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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [PATCH V3 05/13] HV: Add Write/Read MSR registers via ghcb page
From: Tianyu Lan <ltykernel@xxxxxxxxx> Sent: Monday, August 9, 2021 10:56 AM
> Subject: [PATCH V3 05/13] HV: Add Write/Read MSR registers via ghcb page
See previous comments about tag in the Subject line.
> Hyper-V provides GHCB protocol to write Synthetic Interrupt
> Controller MSR registers in Isolation VM with AMD SEV SNP
> and these registers are emulated by hypervisor directly.
> Hyper-V requires to write SINTx MSR registers twice. First
> writes MSR via GHCB page to communicate with hypervisor
> and then writes wrmsr instruction to talk with paravisor
> which runs in VMPL0. Guest OS ID MSR also needs to be set
> via GHCB.
>
> Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> ---
> Change since v1:
> * Introduce sev_es_ghcb_hv_call_simple() and share code
> between SEV and Hyper-V code.
> ---
> arch/x86/hyperv/hv_init.c | 33 ++-------
> arch/x86/hyperv/ivm.c | 110 +++++++++++++++++++++++++++++
> arch/x86/include/asm/mshyperv.h | 78 +++++++++++++++++++-
> arch/x86/include/asm/sev.h | 3 +
> arch/x86/kernel/cpu/mshyperv.c | 3 +
> arch/x86/kernel/sev-shared.c | 63 ++++++++++-------
> drivers/hv/hv.c | 121 ++++++++++++++++++++++----------
> include/asm-generic/mshyperv.h | 12 +++-
> 8 files changed, 329 insertions(+), 94 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index b3683083208a..ab0b33f621e7 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -423,7 +423,7 @@ void __init hyperv_init(void)
> goto clean_guest_os_id;
>
> if (hv_isolation_type_snp()) {
> - ms_hyperv.ghcb_base = alloc_percpu(void *);
> + ms_hyperv.ghcb_base = alloc_percpu(union hv_ghcb __percpu *);
union hv_ghcb isn't defined. It is not added until patch 6 of the series.
> if (!ms_hyperv.ghcb_base)
> goto clean_guest_os_id;
>
> @@ -432,6 +432,9 @@ void __init hyperv_init(void)
> ms_hyperv.ghcb_base = NULL;
> goto clean_guest_os_id;
> }
> +
> + /* Hyper-V requires to write guest os id via ghcb in SNP IVM. */
> + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, guest_id);
> }
>
> rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> @@ -523,6 +526,7 @@ void hyperv_cleanup(void)
>
> /* Reset our OS id */
> wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
> + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, 0);
>
> /*
> * Reset hypercall page reference before reset the page,
> @@ -596,30 +600,3 @@ bool hv_is_hyperv_initialized(void)
> return hypercall_msr.enable;
> }
> EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
> -
> -enum hv_isolation_type hv_get_isolation_type(void)
> -{
> - if (!(ms_hyperv.priv_high & HV_ISOLATION))
> - return HV_ISOLATION_TYPE_NONE;
> - return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b);
> -}
> -EXPORT_SYMBOL_GPL(hv_get_isolation_type);
> -
> -bool hv_is_isolation_supported(void)
> -{
> - if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
> - return 0;
> -
> - if (!hypervisor_is_type(X86_HYPER_MS_HYPERV))
> - return 0;
> -
> - return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;
> -}
> -
> -DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
> -
> -bool hv_isolation_type_snp(void)
> -{
> - return static_branch_unlikely(&isolation_type_snp);
> -}
> -EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
> diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
> index 8c905ffdba7f..ec0e5c259740 100644
> --- a/arch/x86/hyperv/ivm.c
> +++ b/arch/x86/hyperv/ivm.c
> @@ -6,6 +6,8 @@
> * Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> */
>
> +#include <linux/types.h>
> +#include <linux/bitfield.h>
> #include <linux/hyperv.h>
> #include <linux/types.h>
> #include <linux/bitfield.h>
> @@ -13,6 +15,114 @@
> #include <asm/io.h>
> #include <asm/mshyperv.h>
>
> +void hv_ghcb_msr_write(u64 msr, u64 value)
> +{
> + union hv_ghcb *hv_ghcb;
> + void **ghcb_base;
> + unsigned long flags;
> +
> + if (!ms_hyperv.ghcb_base)
> + return;
> +
> + WARN_ON(in_nmi());
> +
> + local_irq_save(flags);
> + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
> + hv_ghcb = (union hv_ghcb *)*ghcb_base;
> + if (!hv_ghcb) {
> + local_irq_restore(flags);
> + return;
> + }
> +
> + ghcb_set_rcx(&hv_ghcb->ghcb, msr);
> + ghcb_set_rax(&hv_ghcb->ghcb, lower_32_bits(value));
> + ghcb_set_rdx(&hv_ghcb->ghcb, value >> 32);
Having used lower_32_bits() in the previous line, perhaps use
upper_32_bits() here?
