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s390/mm/fault: Handle guest-related program interrupts in KVM

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Any program interrupt that happens in the host during the execution of
a KVM guest will now short circuit the fault handler and return to KVM
immediately. Guest fault handling (including pfault) will happen
entirely inside KVM.

When sie64a() returns zero, current->thread.gmap_int_code will contain
the program interrupt number that caused the exit, or zero if the exit
was not caused by a host program interrupt.

KVM will now take care of handling all guest faults in vcpu_post_run().

Since gmap faults will not be visible by the rest of the kernel, remove
GMAP_FAULT, the linux fault handlers for secure execution faults, the
exception table entries for the sie instruction, the nop padding after
the sie instruction, and all other references to guest faults from the
s390 code.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Co-developed-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20241022120601.167009-6-imbrenda@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2024-10-22 14:05:55 +02:00 committed by Heiko Carstens
parent 473aaf52b9
commit 05066cafa9
8 changed files with 143 additions and 157 deletions
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3
arch/s390/include/asm/kvm_host.h
View File

@ -527,6 +527,9 @@ struct kvm_vcpu_stat {
#define PGM_REGION_FIRST_TRANS 0x39
#define PGM_REGION_SECOND_TRANS 0x3a
#define PGM_REGION_THIRD_TRANS 0x3b
#define PGM_SECURE_STORAGE_ACCESS 0x3d
#define PGM_NON_SECURE_STORAGE_ACCESS 0x3e
#define PGM_SECURE_STORAGE_VIOLATION 0x3f
#define PGM_MONITOR 0x40
#define PGM_PER 0x80
#define PGM_CRYPTO_OPERATION 0x119

5
arch/s390/include/asm/processor.h
View File

@ -39,6 +39,7 @@
#include <asm/runtime_instr.h>
#include <asm/irqflags.h>
#include <asm/alternative.h>
#include <asm/fault.h>
struct pcpu {
unsigned long ec_mask; /* bit mask for ec_xxx functions */
@ -187,10 +188,8 @@ struct thread_struct {
unsigned long hardirq_timer; /* task cputime in hardirq context */
unsigned long softirq_timer; /* task cputime in softirq context */
const sys_call_ptr_t *sys_call_table; /* system call table address */
unsigned long gmap_addr; /* address of last gmap fault. */
unsigned int gmap_write_flag; /* gmap fault write indication */
union teid gmap_teid; /* address and flags of last gmap fault */
unsigned int gmap_int_code; /* int code of last gmap fault */
unsigned int gmap_pfault; /* signal of a pending guest pfault */
int ufpu_flags; /* user fpu flags */
int kfpu_flags; /* kernel fpu flags */

24
arch/s390/kernel/entry.S
View File

@ -222,17 +222,6 @@ SYM_FUNC_START(__sie64a)
lctlg %c1,%c1,__LC_KERNEL_ASCE(%r14) # load primary asce
lg %r14,__LC_CURRENT(%r14)
mvi __TI_sie(%r14),0
# some program checks are suppressing. C code (e.g. do_protection_exception)
# will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There
# are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
# Other instructions between __sie64a and .Lsie_done should not cause program
# interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
.Lrewind_pad6:
nopr 7
.Lrewind_pad4:
nopr 7
.Lrewind_pad2:
nopr 7
SYM_INNER_LABEL(sie_exit, SYM_L_GLOBAL)
lg %r14,__SF_SIE_SAVEAREA(%r15) # load guest register save area
stmg %r0,%r13,0(%r14) # save guest gprs 0-13
@ -244,15 +233,6 @@ SYM_INNER_LABEL(sie_exit, SYM_L_GLOBAL)
lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
lg %r2,__SF_SIE_REASON(%r15) # return exit reason code
BR_EX %r14
.Lsie_fault:
lghi %r14,-EFAULT
stg %r14,__SF_SIE_REASON(%r15) # set exit reason code
j sie_exit
EX_TABLE(.Lrewind_pad6,.Lsie_fault)
EX_TABLE(.Lrewind_pad4,.Lsie_fault)
EX_TABLE(.Lrewind_pad2,.Lsie_fault)
EX_TABLE(sie_exit,.Lsie_fault)
SYM_FUNC_END(__sie64a)
EXPORT_SYMBOL(__sie64a)
EXPORT_SYMBOL(sie_exit)
@ -329,7 +309,6 @@ SYM_CODE_START(pgm_check_handler)
BPOFF
lmg %r8,%r9,__LC_PGM_OLD_PSW(%r13)
xgr %r10,%r10
xgr %r12,%r12
tmhh %r8,0x0001 # coming from user space?
jno .Lpgm_skip_asce
lctlg %c1,%c1,__LC_KERNEL_ASCE(%r13)
@ -341,7 +320,6 @@ SYM_CODE_START(pgm_check_handler)
jz 1f
BPENTER __SF_SIE_FLAGS(%r15),_TIF_ISOLATE_BP_GUEST
SIEEXIT __SF_SIE_CONTROL(%r15),%r13
lg %r12,__SF_SIE_GUEST_ASCE(%r15)
lghi %r10,_PIF_GUEST_FAULT
#endif
1: tmhh %r8,0x4000 # PER bit set in old PSW ?
@ -355,7 +333,6 @@ SYM_CODE_START(pgm_check_handler)
3: lg %r15,__LC_KERNEL_STACK(%r13)
4: la %r11,STACK_FRAME_OVERHEAD(%r15)
stg %r10,__PT_FLAGS(%r11)
stg %r12,__PT_CR1(%r11)
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
stmg %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA(%r13)
@ -369,6 +346,7 @@ SYM_CODE_START(pgm_check_handler)
xgr %r5,%r5
xgr %r6,%r6
xgr %r7,%r7
xgr %r12,%r12
lgr %r2,%r11
brasl %r14,__do_pgm_check
tmhh %r8,0x0001 # returning to user space?

