diff options
| author | Dave Martin <Dave.Martin@arm.com> | 2019-04-05 17:17:08 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-04-18 17:14:01 +0100 |
| commit | 8ae6efdde451512e855be576dd0cdf4cb394c289 (patch) | |
| tree | fa30f040fca83f35d6e98e1b8a776e66543e05ea /arch/arm64/include/uapi | |
| parent | 700698a8a9741063c9804c7bce2dbec6c8d69f3d (diff) | |
KVM: arm64/sve: Clean up UAPI register ID definitions
Currently, the SVE register ID macros are not all defined in the
same way, and advertise the fact that FFR maps onto the nonexistent
predicate register P16. This is really just for kernel
convenience, and may lead userspace into bad habits.
Instead, this patch masks the ID macro arguments so that
architecturally invalid register numbers will not be passed through
any more, and uses a literal KVM_REG_ARM64_SVE_FFR_BASE macro to
define KVM_REG_ARM64_SVE_FFR(), similarly to the way the _ZREG()
and _PREG() macros are defined.
Rather than plugging in magic numbers for the number of Z- and P-
registers and the maximum possible number of register slices, this
patch provides definitions for those too. Userspace is going to
need them in any case, and it makes sense for them to come from
<uapi/asm/kvm.h>.
sve_reg_to_region() uses convenience constants that are defined in
a different way, and also makes use of the fact that the FFR IDs
are really contiguous with the P15 IDs, so this patch retains the
existing convenience constants in guest.c, supplemented with a
couple of sanity checks to check for consistency with the UAPI
header.
Fixes: e1c9c98345b3 ("KVM: arm64/sve: Add SVE support to register access ioctl interface")
Suggested-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/uapi')
| -rw-r--r-- | arch/arm64/include/uapi/asm/kvm.h | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 6963b7e8062b..2a04ef015469 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -35,6 +35,7 @@ #include <linux/psci.h> #include <linux/types.h> #include <asm/ptrace.h> +#include <asm/sve_context.h> #define __KVM_HAVE_GUEST_DEBUG #define __KVM_HAVE_IRQ_LINE @@ -233,16 +234,29 @@ struct kvm_vcpu_events { /* Z- and P-regs occupy blocks at the following offsets within this range: */ #define KVM_REG_ARM64_SVE_ZREG_BASE 0 #define KVM_REG_ARM64_SVE_PREG_BASE 0x400 +#define KVM_REG_ARM64_SVE_FFR_BASE 0x600 -#define KVM_REG_ARM64_SVE_ZREG(n, i) (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | \ - KVM_REG_ARM64_SVE_ZREG_BASE | \ - KVM_REG_SIZE_U2048 | \ - ((n) << 5) | (i)) -#define KVM_REG_ARM64_SVE_PREG(n, i) (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | \ - KVM_REG_ARM64_SVE_PREG_BASE | \ - KVM_REG_SIZE_U256 | \ - ((n) << 5) | (i)) -#define KVM_REG_ARM64_SVE_FFR(i) KVM_REG_ARM64_SVE_PREG(16, i) +#define KVM_ARM64_SVE_NUM_ZREGS __SVE_NUM_ZREGS +#define KVM_ARM64_SVE_NUM_PREGS __SVE_NUM_PREGS + +#define KVM_ARM64_SVE_MAX_SLICES 32 + +#define KVM_REG_ARM64_SVE_ZREG(n, i) \ + (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | KVM_REG_ARM64_SVE_ZREG_BASE | \ + KVM_REG_SIZE_U2048 | \ + (((n) & (KVM_ARM64_SVE_NUM_ZREGS - 1)) << 5) | \ + ((i) & (KVM_ARM64_SVE_MAX_SLICES - 1))) + +#define KVM_REG_ARM64_SVE_PREG(n, i) \ + (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | KVM_REG_ARM64_SVE_PREG_BASE | \ + KVM_REG_SIZE_U256 | \ + (((n) & (KVM_ARM64_SVE_NUM_PREGS - 1)) << 5) | \ + ((i) & (KVM_ARM64_SVE_MAX_SLICES - 1))) + +#define KVM_REG_ARM64_SVE_FFR(i) \ + (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | KVM_REG_ARM64_SVE_FFR_BASE | \ + KVM_REG_SIZE_U256 | \ + ((i) & (KVM_ARM64_SVE_MAX_SLICES - 1))) /* Vector lengths pseudo-register: */ #define KVM_REG_ARM64_SVE_VLS (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | \ |