diff options
| author | Tianyu Lan <tiala@microsoft.com> | 2023-08-18 12:29:14 +0200 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-08-22 02:38:20 +0200 |
| commit | 193061ea0a50c13f72b907e6fa7befa6e15a4302 (patch) | |
| tree | f214cd173c276e2ba2ea09dec06117ae84a1c042 /drivers/hv/hv_common.c | |
| parent | x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest (diff) | |
| download | linux-193061ea0a50c13f72b907e6fa7befa6e15a4302.tar.xz linux-193061ea0a50c13f72b907e6fa7befa6e15a4302.zip | |
drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest
Hypervisor needs to access input arg, VMBus synic event and
message pages. Mark these pages unencrypted in the SEV-SNP
guest and free them only if they have been marked encrypted
successfully.
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-5-ltykernel@gmail.com
Diffstat (limited to 'drivers/hv/hv_common.c')
| -rw-r--r-- | drivers/hv/hv_common.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 4b4aa53c34c2..2d43ba2bc925 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -24,6 +24,7 @@ #include <linux/kmsg_dump.h> #include <linux/slab.h> #include <linux/dma-map-ops.h> +#include <linux/set_memory.h> #include <asm/hyperv-tlfs.h> #include <asm/mshyperv.h> @@ -359,6 +360,7 @@ int hv_common_cpu_init(unsigned int cpu) u64 msr_vp_index; gfp_t flags; int pgcount = hv_root_partition ? 2 : 1; + int ret; /* hv_cpu_init() can be called with IRQs disabled from hv_resume() */ flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL; @@ -378,6 +380,17 @@ int hv_common_cpu_init(unsigned int cpu) outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg); *outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE; } + + if (hv_isolation_type_en_snp()) { + ret = set_memory_decrypted((unsigned long)*inputarg, pgcount); + if (ret) { + kfree(*inputarg); + *inputarg = NULL; + return ret; + } + + memset(*inputarg, 0x00, pgcount * PAGE_SIZE); + } } msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX); |