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| author | Marc Zyngier <maz@kernel.org> | 2023-06-09 19:21:49 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-06-13 02:17:23 +0300 |
| commit | 9e7462bbe00d8431694720804a50b8f48d8ed0b0 (patch) | |
| tree | 8cf5a26721d1e5ee3bbaa9d7ede909da1c3effd8 /arch/arm64/kvm | |
| parent | 7a26e1f51e3c26a1b4a1f087e2056f1554365682 (diff) | |
| download | linux-9e7462bbe00d8431694720804a50b8f48d8ed0b0.tar.xz | |
arm64: Allow EL1 physical timer access when running VHE
To initialise the timer access from EL2 when HCR_EL2.E2H is set,
we must make use the CNTHCTL_EL2 formap used is appropriate.
This amounts to shifting the timer/counter enable bits by 10
to the left.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20230609162200.2024064-7-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp-init.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S index a6d67c2bb5ae..f9ee10e29497 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S @@ -95,6 +95,15 @@ SYM_CODE_START_LOCAL(___kvm_hyp_init) ldr x1, [x0, #NVHE_INIT_HCR_EL2] msr hcr_el2, x1 + mov x2, #HCR_E2H + and x2, x1, x2 + cbz x2, 1f + + mrs x1, cnthctl_el2 + and x1, x1, #~(BIT(0) | BIT(1)) + orr x1, x1, #(BIT(10) | BIT(11)) + msr cnthctl_el2, x1 +1: ldr x1, [x0, #NVHE_INIT_VTTBR] msr vttbr_el2, x1 |