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KVM: SEV: provide helpers to charge/uncharge misc_cg

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Avoid code duplication across all callers of misc_cg_try_charge and
misc_cg_uncharge.  The resource type for KVM is always derived from
sev->es_active, and the quantity is always 1.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-11-11 10:02:26 -05:00
parent f4d3165370
commit 91b692a03c
1 changed files with 15 additions and 7 deletions
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22
arch/x86/kvm/svm/sev.c
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@ -120,16 +120,26 @@ static bool __sev_recycle_asids(int min_asid, int max_asid)
return true;
}
static int sev_misc_cg_try_charge(struct kvm_sev_info *sev)
{
enum misc_res_type type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
return misc_cg_try_charge(type, sev->misc_cg, 1);
}
static void sev_misc_cg_uncharge(struct kvm_sev_info *sev)
{
enum misc_res_type type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
misc_cg_uncharge(type, sev->misc_cg, 1);
}
static int sev_asid_new(struct kvm_sev_info *sev)
{
int asid, min_asid, max_asid, ret;
bool retry = true;
enum misc_res_type type;
type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
WARN_ON(sev->misc_cg);
sev->misc_cg = get_current_misc_cg();
ret = misc_cg_try_charge(type, sev->misc_cg, 1);
ret = sev_misc_cg_try_charge(sev);
if (ret) {
put_misc_cg(sev->misc_cg);
sev->misc_cg = NULL;
@ -162,7 +172,7 @@ again:
return asid;
e_uncharge:
misc_cg_uncharge(type, sev->misc_cg, 1);
sev_misc_cg_uncharge(sev);
put_misc_cg(sev->misc_cg);
sev->misc_cg = NULL;
return ret;
@ -179,7 +189,6 @@ static void sev_asid_free(struct kvm_sev_info *sev)
{
struct svm_cpu_data *sd;
int cpu;
enum misc_res_type type;
mutex_lock(&sev_bitmap_lock);
@ -192,8 +201,7 @@ static void sev_asid_free(struct kvm_sev_info *sev)
mutex_unlock(&sev_bitmap_lock);
type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
misc_cg_uncharge(type, sev->misc_cg, 1);
sev_misc_cg_uncharge(sev);
put_misc_cg(sev->misc_cg);
sev->misc_cg = NULL;
}