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| author | Jinank Jain <jinankjain@linux.microsoft.com> | 2023-01-02 07:12:52 +0000 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-01-17 13:36:43 +0000 |
| commit | 7fec185a56f45b98d9547982370c2ab33f0f72b5 (patch) | |
| tree | e090edfd6a998b4322f1bc4969351883ba977486 /drivers/hv/hv.c | |
| parent | c4bdf94f97c86bdee8bacc87f8f85dc67866c928 (diff) | |
| download | lwn-7fec185a56f45b98d9547982370c2ab33f0f72b5.tar.gz lwn-7fec185a56f45b98d9547982370c2ab33f0f72b5.zip | |
Drivers: hv: Setup synic registers in case of nested root partition
Child partitions are free to allocate SynIC message and event page but in
case of root partition it must use the pages allocated by Microsoft
Hypervisor (MSHV). Base address for these pages can be found using
synthetic MSRs exposed by MSHV. There is a slight difference in those MSRs
for nested vs non-nested root partition.
Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/cb951fb1ad6814996fc54f4a255c5841a20a151f.1672639707.git.jinankjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv/hv.c')
| -rw-r--r-- | drivers/hv/hv.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 4d6480d57546..8b0dd8e5244d 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -147,7 +147,7 @@ int hv_synic_alloc(void) * Synic message and event pages are allocated by paravisor. * Skip these pages allocation here. */ - if (!hv_isolation_type_snp()) { + if (!hv_isolation_type_snp() && !hv_root_partition) { hv_cpu->synic_message_page = (void *)get_zeroed_page(GFP_ATOMIC); if (hv_cpu->synic_message_page == NULL) { @@ -216,7 +216,7 @@ void hv_synic_enable_regs(unsigned int cpu) simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP); simp.simp_enabled = 1; - if (hv_isolation_type_snp()) { + if (hv_isolation_type_snp() || hv_root_partition) { hv_cpu->synic_message_page = memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT, HV_HYP_PAGE_SIZE, MEMREMAP_WB); @@ -233,7 +233,7 @@ void hv_synic_enable_regs(unsigned int cpu) siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 1; - if (hv_isolation_type_snp()) { + if (hv_isolation_type_snp() || hv_root_partition) { hv_cpu->synic_event_page = memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT, HV_HYP_PAGE_SIZE, MEMREMAP_WB); @@ -315,20 +315,24 @@ void hv_synic_disable_regs(unsigned int cpu) * addresses. */ simp.simp_enabled = 0; - if (hv_isolation_type_snp()) + if (hv_isolation_type_snp() || hv_root_partition) { memunmap(hv_cpu->synic_message_page); - else + hv_cpu->synic_message_page = NULL; + } else { simp.base_simp_gpa = 0; + } hv_set_register(HV_REGISTER_SIMP, simp.as_uint64); siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 0; - if (hv_isolation_type_snp()) + if (hv_isolation_type_snp() || hv_root_partition) { memunmap(hv_cpu->synic_event_page); - else + hv_cpu->synic_event_page = NULL; + } else { siefp.base_siefp_gpa = 0; + } hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64); |