19 +859,6 @@ static int init_hyp_mode(void)
per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
}
/*
* Execute the init code on each CPU.
*
* Note: The stack is not mapped yet, so don't do anything else than
* initializing the hypervisor mode on each CPU using a local stack
* space for temporary storage.
*/
init_phys_addr = virt_to_phys(__kvm_hyp_init);
for_each_online_cpu(cpu) {
smp_call_function_single(cpu, cpu_init_hyp_mode,
(void *)(long)init_phys_addr, 1);
}
/*
* Map the Hyp-code called directly from the host
*/
@ -899,6 +903,11 @@ static int init_hyp_mode(void)
}
}
/*
* Execute the init code on each CPU.
*/
on_each_cpu(cpu_init_hyp_mode, NULL, 1);
/*
* Init HYP view of VGIC
*/
@ -917,6 +926,10 @@ static int init_hyp_mode(void)
if (err)
goto out_free_mappings;
#ifndef CONFIG_HOTPLUG_CPU
free_boot_hyp_pgd();
#endif
kvm_perf_init();
kvm_info("Hyp mode initialized successfully\n");
@ -955,6 +968,12 @@ int kvm_arch_init(void *opaque)
if (err)
goto out_err;
err = register_cpu_notifier(&hyp_init_cpu_nb);
if (err) {
kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
goto out_err;
}
kvm_coproc_table_init();
return 0;
out_err:

35
arch/arm/kvm/mmu.c
View File

@ -155,6 +155,31 @@ static void unmap_range(pgd_t *pgdp, unsigned long long start, u64 size)
}
}
/**
* free_boot_hyp_pgd - free HYP boot page tables
*
* Free the HYP boot page tables. The bounce page is also freed.
*/
void free_boot_hyp_pgd(void)
{
mutex_lock(&kvm_hyp_pgd_mutex);
if (boot_hyp_pgd) {
unmap_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(boot_hyp_pgd);
boot_hyp_pgd = NULL;
}
if (hyp_pgd)
unmap_range(hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(init_bounce_page);
init_bounce_page = NULL;
mutex_unlock(&kvm_hyp_pgd_mutex);
}
/**
* free_hyp_pgds - free Hyp-mode page tables
*
@ -169,13 +194,9 @@ void free_hyp_pgds(void)
{
unsigned long addr;
mutex_lock(&kvm_hyp_pgd_mutex);
free_boot_hyp_pgd();
if (boot_hyp_pgd) {
unmap_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(boot_hyp_pgd);
}
mutex_lock(&kvm_hyp_pgd_mutex);
if (hyp_pgd) {
for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
@ -183,9 +204,9 @@ void free_hyp_pgds(void)
for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
unmap_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
kfree(hyp_pgd);
hyp_pgd = NULL;
}
kfree(init_bounce_page);
mutex_unlock(&kvm_hyp_pgd_mutex);
}