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Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c270
1 files changed, 109 insertions, 161 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 0ef9894606e..6bbd7b5a0bb 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -14,6 +14,8 @@
#include <linux/kvm.h>
#include <linux/gfp.h>
#include <linux/errno.h>
+#include <linux/compat.h>
+#include <asm/asm-offsets.h>
#include <asm/current.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
@@ -35,31 +37,24 @@ static int handle_set_prefix(struct kvm_vcpu *vcpu)
operand2 = kvm_s390_get_base_disp_s(vcpu);
/* must be word boundary */
- if (operand2 & 3) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
+ if (operand2 & 3)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
/* get the value */
- if (get_guest_u32(vcpu, operand2, &address)) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
+ if (get_guest(vcpu, address, (u32 __user *) operand2))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
address = address & 0x7fffe000u;
/* make sure that the new value is valid memory */
if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
- (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
+ (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
kvm_s390_set_prefix(vcpu, address);
VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
trace_kvm_s390_handle_prefix(vcpu, 1, address);
-out:
return 0;
}
@@ -73,49 +68,37 @@ static int handle_store_prefix(struct kvm_vcpu *vcpu)
operand2 = kvm_s390_get_base_disp_s(vcpu);
/* must be word boundary */
- if (operand2 & 3) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
+ if (operand2 & 3)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
address = vcpu->arch.sie_block->prefix;
address = address & 0x7fffe000u;
/* get the value */
- if (put_guest_u32(vcpu, operand2, address)) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
+ if (put_guest(vcpu, address, (u32 __user *)operand2))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
trace_kvm_s390_handle_prefix(vcpu, 0, address);
-out:
return 0;
}
static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
{
u64 useraddr;
- int rc;
vcpu->stat.instruction_stap++;
useraddr = kvm_s390_get_base_disp_s(vcpu);
- if (useraddr & 1) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
+ if (useraddr & 1)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
- if (rc == -EFAULT) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
+ if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
trace_kvm_s390_handle_stap(vcpu, useraddr);
-out:
return 0;
}
@@ -129,36 +112,38 @@ static int handle_skey(struct kvm_vcpu *vcpu)
static int handle_tpi(struct kvm_vcpu *vcpu)
{
- u64 addr;
struct kvm_s390_interrupt_info *inti;
+ u64 addr;
int cc;
addr = kvm_s390_get_base_disp_s(vcpu);
-
+ if (addr & 3)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ cc = 0;
inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
- if (inti) {
- if (addr) {
- /*
- * Store the two-word I/O interruption code into the
- * provided area.
- */
- put_guest_u16(vcpu, addr, inti->io.subchannel_id);
- put_guest_u16(vcpu, addr + 2, inti->io.subchannel_nr);
- put_guest_u32(vcpu, addr + 4, inti->io.io_int_parm);
- } else {
- /*
- * Store the three-word I/O interruption code into
- * the appropriate lowcore area.
- */
- put_guest_u16(vcpu, 184, inti->io.subchannel_id);
- put_guest_u16(vcpu, 186, inti->io.subchannel_nr);
- put_guest_u32(vcpu, 188, inti->io.io_int_parm);
- put_guest_u32(vcpu, 192, inti->io.io_int_word);
- }
- cc = 1;
- } else
- cc = 0;
+ if (!inti)
+ goto no_interrupt;
+ cc = 1;
+ if (addr) {
+ /*
+ * Store the two-word I/O interruption code into the
+ * provided area.
+ */
+ put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) addr);
+ put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) (addr + 2));
+ put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) (addr + 4));
+ } else {
+ /*
+ * Store the three-word I/O interruption code into
+ * the appropriate lowcore area.
