microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

KVM: arm64: Allow guest to set the OSLK bit 

Allow writes to OSLAR and forward the OSLK bit to OSLSR. Do nothing with
the value for now.

Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220203174159.2887882-4-oupton@google.com
This commit is contained in:
Oliver Upton 2022-02-03 17:41:56 +00:00 коммит произвёл Marc Zyngier
Родитель d42e26716d
Коммит f24adc65c5
2 изменённых файлов: 33 добавлений и 7 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

3
arch/arm64/include/asm/sysreg.h
Просмотреть файл

@ -128,12 +128,15 @@
#define SYS_DBGWVRn_EL1(n) sys_reg(2, 0, 0, n, 6)
#define SYS_DBGWCRn_EL1(n) sys_reg(2, 0, 0, n, 7)
#define SYS_MDRAR_EL1 sys_reg(2, 0, 1, 0, 0)
#define SYS_OSLAR_EL1 sys_reg(2, 0, 1, 0, 4)
#define SYS_OSLAR_OSLK BIT(0)
#define SYS_OSLSR_EL1 sys_reg(2, 0, 1, 1, 4)
#define SYS_OSLSR_OSLM_MASK (BIT(3) | BIT(0))
#define SYS_OSLSR_OSLM_NI 0
#define SYS_OSLSR_OSLM_IMPLEMENTED BIT(3)
#define SYS_OSLSR_OSLK BIT(1)
#define SYS_OSDLR_EL1 sys_reg(2, 0, 1, 3, 4)
#define SYS_DBGPRCR_EL1 sys_reg(2, 0, 1, 4, 4)

37
arch/arm64/kvm/sys_regs.c
Просмотреть файл

@ -44,6 +44,10 @@
* 64bit interface.
*/
static int reg_from_user(u64 *val, const void __user *uaddr, u64 id);
static int reg_to_user(void __user *uaddr, const u64 *val, u64 id);
static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
static bool read_from_write_only(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
@ -287,6 +291,24 @@ static bool trap_loregion(struct kvm_vcpu *vcpu,
return trap_raz_wi(vcpu, p, r);
}
static bool trap_oslar_el1(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
u64 oslsr;
if (!p->is_write)
return read_from_write_only(vcpu, p, r);
/* Forward the OSLK bit to OSLSR */
oslsr = __vcpu_sys_reg(vcpu, OSLSR_EL1) & ~SYS_OSLSR_OSLK;
if (p->regval & SYS_OSLAR_OSLK)
oslsr |= SYS_OSLSR_OSLK;
__vcpu_sys_reg(vcpu, OSLSR_EL1) = oslsr;
return true;
}
static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
@ -309,9 +331,14 @@ static int set_oslsr_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
if (err)
return err;
if (val != rd->val)
/*
* The only modifiable bit is the OSLK bit. Refuse the write if
* userspace attempts to change any other bit in the register.
*/
if ((val ^ rd->val) & ~SYS_OSLSR_OSLK)
return -EINVAL;
__vcpu_sys_reg(vcpu, rd->reg) = val;
return 0;
}
@ -1180,10 +1207,6 @@ static bool access_raz_id_reg(struct kvm_vcpu *vcpu,
return __access_id_reg(vcpu, p, r, true);
}
static int reg_from_user(u64 *val, const void __user *uaddr, u64 id);
static int reg_to_user(void __user *uaddr, const u64 *val, u64 id);
static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
/* Visibility overrides for SVE-specific control registers */
static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
@ -1463,7 +1486,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
DBG_BCR_BVR_WCR_WVR_EL1(15),
{ SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi },
{ SYS_DESC(SYS_OSLAR_EL1), trap_raz_wi },
{ SYS_DESC(SYS_OSLAR_EL1), trap_oslar_el1 },
{ SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1, reset_val, OSLSR_EL1,
SYS_OSLSR_OSLM_IMPLEMENTED, .set_user = set_oslsr_el1, },
{ SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi },
@ -1937,7 +1960,7 @@ static const struct sys_reg_desc cp14_regs[] = {
DBGBXVR(0),
/* DBGOSLAR */
{ Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi },
{ Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_oslar_el1 },
DBGBXVR(1),
/* DBGOSLSR */
{ Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1, NULL, OSLSR_EL1 },