24
arch/s390/kernel/traps.c
View File

@ -31,6 +31,7 @@
#include <asm/asm-extable.h>
#include <asm/vtime.h>
#include <asm/fpu.h>
#include <asm/fault.h>
#include "entry.h"
static inline void __user *get_trap_ip(struct pt_regs *regs)
@ -317,9 +318,24 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
struct lowcore *lc = get_lowcore();
irqentry_state_t state;
unsigned int trapnr;
union teid teid;
teid.val = lc->trans_exc_code;
regs->int_code = lc->pgm_int_code;
regs->int_parm_long = lc->trans_exc_code;
regs->int_parm_long = teid.val;
/*
* In case of a guest fault, short-circuit the fault handler and return.
* This way the sie64a() function will return 0; fault address and
* other relevant bits are saved in current->thread.gmap_teid, and
* the fault number in current->thread.gmap_int_code. KVM will be
* able to use this information to handle the fault.
*/
if (test_pt_regs_flag(regs, PIF_GUEST_FAULT)) {
current->thread.gmap_teid.val = regs->int_parm_long;
current->thread.gmap_int_code = regs->int_code & 0xffff;
return;
}
state = irqentry_enter(regs);
@ -408,8 +424,8 @@ static void (*pgm_check_table[128])(struct pt_regs *regs) = {
[0x3b] = do_dat_exception,
[0x3c] = default_trap_handler,
[0x3d] = do_secure_storage_access,
[0x3e] = do_non_secure_storage_access,
[0x3f] = do_secure_storage_violation,
[0x3e] = default_trap_handler,
[0x3f] = default_trap_handler,
[0x40] = monitor_event_exception,
[0x41 ... 0x7f] = default_trap_handler,
};
@ -420,5 +436,3 @@ static void (*pgm_check_table[128])(struct pt_regs *regs) = {
__stringify(default_trap_handler))
COND_TRAP(do_secure_storage_access);
COND_TRAP(do_non_secure_storage_access);
COND_TRAP(do_secure_storage_violation);