> +
> + if (sev_es_ghcb_hv_call_simple(&hv_ghcb->ghcb, SVM_EXIT_MSR, 1, 0))
> + pr_warn("Fail to write msr via ghcb %llx.\n", msr);
> +
> + local_irq_restore(flags);
> +}
> +
> +void hv_ghcb_msr_read(u64 msr, u64 *value)
> +{
> + union hv_ghcb *hv_ghcb;
> + void **ghcb_base;
> + unsigned long flags;
> +
> + if (!ms_hyperv.ghcb_base)
> + return;
> +
> + WARN_ON(in_nmi());
> +
> + local_irq_save(flags);
> + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
> + hv_ghcb = (union hv_ghcb *)*ghcb_base;
> + if (!hv_ghcb) {
> + local_irq_restore(flags);
> + return;
> + }
> +
> + ghcb_set_rcx(&hv_ghcb->ghcb, msr);
> + if (sev_es_ghcb_hv_call_simple(&hv_ghcb->ghcb, SVM_EXIT_MSR, 0, 0))
> + pr_warn("Fail to read msr via ghcb %llx.\n", msr);
> + else
> + *value = (u64)lower_32_bits(hv_ghcb->ghcb.save.rax)
> + | ((u64)lower_32_bits(hv_ghcb->ghcb.save.rdx) << 32);
> + local_irq_restore(flags);
> +}
> +
> +void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value)
> +{
> + hv_ghcb_msr_read(msr, value);
> +}
> +EXPORT_SYMBOL_GPL(hv_sint_rdmsrl_ghcb);
> +
> +void hv_sint_wrmsrl_ghcb(u64 msr, u64 value)
> +{
> + hv_ghcb_msr_write(msr, value);
> +
> + /* Write proxy bit vua wrmsrl instruction. */
s/vua/via/
> + if (msr >= HV_X64_MSR_SINT0 && msr <= HV_X64_MSR_SINT15)
> + wrmsrl(msr, value | 1 << 20);
> +}
> +EXPORT_SYMBOL_GPL(hv_sint_wrmsrl_ghcb);
> +
> +void hv_signal_eom_ghcb(void)
> +{
> + hv_sint_wrmsrl_ghcb(HV_X64_MSR_EOM, 0);
> +}
> +EXPORT_SYMBOL_GPL(hv_signal_eom_ghcb);
Is there a reason for this to be a function instead of a #define?
Seemingly parallel calls such as hv_set_synic_state_ghcb()
are #defines.
> +
> +enum hv_isolation_type hv_get_isolation_type(void)
> +{
> + if (!(ms_hyperv.priv_high & HV_ISOLATION))
> + return HV_ISOLATION_TYPE_NONE;
> + return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b);
> +}
> +EXPORT_SYMBOL_GPL(hv_get_isolation_type);
> +
> +/*
> + * hv_is_isolation_supported - Check system runs in the Hyper-V
> + * isolation VM.
> + */
> +bool hv_is_isolation_supported(void)
> +{
> + return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;
> +}
> +
> +DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
> +
> +/*
> + * hv_isolation_type_snp - Check system runs in the AMD SEV-SNP based
> + * isolation VM.
