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| author | gVisor bot <gvisor-bot@google.com> | 2020-06-11 01:54:24 +0000 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-06-11 01:54:24 +0000 |
| commit | 75e892c80dce1be97d1a98a368e6e0ae47768e86 (patch) | |
| tree | 2d46d2eea2e1e1675473c06eedaf8ccba094fcbd /pkg/sentry/platform/ring0 | |
| parent | a210c0fa92431d8cc1af544ccb7cbf2c7dd19866 (diff) | |
| parent | b436b9717eab8b0b5c39c931bca5f000df079836 (diff) | |
Merge release-20200522.0-127-gb436b9717 (automated)
Diffstat (limited to 'pkg/sentry/platform/ring0')
| -rw-r--r-- | pkg/sentry/platform/ring0/entry_impl_arm64.s | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/pkg/sentry/platform/ring0/entry_impl_arm64.s b/pkg/sentry/platform/ring0/entry_impl_arm64.s index ea202219a..2a19337d0 100644 --- a/pkg/sentry/platform/ring0/entry_impl_arm64.s +++ b/pkg/sentry/platform/ring0/entry_impl_arm64.s @@ -426,9 +426,17 @@ mmio_exit: MOVD R1, CPU_LAZY_VFP(RSV_REG) VFP_DISABLE - // MMIO_EXIT. - MOVD $0, R9 - MOVD R0, 0xffff000000001000(R9) + // Trigger MMIO_EXIT/_KVM_HYPERCALL_VMEXIT. + // + // To keep it simple, I used the address of exception table as the + // MMIO base address, so that I can trigger a MMIO-EXIT by forcibly writing + // a read-only space. + // Also, the length is engough to match a sufficient number of hypercall ID. + // Then, in host user space, I can calculate this address to find out + // which hypercall. + MRS VBAR_EL1, R9 + MOVD R0, 0x0(R9) + RET // HaltAndResume halts execution and point the pointer to the resume function. |