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arm64: KVM: VHE: Implement VHE activate/deactivate_traps

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Running the kernel in HYP mode requires the HCR_E2H bit to be set
at all times, and the HCR_TGE bit to be set when running as a host
(and cleared when running as a guest). At the same time, the vector
 must be set to the current role of the kernel (either host or
hypervisor), and a couple of system registers differ between VHE
and non-VHE.

We implement these by using another set of alternate functions
that get dynamically patched.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-01-29 15:47:55 +00:00
parent 328762247c
commit 68908bf789
3 changed files with 53 additions and 8 deletions
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3
arch/arm64/include/asm/kvm_arm.h
View File

@ -23,6 +23,7 @@
#include <asm/types.h>
/* Hyp Configuration Register (HCR) bits */
#define HCR_E2H (UL(1) << 34)
#define HCR_ID (UL(1) << 33)
#define HCR_CD (UL(1) << 32)
#define HCR_RW_SHIFT 31
@ -81,7 +82,7 @@
HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW)
#define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF)
#define HCR_INT_OVERRIDE (HCR_FMO | HCR_IMO)
#define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
/* Hyp System Control Register (SCTLR_EL2) bits */
#define SCTLR_EL2_EE (1 << 25)

3
arch/arm64/include/asm/kvm_emulate.h
View File

@ -29,6 +29,7 @@
#include <asm/kvm_mmio.h>
#include <asm/ptrace.h>
#include <asm/cputype.h>
#include <asm/virt.h>
unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
@ -43,6 +44,8 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
{
vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
if (is_kernel_in_hyp_mode())
vcpu->arch.hcr_el2 |= HCR_E2H;
if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
vcpu->arch.hcr_el2 &= ~HCR_RW;
}

55
arch/arm64/kvm/hyp/switch.c
View File

@ -15,6 +15,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <asm/kvm_asm.h>
#include "hyp.h"
static bool __hyp_text __fpsimd_enabled_nvhe(void)
@ -36,6 +38,31 @@ bool __hyp_text __fpsimd_enabled(void)
return __fpsimd_is_enabled()();
}
static void __hyp_text __activate_traps_vhe(void)
{
u64 val;
val = read_sysreg(cpacr_el1);
val |= CPACR_EL1_TTA;
val &= ~CPACR_EL1_FPEN;
write_sysreg(val, cpacr_el1);
write_sysreg(__kvm_hyp_vector, vbar_el1);
}
static void __hyp_text __activate_traps_nvhe(void)
{
u64 val;
val = CPTR_EL2_DEFAULT;
val |= CPTR_EL2_TTA | CPTR_EL2_TFP;
write_sysreg(val, cptr_el2);
}
static hyp_alternate_select(__activate_traps_arch,
__activate_traps_nvhe, __activate_traps_vhe,
ARM64_HAS_VIRT_HOST_EXTN);
static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
{
u64 val;
@ -55,20 +82,34 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
write_sysreg(val, hcr_el2);
/* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */
write_sysreg(1 << 15, hstr_el2);
val = CPTR_EL2_DEFAULT;
val |= CPTR_EL2_TTA | CPTR_EL2_TFP;
write_sysreg(val, cptr_el2);
write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
__activate_traps_arch()();
}
static void __hyp_text __deactivate_traps_vhe(void)
{
extern char vectors[]; /* kernel exception vectors */
write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
write_sysreg(CPACR_EL1_FPEN, cpacr_el1);
write_sysreg(vectors, vbar_el1);
}
static void __hyp_text __deactivate_traps_nvhe(void)
{
write_sysreg(HCR_RW, hcr_el2);
write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
}
static hyp_alternate_select(__deactivate_traps_arch,
__deactivate_traps_nvhe, __deactivate_traps_vhe,
ARM64_HAS_VIRT_HOST_EXTN);
static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
{
write_sysreg(HCR_RW, hcr_el2);
__deactivate_traps_arch()();
write_sysreg(0, hstr_el2);
write_sysreg(read_sysreg(mdcr_el2) & MDCR_EL2_HPMN_MASK, mdcr_el2);
write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
}
static void __hyp_text __activate_vm(struct kvm_vcpu *vcpu)