> + */
> +bool hv_isolation_type_snp(void)
> +{
> + return static_branch_unlikely(&isolation_type_snp);
> +}
> +EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
> +
hv_isolation_type_snp() is implemented here in a file under arch/x86,
but it is called from architecture independent code in drivers/hv, so it
needs to do the right thing on ARM64 as well as x86. For an example,
see the handling of hv_is_isolation_supported() in the latest linux-next
tree.
> /*
> * hv_mark_gpa_visibility - Set pages visible to host via hvcall.
> *
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index 87a386fa97f7..730985676ea3 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -30,6 +30,63 @@ static inline u64 hv_get_register(unsigned int reg)
> return value;
> }
>
> +#define hv_get_sint_reg(val, reg) { \
> + if (hv_isolation_type_snp()) \
> + hv_get_##reg##_ghcb(&val); \
> + else \
> + rdmsrl(HV_X64_MSR_##reg, val); \
> + }
> +
> +#define hv_set_sint_reg(val, reg) { \
> + if (hv_isolation_type_snp()) \
> + hv_set_##reg##_ghcb(val); \
> + else \
> + wrmsrl(HV_X64_MSR_##reg, val); \
> + }
> +
> +
> +#define hv_get_simp(val) hv_get_sint_reg(val, SIMP)
> +#define hv_get_siefp(val) hv_get_sint_reg(val, SIEFP)
> +
> +#define hv_set_simp(val) hv_set_sint_reg(val, SIMP)
> +#define hv_set_siefp(val) hv_set_sint_reg(val, SIEFP)
> +
> +#define hv_get_synic_state(val) { \
> + if (hv_isolation_type_snp()) \
> + hv_get_synic_state_ghcb(&val); \
> + else \
> + rdmsrl(HV_X64_MSR_SCONTROL, val); \
Many of these registers that exist on x86 and ARM64 architectures
have new names without the "X64_MSR" portion. For
example, include/asm-generic/hyperv-tlfs.h defines
HV_REGISTER_SCONTROL. The x86-specific version of
hyperv-tlfs.h currently has a #define for HV_X64_MSR_SCONTROL,
but we would like to get rid of these temporary aliases.
So prefer to use HV_REGISTER_SCONTROL.
Same comment applies several places in this code for other
similar registers.
> + }
> +#define hv_set_synic_state(val) { \
> + if (hv_isolation_type_snp()) \
> + hv_set_synic_state_ghcb(val); \
> + else \
> + wrmsrl(HV_X64_MSR_SCONTROL, val); \
> + }
> +
> +#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
> +
> +#define hv_signal_eom() { \
> + if (hv_isolation_type_snp() && \
> + old_msg_type != HVMSG_TIMER_EXPIRED) \
Why is a test of the old_msg_type embedded in this macro?
And given that old_msg_type isn't a parameter of the
macro, its use is really weird.
