diff options
| author | Dexuan Cui <decui@microsoft.com> | 2023-08-24 10:07:05 +0200 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-08-25 02:04:56 +0200 |
| commit | 68f2f2bc163d4427b04f0fb6421f091f948175fe (patch) | |
| tree | 0c7d17056c380a3445cb7197796d089748daf8c2 /drivers/hv/hv.c | |
| parent | x86/hyperv: Support hypercalls for fully enlightened TDX guests (diff) | |
| download | linux-68f2f2bc163d4427b04f0fb6421f091f948175fe.tar.xz linux-68f2f2bc163d4427b04f0fb6421f091f948175fe.zip | |
Drivers: hv: vmbus: Support fully enlightened TDX guests
Add Hyper-V specific code so that a fully enlightened TDX guest (i.e.
without the paravisor) can run on Hyper-V:
Don't use hv_vp_assist_page. Use GHCI instead.
Don't try to use the unsupported HV_REGISTER_CRASH_CTL.
Don't trust (use) Hyper-V's TLB-flushing hypercalls.
Don't use lazy EOI.
Share the SynIC Event/Message pages with the hypervisor.
Don't use the Hyper-V TSC page for now, because non-trivial work is
required to share the page with the hypervisor.
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230824080712.30327-4-decui@microsoft.com
Diffstat (limited to 'drivers/hv/hv.c')
| -rw-r--r-- | drivers/hv/hv.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index ec6e35a0d9bf..d1064118a72f 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -121,11 +121,15 @@ int hv_synic_alloc(void) (void *)get_zeroed_page(GFP_ATOMIC); if (hv_cpu->synic_event_page == NULL) { pr_err("Unable to allocate SYNIC event page\n"); + + free_page((unsigned long)hv_cpu->synic_message_page); + hv_cpu->synic_message_page = NULL; goto err; } } - if (hv_isolation_type_en_snp()) { + if (!ms_hyperv.paravisor_present && + (hv_isolation_type_en_snp() || hv_isolation_type_tdx())) { ret = set_memory_decrypted((unsigned long) hv_cpu->synic_message_page, 1); if (ret) { @@ -174,7 +178,8 @@ void hv_synic_free(void) = per_cpu_ptr(hv_context.cpu_context, cpu); /* It's better to leak the page if the encryption fails. */ - if (hv_isolation_type_en_snp()) { + if (!ms_hyperv.paravisor_present && + (hv_isolation_type_en_snp() || hv_isolation_type_tdx())) { if (hv_cpu->synic_message_page) { ret = set_memory_encrypted((unsigned long) hv_cpu->synic_message_page, 1); |