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Two fixes for s390 

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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull s390 kvm fixes from Paolo Bonzini:
 "Two fixes for s390"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: s390: fix pfmf non-quiescing control handling
  KVM: s390: move kvm_guest_enter,exit closer to sie
This commit is contained in:
Linus Torvalds 2013-08-11 12:11:33 -07:00
parent 9e6bdaaaa5 e769ece3b1
commit 30b229bdd8
2 changed files with 16 additions and 9 deletions
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21
arch/s390/kvm/kvm-s390.c
View File

@ -702,14 +702,25 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
return rc; return rc;
vcpu->arch.sie_block->icptcode = 0; vcpu->arch.sie_block->icptcode = 0;
preempt_disable();
kvm_guest_enter();
preempt_enable();
VCPU_EVENT(vcpu, 6, "entering sie flags %x", VCPU_EVENT(vcpu, 6, "entering sie flags %x",
atomic_read(&vcpu->arch.sie_block->cpuflags)); atomic_read(&vcpu->arch.sie_block->cpuflags));
trace_kvm_s390_sie_enter(vcpu, trace_kvm_s390_sie_enter(vcpu,
atomic_read(&vcpu->arch.sie_block->cpuflags)); atomic_read(&vcpu->arch.sie_block->cpuflags));
/*
* As PF_VCPU will be used in fault handler, between guest_enter
* and guest_exit should be no uaccess.
*/
preempt_disable();
kvm_guest_enter();
preempt_enable();
rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs); rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs);
kvm_guest_exit();
VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
vcpu->arch.sie_block->icptcode);
trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
if (rc > 0) if (rc > 0)
rc = 0; rc = 0;
if (rc < 0) { if (rc < 0) {
@ -721,10 +732,6 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
} }
} }
VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
vcpu->arch.sie_block->icptcode);
trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
kvm_guest_exit();
memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16); memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
return rc; return rc;

4
arch/s390/kvm/priv.c
View File

@ -16,6 +16,7 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/compat.h> #include <linux/compat.h>
#include <asm/asm-offsets.h> #include <asm/asm-offsets.h>
#include <asm/facility.h>
#include <asm/current.h> #include <asm/current.h>
#include <asm/debug.h> #include <asm/debug.h>
#include <asm/ebcdic.h> #include <asm/ebcdic.h>
@ -532,8 +533,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
/* Only provide non-quiescing support if the host supports it */ /* Only provide non-quiescing support if the host supports it */
if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
S390_lowcore.stfl_fac_list & 0x00020000)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
/* No support for conditional-SSKE */ /* No support for conditional-SSKE */