125
arch/s390/kvm/kvm-s390.c
View File

@ -4646,12 +4646,11 @@ static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
if (!vcpu->arch.gmap->pfault_enabled)
return false;
hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
hva += current->thread.gmap_addr & ~PAGE_MASK;
hva = gfn_to_hva(vcpu->kvm, current->thread.gmap_teid.addr);
if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
return false;
return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
return kvm_setup_async_pf(vcpu, current->thread.gmap_teid.addr * PAGE_SIZE, hva, &arch);
}
static int vcpu_pre_run(struct kvm_vcpu *vcpu)
@ -4689,6 +4688,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)
clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
vcpu->arch.sie_block->icptcode = 0;
current->thread.gmap_int_code = 0;
cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
trace_kvm_s390_sie_enter(vcpu, cpuflags);
@ -4696,7 +4696,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)
return 0;
}
static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
static int vcpu_post_run_addressing_exception(struct kvm_vcpu *vcpu)
{
struct kvm_s390_pgm_info pgm_info = {
.code = PGM_ADDRESSING,
@ -4732,10 +4732,106 @@ static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
}
static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu)
{
unsigned long gaddr;
unsigned int flags;
int rc = 0;
gaddr = current->thread.gmap_teid.addr * PAGE_SIZE;
if (kvm_s390_cur_gmap_fault_is_write())
flags = FAULT_FLAG_WRITE;
switch (current->thread.gmap_int_code) {
case 0:
vcpu->stat.exit_null++;
break;
case PGM_NON_SECURE_STORAGE_ACCESS:
KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm,
"Unexpected program interrupt 0x%x, TEID 0x%016lx",
current->thread.gmap_int_code, current->thread.gmap_teid.val);
/*
* This is normal operation; a page belonging to a protected
* guest has not been imported yet. Try to import the page into
* the protected guest.
*/
if (gmap_convert_to_secure(vcpu->arch.gmap, gaddr) == -EINVAL)
send_sig(SIGSEGV, current, 0);
break;
case PGM_SECURE_STORAGE_ACCESS:
case PGM_SECURE_STORAGE_VIOLATION:
KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm,
"Unexpected program interrupt 0x%x, TEID 0x%016lx",
current->thread.gmap_int_code, current->thread.gmap_teid.val);
/*
* This can happen after a reboot with asynchronous teardown;
* the new guest (normal or protected) will run on top of the
* previous protected guest. The old pages need to be destroyed
* so the new guest can use them.
*/
if (gmap_destroy_page(vcpu->arch.gmap, gaddr)) {
/*
* Either KVM messed up the secure guest mapping or the
* same page is mapped into multiple secure guests.
*
* This exception is only triggered when a guest 2 is
* running and can therefore never occur in kernel
* context.
*/
pr_warn_ratelimited("Secure storage violation (%x) in task: %s, pid %d\n",
current->thread.gmap_int_code, current->comm,
current->pid);
send_sig(SIGSEGV, current, 0);
}
break;
case PGM_PROTECTION:
case PGM_SEGMENT_TRANSLATION:
case PGM_PAGE_TRANSLATION:
case PGM_ASCE_TYPE:
case PGM_REGION_FIRST_TRANS:
case PGM_REGION_SECOND_TRANS:
case PGM_REGION_THIRD_TRANS:
KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm,
"Unexpected program interrupt 0x%x, TEID 0x%016lx",
current->thread.gmap_int_code, current->thread.gmap_teid.val);
if (vcpu->arch.gmap->pfault_enabled) {
rc = gmap_fault(vcpu->arch.gmap, gaddr, flags | FAULT_FLAG_RETRY_NOWAIT);
if (rc == -EFAULT)
return vcpu_post_run_addressing_exception(vcpu);
if (rc == -EAGAIN) {
trace_kvm_s390_major_guest_pfault(vcpu);
if (kvm_arch_setup_async_pf(vcpu))
return 0;
vcpu->stat.pfault_sync++;
} else {
return rc;
}
}
rc = gmap_fault(vcpu->arch.gmap, gaddr, flags);
if (rc == -EFAULT) {
if (kvm_is_ucontrol(vcpu->kvm)) {
vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
vcpu->run->s390_ucontrol.trans_exc_code = gaddr;
vcpu->run->s390_ucontrol.pgm_code = 0x10;
return -EREMOTE;
}
return vcpu_post_run_addressing_exception(vcpu);
}
break;
default:
KVM_BUG(1, vcpu->kvm, "Unexpected program interrupt 0x%x, TEID 0x%016lx",
current->thread.gmap_int_code, current->thread.gmap_teid.val);
send_sig(SIGSEGV, current, 0);
break;
}
return rc;
}
static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
struct mcck_volatile_info *mcck_info;
struct sie_page *sie_page;
int rc;
VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
vcpu->arch.sie_block->icptcode);
@ -4757,7 +4853,7 @@ static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
}
if (vcpu->arch.sie_block->icptcode > 0) {
int rc = kvm_handle_sie_intercept(vcpu);
rc = kvm_handle_sie_intercept(vcpu);
if (rc != -EOPNOTSUPP)
return rc;
@ -4766,24 +4862,9 @@ static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
return -EREMOTE;
} else if (exit_reason != -EFAULT) {
vcpu->stat.exit_null++;
return 0;
} else if (kvm_is_ucontrol(vcpu->kvm)) {
vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
vcpu->run->s390_ucontrol.trans_exc_code =
current->thread.gmap_addr;
vcpu->run->s390_ucontrol.pgm_code = 0x10;
return -EREMOTE;
} else if (current->thread.gmap_pfault) {
trace_kvm_s390_major_guest_pfault(vcpu);
current->thread.gmap_pfault = 0;
if (kvm_arch_setup_async_pf(vcpu))
return 0;
vcpu->stat.pfault_sync++;
return gmap_fault(vcpu->arch.gmap, current->thread.gmap_addr, FAULT_FLAG_WRITE);
}
return vcpu_post_run_fault_in_sie(vcpu);
return vcpu_post_run_handle_fault(vcpu);
}
#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)

