KVM: s390: Add support for machine checks.
Add support for injecting machine checks (only repressible
conditions for now).
This is a bit more involved than I/O interrupts, for these reasons:
- Machine checks come in both floating and cpu varieties.
- We don't have a bit for machine checks enabling, but have to use
a roundabout approach with trapping PSW changing instructions and
watching for opened machine checks.
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index d715842..d3cbcd3 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -18,6 +18,8 @@
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
+#include <asm/ptrace.h>
+#include <asm/compat.h>
#include "gaccess.h"
#include "kvm-s390.h"
#include "trace.h"
@@ -166,6 +168,99 @@
return 0;
}
+static void handle_new_psw(struct kvm_vcpu *vcpu)
+{
+ /* Check whether the new psw is enabled for machine checks. */
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
+ kvm_s390_deliver_pending_machine_checks(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_31 0x000000007fffffffUL
+
+int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
+{
+ u64 addr;
+ psw_compat_t new_psw;
+
+ if (vcpu->arch.sie_block->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;
+ }
+
+ handle_new_psw(vcpu);
+out:
+ return 0;
+}
+
+static int handle_lpswe(struct kvm_vcpu *vcpu)
+{
+ u64 addr;
+ psw_t new_psw;
+
+ 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;
+ }
+
+ handle_new_psw(vcpu);
+out:
+ return 0;
+}
+
static int handle_stidp(struct kvm_vcpu *vcpu)
{
u64 operand2;
@@ -292,6 +387,7 @@
[0x5f] = handle_chsc,
[0x7d] = handle_stsi,
[0xb1] = handle_stfl,
+ [0xb2] = handle_lpswe,
};
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
@@ -316,6 +412,45 @@
return -EOPNOTSUPP;
}
+static int handle_epsw(struct kvm_vcpu *vcpu)
+{
+ int reg1, reg2;
+
+ reg1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 24;
+ reg2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
+
+ /* This basically extracts the mask half of the psw. */
+ vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000;
+ vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
+ if (reg2) {
+ vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000;
+ vcpu->run->s.regs.gprs[reg2] |=
+ vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff;
+ }
+ return 0;
+}
+
+static const intercept_handler_t b9_handlers[256] = {
+ [0x8d] = handle_epsw,
+};
+
+int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
+{
+ intercept_handler_t handler;
+
+ /* This is handled just as for the B2 instructions. */
+ handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
+ if (handler) {
+ if ((handler != handle_epsw) &&
+ (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE))
+ return kvm_s390_inject_program_int(vcpu,
+ PGM_PRIVILEGED_OPERATION);
+ else
+ return handler(vcpu);
+ }
+ return -EOPNOTSUPP;
+}
+
static int handle_tprot(struct kvm_vcpu *vcpu)
{
u64 address1, address2;