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KVM: s390: make exit_sie_sync more robust

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exit_sie_sync is used to kick CPUs out of SIE and prevent reentering at
any point in time. This is used to reload the prefix pages and to
set the IBS stuff in a way that guarantees that after this function
returns we are no longer in SIE. All current users trigger KVM requests.

The request must be set before we block the CPUs to avoid races. Let's
make this implicit by adding the request into a new function
kvm_s390_sync_requests that replaces exit_sie_sync and split out
s390_vcpu_block and s390_vcpu_unblock, that can be used to keep
CPUs out of SIE independent of requests.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2015-04-09 13:49:04 +02:00
parent 53df84f8de
commit 8e23654687
4 changed files with 22 additions and 13 deletions
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3
arch/s390/include/asm/kvm_host.h
View File

@ -96,7 +96,8 @@ struct kvm_s390_sie_block {
#define PROG_IN_SIE (1<<0)
__u32 prog0c; /* 0x000c */
__u8 reserved10[16]; /* 0x0010 */
#define PROG_BLOCK_SIE 0x00000001
#define PROG_BLOCK_SIE (1<<0)
#define PROG_REQUEST (1<<1)
atomic_t prog20; /* 0x0020 */
__u8 reserved24[4]; /* 0x0024 */
__u64 cputm; /* 0x0028 */

2
arch/s390/kernel/entry.S
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@ -1005,7 +1005,7 @@ ENTRY(sie64a)
.Lsie_gmap:
lg %r14,__SF_EMPTY(%r15) # get control block pointer
oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
tm __SIE_PROG20+3(%r14),1 # last exit...
tm __SIE_PROG20+3(%r14),3 # last exit...
jnz .Lsie_done
LPP __SF_EMPTY(%r15) # set guest id
sie 0(%r14)

28
arch/s390/kvm/kvm-s390.c
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@ -1424,6 +1424,16 @@ void s390_vcpu_unblock(struct kvm_vcpu *vcpu)
atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
}
static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
atomic_set_mask(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
}
static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
atomic_clear_mask(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
}
/*
* Kick a guest cpu out of SIE and wait until SIE is not running.
* If the CPU is not running (e.g. waiting as idle) the function will
@ -1435,10 +1445,11 @@ void exit_sie(struct kvm_vcpu *vcpu)
cpu_relax();
}
/* Kick a guest cpu out of SIE and prevent SIE-reentry */
void exit_sie_sync(struct kvm_vcpu *vcpu)
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
{
s390_vcpu_block(vcpu);
kvm_make_request(req, vcpu);
kvm_s390_vcpu_request(vcpu);
exit_sie(vcpu);
}
@ -1452,8 +1463,7 @@ static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
/* match against both prefix pages */
if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
exit_sie_sync(vcpu);
kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
}
}
}
@ -1728,7 +1738,7 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
if (!vcpu->requests)
return 0;
retry:
s390_vcpu_unblock(vcpu);
kvm_s390_vcpu_request_handled(vcpu);
/*
* We use MMU_RELOAD just to re-arm the ipte notifier for the
* guest prefix page. gmap_ipte_notify will wait on the ptl lock.
@ -2213,8 +2223,7 @@ int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr)
static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
kvm_make_request(KVM_REQ_DISABLE_IBS, vcpu);
exit_sie_sync(vcpu);
kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
}
static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
@ -2230,8 +2239,7 @@ static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
kvm_make_request(KVM_REQ_ENABLE_IBS, vcpu);
exit_sie_sync(vcpu);
kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
}
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)

2
arch/s390/kvm/kvm-s390.h
View File

@ -214,7 +214,7 @@ void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
void s390_vcpu_block(struct kvm_vcpu *vcpu);
void s390_vcpu_unblock(struct kvm_vcpu *vcpu);
void exit_sie(struct kvm_vcpu *vcpu);
void exit_sie_sync(struct kvm_vcpu *vcpu);
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
/* is cmma enabled */