+ */
+ put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
+ put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
+ put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
+ put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
+ }
kfree(inti);
+no_interrupt:
/* Set condition code and we're done. */
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44;
@@ -230,13 +215,10 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
&facility_list, sizeof(facility_list));
- if (rc == -EFAULT)
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- else {
- VCPU_EVENT(vcpu, 5, "store facility list value %x",
- facility_list);
- trace_kvm_s390_handle_stfl(vcpu, facility_list);
- }
+ if (rc)
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list);
+ trace_kvm_s390_handle_stfl(vcpu, facility_list);
return 0;
}
@@ -249,112 +231,80 @@ static void handle_new_psw(struct kvm_vcpu *vcpu)
#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
-#define PSW_ADDR_24 0x00000000000fffffUL
+#define PSW_ADDR_24 0x0000000000ffffffUL
#define PSW_ADDR_31 0x000000007fffffffUL
+static int is_valid_psw(psw_t *psw) {
+ if (psw->mask & PSW_MASK_UNASSIGNED)
+ return 0;
+ if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
+ if (psw->addr & ~PSW_ADDR_31)
+ return 0;
+ }
+ if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
+ return 0;
+ if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
+ return 0;
+ return 1;
+}
+
int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
{
- u64 addr;
+ psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
psw_compat_t new_psw;
+ u64 addr;
- if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ if (gpsw->mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu,
PGM_PRIVILEGED_OPERATION);
-
addr = kvm_s390_get_base_disp_s(vcpu);
-
- if (addr & 7) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
-
- if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
-
- if (!(new_psw.mask & PSW32_MASK_BASE)) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
-
- vcpu->arch.sie_block->gpsw.mask =
- (new_psw.mask & ~PSW32_MASK_BASE) << 32;
- vcpu->arch.sie_block->gpsw.addr = new_psw.addr;
-
- if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_UNASSIGNED) ||
- (!(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) &&
- (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_24)) ||
- ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
- PSW_MASK_EA)) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
-
+ if (addr & 7)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ if (!(new_psw.mask & PSW32_MASK_BASE))
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
+ gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
+ gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
+ if (!is_valid_psw(gpsw))
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
handle_new_psw(vcpu);
-out:
return 0;
}
static int handle_lpswe(struct kvm_vcpu *vcpu)
{
- u64 addr;
psw_t new_psw;
+ u64 addr;
addr = kvm_s390_get_base_disp_s(vcpu);
-
- if (addr & 7) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
-
- if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
-
- vcpu->arch.sie_block->gpsw.mask = new_psw.mask;
- vcpu->arch.sie_block->gpsw.addr = new_psw.addr;
-
- if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_UNASSIGNED) ||
- (((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
- PSW_MASK_BA) &&
- (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_31)) ||
- (!(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) &&
- (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_24)) ||
- ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
- PSW_MASK_EA)) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
-
+ if (addr & 7)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ vcpu->arch.sie_block->gpsw = new_psw;
+ if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
handle_new_psw(vcpu);
-out:
return 0;
}
static int handle_stidp(struct kvm_vcpu *vcpu)
{
u64 operand2;
- int rc;
vcpu->stat.instruction_stidp++;
operand2 = kvm_s390_get_base_disp_s(vcpu);
- if (operand2 & 7) {
- kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- goto out;
- }
+ if (operand2 & 7)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
- if (rc == -EFAULT) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out;
- }
+ if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
-out:
return 0;
}
@@ -394,8 +344,9 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
+ unsigned long mem = 0;
u64 operand2;
- unsigned long mem;
+ int rc = 0;
vcpu->stat.instruction_stsi++;
VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
@@ -414,37 +365,37 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
case 2:
mem = get_zeroed_page(GFP_KERNEL);
if (!mem)
- goto out_fail;
+ goto out_no_data;
if (stsi((void *) mem, fc, sel1, sel2))
- goto out_mem;
+ goto out_no_data;
break;
case 3:
if (sel1 != 2 || sel2 != 2)
- goto out_fail;
+ goto out_no_data;
mem = get_zeroed_page(GFP_KERNEL);
if (!mem)
- goto out_fail;
+ goto out_no_data;
handle_stsi_3_2_2(vcpu, (void *) mem);
break;
default:
- goto out_fail;
+ goto out_no_data;
}
if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
- kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- goto out_mem;
+ rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out_exception;
}
trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
free_page(mem);
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
vcpu->run->s.regs.gprs[0] = 0;
return 0;
-out_mem:
- free_page(mem);
-out_fail:
+out_no_data:
/* condition code 3 */
vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
- return 0;
+out_exception:
+ free_page(mem);
+ return rc;
}
static const intercept_handler_t b2_handlers[256] = {
@@ -575,20 +526,13 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
return -EOPNOTSUPP;
-
- /* we must resolve the address without holding the mmap semaphore.
- * This is ok since the userspace hypervisor is not supposed to change
- * the mapping while the guest queries the memory. Otherwise the guest
- * might crash or get wrong info anyway. */
- user_address = (unsigned long) __guestaddr_to_user(vcpu, address1);
-
down_read(&current->mm->mmap_sem);
+ user_address = __gmap_translate(address1, vcpu->arch.gmap);
+ if (IS_ERR_VALUE(user_address))
+ goto out_inject;
vma = find_vma(current->mm, user_address);
- if (!vma) {
- up_read(&current->mm->mmap_sem);
- return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- }
-
+ if (!vma)
+ goto out_inject;
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
@@ -597,6 +541,10 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
up_read(&current->mm->mmap_sem);
return 0;
+
+out_inject:
+ up_read(&current->mm->mmap_sem);
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
}
int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-20 17:32:53 +0000