7
arch/s390/kvm/kvm-s390.h
View File

@ -528,6 +528,13 @@ static inline int kvm_s390_use_sca_entries(void)
void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
struct mcck_volatile_info *mcck_info);
static inline bool kvm_s390_cur_gmap_fault_is_write(void)
{
if (current->thread.gmap_int_code == PGM_PROTECTION)
return true;
return test_facility(75) && (current->thread.gmap_teid.fsi == TEID_FSI_STORE);
}
/**
* kvm_s390_vcpu_crypto_reset_all
*

13
arch/s390/kvm/vsie.c
View File

@ -925,16 +925,16 @@ static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
if (current->thread.gmap_int_code == PGM_PROTECTION)
/* we can directly forward all protection exceptions */
return inject_fault(vcpu, PGM_PROTECTION,
current->thread.gmap_addr, 1);
current->thread.gmap_teid.addr * PAGE_SIZE, 1);
rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
current->thread.gmap_addr, NULL);
current->thread.gmap_teid.addr * PAGE_SIZE, NULL);
if (rc > 0) {
rc = inject_fault(vcpu, rc,
current->thread.gmap_addr,
current->thread.gmap_write_flag);
current->thread.gmap_teid.addr * PAGE_SIZE,
kvm_s390_cur_gmap_fault_is_write());
if (rc >= 0)
vsie_page->fault_addr = current->thread.gmap_addr;
vsie_page->fault_addr = current->thread.gmap_teid.addr * PAGE_SIZE;
}
return rc;
}
@ -1148,6 +1148,7 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
* also kick the vSIE.
*/
vcpu->arch.sie_block->prog0c |= PROG_IN_SIE;
current->thread.gmap_int_code = 0;
barrier();
if (!kvm_s390_vcpu_sie_inhibited(vcpu))
rc = sie64a(scb_s, vcpu->run->s.regs.gprs, gmap_get_enabled()->asce);
@ -1172,7 +1173,7 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
if (rc > 0)
rc = 0; /* we could still have an icpt */
else if (rc == -EFAULT)
else if (current->thread.gmap_int_code)
return handle_fault(vcpu, vsie_page);
switch (scb_s->icptcode) {

