diff options
| author | Michal Orzel <michal.orzel@arm.com> | 2021-10-13 14:33:52 +0200 |
|---|---|---|
| committer | Ian Jackson <iwj@xenproject.org> | 2021-10-13 15:10:38 +0100 |
| commit | dbb948110a0e23a8081882a980038e9c0f6aab88 (patch) | |
| tree | c168641cd3f8298e0fdf2202e42301cba1adca3a /xen/include | |
| parent | c8c6cd9eee9aa98c696607adb9d1e422da161110 (diff) | |
xen: Expose the PMU to the guests
Add parameter vpmu to xl domain configuration syntax
to enable the access to PMU registers by disabling
the PMU traps(currently only for ARM).
The current status is that the PMU registers are not
virtualized and the physical registers are directly
accessible when this parameter is enabled. There is no
interrupt support and Xen will not save/restore the
register values on context switches.
According to Arm Arm, section D7.1:
"The Performance Monitors Extension is common
to AArch64 operation and AArch32 operation."
That means we have an ensurance that if PMU is
present in one exception state, it must also be
present in the other.
Please note that this feature is experimental.
Signed-off-by: Michal Orzel <michal.orzel@arm.com>
Signed-off-by: Julien Grall <julien@xen.org>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <iwj@xenproject.org>
Diffstat (limited to 'xen/include')
| -rw-r--r-- | xen/include/asm-arm/domain.h | 1 | ||||
| -rw-r--r-- | xen/include/public/domctl.h | 4 |
2 files changed, 4 insertions, 1 deletions
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h index c9277b5c6d..14e575288f 100644 --- a/xen/include/asm-arm/domain.h +++ b/xen/include/asm-arm/domain.h @@ -166,6 +166,7 @@ struct arch_vcpu /* HYP configuration */ register_t hcr_el2; + register_t mdcr_el2; uint32_t teecr, teehbr; /* ThumbEE, 32-bit guests only */ #ifdef CONFIG_ARM_32 diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h index 4cb3f662c2..a53cbd16f4 100644 --- a/xen/include/public/domctl.h +++ b/xen/include/public/domctl.h @@ -71,9 +71,11 @@ struct xen_domctl_createdomain { #define _XEN_DOMCTL_CDF_nested_virt 6 #define XEN_DOMCTL_CDF_nested_virt (1U << _XEN_DOMCTL_CDF_nested_virt) #define XEN_DOMCTL_CDF_vpci (1U << 7) +/* Should we expose the vPMU to the guest? */ +#define XEN_DOMCTL_CDF_vpmu (1U << 8) /* Max XEN_DOMCTL_CDF_* constant. Used for ABI checking. */ -#define XEN_DOMCTL_CDF_MAX XEN_DOMCTL_CDF_vpci +#define XEN_DOMCTL_CDF_MAX XEN_DOMCTL_CDF_vpmu uint32_t flags; |