> + hv_signal_eom_ghcb(); \
> + else \
> + wrmsrl(HV_X64_MSR_EOM, 0); \
> + }
> +
> +#define hv_get_synint_state(int_num, val) { \
> + if (hv_isolation_type_snp()) \0
> + hv_get_synint_state_ghcb(int_num, &val);\
> + else \
> + rdmsrl(HV_X64_MSR_SINT0 + int_num, val);\
> + }
> +#define hv_set_synint_state(int_num, val) { \
> + if (hv_isolation_type_snp()) \
> + hv_set_synint_state_ghcb(int_num, val); \
> + else \
> + wrmsrl(HV_X64_MSR_SINT0 + int_num, val);\
> + }
> +
> #define hv_get_raw_timer() rdtsc_ordered()
>
> void hyperv_vector_handler(struct pt_regs *regs);
> @@ -193,6 +250,25 @@ int hv_unmap_ioapic_interrupt(int ioapic_id, struct
> hv_interrupt_entry *entry);
> int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
> enum hv_mem_host_visibility visibility);
> int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool
> visible);
> +void hv_sint_wrmsrl_ghcb(u64 msr, u64 value);
> +void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value);
> +void hv_signal_eom_ghcb(void);
> +void hv_ghcb_msr_write(u64 msr, u64 value);
> +void hv_ghcb_msr_read(u64 msr, u64 *value);
> +
> +#define hv_get_synint_state_ghcb(int_num, val) \
> + hv_sint_rdmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val)
> +#define hv_set_synint_state_ghcb(int_num, val) \
> + hv_sint_wrmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val)
> +
> +#define hv_get_SIMP_ghcb(val) hv_sint_rdmsrl_ghcb(HV_X64_MSR_SIMP, val)
> +#define hv_set_SIMP_ghcb(val) hv_sint_wrmsrl_ghcb(HV_X64_MSR_SIMP, val)
> +
> +#define hv_get_SIEFP_ghcb(val) hv_sint_rdmsrl_ghcb(HV_X64_MSR_SIEFP, val)
> +#define hv_set_SIEFP_ghcb(val) hv_sint_wrmsrl_ghcb(HV_X64_MSR_SIEFP, val)
> +
> +#define hv_get_synic_state_ghcb(val)
> hv_sint_rdmsrl_ghcb(HV_X64_MSR_SCONTROL, val)
> +#define hv_set_synic_state_ghcb(val)
> hv_sint_wrmsrl_ghcb(HV_X64_MSR_SCONTROL, val)
> #else /* CONFIG_HYPERV */
> static inline void hyperv_init(void) {}
> static inline void hyperv_setup_mmu_ops(void) {}
> @@ -209,9 +285,9 @@ static inline int hyperv_flush_guest_mapping_range(u64 as,
> {
> return -1;
> }
> +static inline void hv_signal_eom_ghcb(void) { };
> #endif /* CONFIG_HYPERV */
>
> -
> #include <asm-generic/mshyperv.h>
>
> #endif
> diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
> index fa5cd05d3b5b..81beb2a8031b 100644
> --- a/arch/x86/include/asm/sev.h
> +++ b/arch/x86/include/asm/sev.h
> @@ -81,6 +81,9 @@ static __always_inline void sev_es_nmi_complete(void)
> __sev_es_nmi_complete();
> }
> extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
> +extern enum es_result sev_es_ghcb_hv_call_simple(struct ghcb *ghcb,
> + u64 exit_code, u64 exit_info_1,
> + u64 exit_info_2);
> #else
> static inline void sev_es_ist_enter(struct pt_regs *regs) { }
> static inline void sev_es_ist_exit(void) { }
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 2b7f396ef1a5..3633f871ac1e 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -318,6 +318,9 @@ static void __init ms_hyperv_init_platform(void)
>
> pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B
> 0x%x\n",
> ms_hyperv.isolation_config_a,
> ms_hyperv.isolation_config_b);
> +
> + if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP)
> + static_branch_enable(&isolation_type_snp);
> }
>
> if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) {
> diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
> index 9f90f460a28c..dd7f37de640b 100644
> --- a/arch/x86/kernel/sev-shared.c
> +++ b/arch/x86/kernel/sev-shared.c
> @@ -94,10 +94,9 @@ static void vc_finish_insn(struct es_em_ctxt *ctxt)
> ctxt->regs->ip += ctxt->insn.length;
> }
>
> -static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
> - struct es_em_ctxt *ctxt,
> - u64 exit_code, u64 exit_info_1,
> - u64 exit_info_2)