99
arch/s390/mm/fault.c
View File

@ -49,7 +49,6 @@
enum fault_type {
KERNEL_FAULT,
USER_FAULT,
GMAP_FAULT,
};
static DEFINE_STATIC_KEY_FALSE(have_store_indication);
@ -72,10 +71,6 @@ static enum fault_type get_fault_type(struct pt_regs *regs)
if (likely(teid.as == PSW_BITS_AS_PRIMARY)) {
if (user_mode(regs))
return USER_FAULT;
if (!IS_ENABLED(CONFIG_PGSTE))
return KERNEL_FAULT;
if (test_pt_regs_flag(regs, PIF_GUEST_FAULT))
return GMAP_FAULT;
return KERNEL_FAULT;
}
if (teid.as == PSW_BITS_AS_SECONDARY)
@ -184,10 +179,6 @@ static void dump_fault_info(struct pt_regs *regs)
asce = get_lowcore()->user_asce.val;
pr_cont("user ");
break;
case GMAP_FAULT:
asce = regs->cr1;
pr_cont("gmap ");
break;
case KERNEL_FAULT:
asce = get_lowcore()->kernel_asce.val;
pr_cont("kernel ");
@ -285,7 +276,6 @@ static void do_exception(struct pt_regs *regs, int access)
struct mm_struct *mm;
enum fault_type type;
unsigned int flags;
struct gmap *gmap;
vm_fault_t fault;
bool is_write;
@ -304,7 +294,6 @@ static void do_exception(struct pt_regs *regs, int access)
case KERNEL_FAULT:
return handle_fault_error_nolock(regs, 0);
case USER_FAULT:
case GMAP_FAULT:
if (faulthandler_disabled() || !mm)
return handle_fault_error_nolock(regs, 0);
break;
@ -348,18 +337,6 @@ static void do_exception(struct pt_regs *regs, int access)
}
lock_mmap:
mmap_read_lock(mm);
gmap = NULL;
if (IS_ENABLED(CONFIG_PGSTE) && type == GMAP_FAULT) {
gmap = (struct gmap *)get_lowcore()->gmap;
current->thread.gmap_addr = address;
current->thread.gmap_write_flag = !!(flags & FAULT_FLAG_WRITE);
current->thread.gmap_int_code = regs->int_code & 0xffff;
address = __gmap_translate(gmap, address);
if (address == -EFAULT)
return handle_fault_error(regs, SEGV_MAPERR);
if (gmap->pfault_enabled)
flags |= FAULT_FLAG_RETRY_NOWAIT;
}
retry:
vma = find_vma(mm, address);
if (!vma)
@ -375,50 +352,22 @@ retry:
return handle_fault_error(regs, SEGV_ACCERR);
fault = handle_mm_fault(vma, address, flags, regs);
if (fault_signal_pending(fault, regs)) {
if (flags & FAULT_FLAG_RETRY_NOWAIT)
mmap_read_unlock(mm);
if (!user_mode(regs))
handle_fault_error_nolock(regs, 0);
return;
}
/* The fault is fully completed (including releasing mmap lock) */
if (fault & VM_FAULT_COMPLETED) {
if (gmap) {
mmap_read_lock(mm);
goto gmap;
}
if (fault & VM_FAULT_COMPLETED)
return;
}
if (unlikely(fault & VM_FAULT_ERROR)) {
mmap_read_unlock(mm);
goto error;
}
if (fault & VM_FAULT_RETRY) {
if (IS_ENABLED(CONFIG_PGSTE) && gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) {
/*
* FAULT_FLAG_RETRY_NOWAIT has been set,
* mmap_lock has not been released
*/
current->thread.gmap_pfault = 1;
return handle_fault_error(regs, 0);
}
flags &= ~FAULT_FLAG_RETRY_NOWAIT;
flags |= FAULT_FLAG_TRIED;
mmap_read_lock(mm);
goto retry;
}
gmap:
if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
address = __gmap_link(gmap, current->thread.gmap_addr,
address);
if (address == -EFAULT)
return handle_fault_error(regs, SEGV_MAPERR);
if (address == -ENOMEM) {
fault = VM_FAULT_OOM;
mmap_read_unlock(mm);
goto error;
}
}
mmap_read_unlock(mm);
return;
error:
@ -494,7 +443,6 @@ void do_secure_storage_access(struct pt_regs *regs)
struct folio_walk fw;
struct mm_struct *mm;
struct folio *folio;
struct gmap *gmap;
int rc;
/*
@ -520,15 +468,6 @@ void do_secure_storage_access(struct pt_regs *regs)
panic("Unexpected PGM 0x3d with TEID bit 61=0");
}
switch (get_fault_type(regs)) {
case GMAP_FAULT:
mm = current->mm;
gmap = (struct gmap *)get_lowcore()->gmap;
mmap_read_lock(mm);
addr = __gmap_translate(gmap, addr);
mmap_read_unlock(mm);
if (IS_ERR_VALUE(addr))
return handle_fault_error_nolock(regs, SEGV_MAPERR);
fallthrough;
case USER_FAULT:
mm = current->mm;
mmap_read_lock(mm);
@ -564,40 +503,4 @@ void do_secure_storage_access(struct pt_regs *regs)
}
NOKPROBE_SYMBOL(do_secure_storage_access);
void do_non_secure_storage_access(struct pt_regs *regs)
{
struct gmap *gmap = (struct gmap *)get_lowcore()->gmap;
unsigned long gaddr = get_fault_address(regs);
if (WARN_ON_ONCE(get_fault_type(regs) != GMAP_FAULT))
return handle_fault_error_nolock(regs, SEGV_MAPERR);
if (gmap_convert_to_secure(gmap, gaddr) == -EINVAL)
send_sig(SIGSEGV, current, 0);
}
NOKPROBE_SYMBOL(do_non_secure_storage_access);
void do_secure_storage_violation(struct pt_regs *regs)
{
struct gmap *gmap = (struct gmap *)get_lowcore()->gmap;
unsigned long gaddr = get_fault_address(regs);
/*
* If the VM has been rebooted, its address space might still contain
* secure pages from the previous boot.
* Clear the page so it can be reused.
*/
if (!gmap_destroy_page(gmap, gaddr))
return;
/*
* Either KVM messed up the secure guest mapping or the same
* page is mapped into multiple secure guests.
*
* This exception is only triggered when a guest 2 is running
* and can therefore never occur in kernel context.
*/
pr_warn_ratelimited("Secure storage violation in task: %s, pid %d\n",
current->comm, current->pid);
send_sig(SIGSEGV, current, 0);
}
#endif /* CONFIG_PGSTE */