diff options
| author | Will Deacon <will.deacon@arm.com> | 2016-09-22 11:35:43 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-02-02 18:33:01 +0000 |
| commit | f85279b4bd481a1a0697c1d2a8a5f15de216b120 (patch) | |
| tree | 85ae5ff3b6cfae4ea9ef703d31cfd0a2e46e9983 /arch/arm64/include/asm/kvm_host.h | |
| parent | 3d29a9a0f88300b7ccb642ebee61b331ef0a8c27 (diff) | |
arm64: KVM: Save/restore the host SPE state when entering/leaving a VM
The SPE buffer is virtually addressed, using the page tables of the CPU
MMU. Unusually, this means that the EL0/1 page table may be live whilst
we're executing at EL2 on non-VHE configurations. When VHE is in use,
we can use the same property to profile the guest behind its back.
This patch adds the relevant disabling and flushing code to KVM so that
the host can make use of SPE without corrupting guest memory, and any
attempts by a guest to use SPE will result in a trap.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alex Bennée <alex.bennee@linaro.org>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/kvm_host.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e5050388e062..443b387021f2 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -229,7 +229,12 @@ struct kvm_vcpu_arch { /* Pointer to host CPU context */ kvm_cpu_context_t *host_cpu_context; - struct kvm_guest_debug_arch host_debug_state; + struct { + /* {Break,watch}point registers */ + struct kvm_guest_debug_arch regs; + /* Statistical profiling extension */ + u64 pmscr_el1; + } host_debug_state; /* VGIC state */ struct vgic_cpu vgic_cpu; |