> +enum es_result sev_es_ghcb_hv_call_simple(struct ghcb *ghcb,
> + u64 exit_code, u64 exit_info_1,
> + u64 exit_info_2)
> {
> enum es_result ret;
>
> @@ -109,29 +108,45 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb
> *ghcb,
> ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
> ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
>
> - sev_es_wr_ghcb_msr(__pa(ghcb));
> VMGEXIT();
>
> - if ((ghcb->save.sw_exit_info_1 & 0xffffffff) == 1) {
> - u64 info = ghcb->save.sw_exit_info_2;
> - unsigned long v;
> -
> - info = ghcb->save.sw_exit_info_2;
> - v = info & SVM_EVTINJ_VEC_MASK;
> -
> - /* Check if exception information from hypervisor is sane. */
> - if ((info & SVM_EVTINJ_VALID) &&
> - ((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) &&
> - ((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) {
> - ctxt->fi.vector = v;
> - if (info & SVM_EVTINJ_VALID_ERR)
> - ctxt->fi.error_code = info >> 32;
> - ret = ES_EXCEPTION;
> - } else {
> - ret = ES_VMM_ERROR;
> - }
> - } else {
> + if ((ghcb->save.sw_exit_info_1 & 0xffffffff) == 1)
> + ret = ES_VMM_ERROR;
> + else
> ret = ES_OK;
> +
> + return ret;
> +}
> +
> +static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
> + struct es_em_ctxt *ctxt,
> + u64 exit_code, u64 exit_info_1,
> + u64 exit_info_2)
> +{
> + unsigned long v;
> + enum es_result ret;
> + u64 info;
> +
> + sev_es_wr_ghcb_msr(__pa(ghcb));
> +
> + ret = sev_es_ghcb_hv_call_simple(ghcb, exit_code, exit_info_1,
> + exit_info_2);
> + if (ret == ES_OK)
> + return ret;
> +
> + info = ghcb->save.sw_exit_info_2;
> + v = info & SVM_EVTINJ_VEC_MASK;
> +
> + /* Check if exception information from hypervisor is sane. */
> + if ((info & SVM_EVTINJ_VALID) &&
> + ((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) &&
> + ((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) {
> + ctxt->fi.vector = v;
> + if (info & SVM_EVTINJ_VALID_ERR)
> + ctxt->fi.error_code = info >> 32;
> + ret = ES_EXCEPTION;
> + } else {
> + ret = ES_VMM_ERROR;
> }
>
> return ret;
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index e83507f49676..59f7173c4d9f 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -8,6 +8,7 @@
> */
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <linux/io.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/slab.h>
> @@ -136,17 +137,24 @@ int hv_synic_alloc(void)
> tasklet_init(&hv_cpu->msg_dpc,
> vmbus_on_msg_dpc, (unsigned long) hv_cpu);
>
> - hv_cpu->synic_message_page =
> - (void *)get_zeroed_page(GFP_ATOMIC);
> - if (hv_cpu->synic_message_page == NULL) {
> - pr_err("Unable to allocate SYNIC message page\n");
> - goto err;
> - }
> + /*
> + * Synic message and event pages are allocated by paravisor.
> + * Skip these pages allocation here.
> + */
> + if (!hv_isolation_type_snp()) {
> + hv_cpu->synic_message_page =
> + (void *)get_zeroed_page(GFP_ATOMIC);
> + if (hv_cpu->synic_message_page == NULL) {
> + pr_err("Unable to allocate SYNIC message
> page\n");
> + goto err;
> + }
>
> - hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
> - if (hv_cpu->synic_event_page == NULL) {
> - pr_err("Unable to allocate SYNIC event page\n");
> - goto err;
> + hv_cpu->synic_event_page =
> + (void *)get_zeroed_page(GFP_ATOMIC);
> + if (hv_cpu->synic_event_page == NULL) {
> + pr_err("Unable to allocate SYNIC event page\n");
> + goto err;
> + }
> }
>
> hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
> @@ -173,10 +181,17 @@ void hv_synic_free(void)
> for_each_present_cpu(cpu) {
> struct hv_per_cpu_context *hv_cpu
> = per_cpu_ptr(hv_context.cpu_context, cpu);
> + free_page((unsigned long)hv_cpu->post_msg_page);
> +
> + /*
> + * Synic message and event pages are allocated by paravisor.
> + * Skip free these pages here.
> + */
> + if (hv_isolation_type_snp())
> + continue;
>
> free_page((unsigned long)hv_cpu->synic_event_page);
> free_page((unsigned long)hv_cpu->synic_message_page);
> - free_page((unsigned long)hv_cpu->post_msg_page);
You could skip making these changes to hv_synic_free(). If the message
and event pages aren't allocated, the pointers will be NULL and
free_page() will happily do nothing.
> }
>
> kfree(hv_context.hv_numa_map);
> @@ -199,26 +214,43 @@ void hv_synic_enable_regs(unsigned int cpu)
> union hv_synic_scontrol sctrl;
>
> /* Setup the Synic's message page */
> - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
> + hv_get_simp(simp.as_uint64);
This code is intended to be architecture independent and builds for
x86 and for ARM64. Changing the use of hv_get_register() and hv_set_register()
will fail badly when built for ARM64. I haven't completely thought through
what the best solution might be, but the current set of mappings from
hv_get_simp() down to hv_ghcb_msr_read() isn't going to work on ARM64.
Is it possible to hide all the x86-side complexity in the implementation of
hv_get_register()? Certain MSRs would have to be special-cased when
SNP isolation is enabled, but that might be easier than trying to no-op out
the ghcb machinery on the ARM64 side.
> simp.simp_enabled = 1;
> - simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
> - >> HV_HYP_PAGE_SHIFT;
>
> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
> + if (hv_isolation_type_snp()) {
> + hv_cpu->synic_message_page
> + = memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT,
> + HV_HYP_PAGE_SIZE, MEMREMAP_WB);
> + if (!hv_cpu->synic_message_page)
> + pr_err("Fail to map syinc message page.\n");
> + } else {
> + simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
> + >> HV_HYP_PAGE_SHIFT;
> + }
> +
> + hv_set_simp(simp.as_uint64);
>
> /* Setup the Synic's event page */
> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
> + hv_get_siefp(siefp.as_uint64);
> siefp.siefp_enabled = 1;
> - siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
> - >> HV_HYP_PAGE_SHIFT;
>
> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
> + if (hv_isolation_type_snp()) {
> + hv_cpu->synic_event_page =
> + memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT,
> + HV_HYP_PAGE_SIZE, MEMREMAP_WB);
> +
> + if (!hv_cpu->synic_event_page)
> + pr_err("Fail to map syinc event page.\n");
> + } else {
> + siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
> + >> HV_HYP_PAGE_SHIFT;
> + }
> + hv_set_siefp(siefp.as_uint64);
>
> /* Setup the shared SINT. */
> if (vmbus_irq != -1)
> enable_percpu_irq(vmbus_irq, 0);
> - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
> - VMBUS_MESSAGE_SINT);
> + hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
>
> shared_sint.vector = vmbus_interrupt;
> shared_sint.masked = false;
> @@ -233,14 +265,12 @@ void hv_synic_enable_regs(unsigned int cpu)
> #else
> shared_sint.auto_eoi = 0;
> #endif
> - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
> - shared_sint.as_uint64);
> + hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
>
> /* Enable the global synic bit */
> - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
> + hv_get_synic_state(sctrl.as_uint64);
> sctrl.enable = 1;
> -
> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
> + hv_set_synic_state(sctrl.as_uint64);
> }
>
> int hv_synic_init(unsigned int cpu)
> @@ -257,37 +287,50 @@ int hv_synic_init(unsigned int cpu)
> */
> void hv_synic_disable_regs(unsigned int cpu)
> {
> + struct hv_per_cpu_context *hv_cpu
> + = per_cpu_ptr(hv_context.cpu_context, cpu);
> union hv_synic_sint shared_sint;
> union hv_synic_simp simp;
> union hv_synic_siefp siefp;
> union hv_synic_scontrol sctrl;
>
> - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
> - VMBUS_MESSAGE_SINT);
> -
> + hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
> shared_sint.masked = 1;
> + hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
> +
>
> /* Need to correctly cleanup in the case of SMP!!! */
> /* Disable the interrupt */
> - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
> - shared_sint.as_uint64);
> + hv_get_simp(simp.as_uint64);
>
> - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
> + /*
> + * In Isolation VM, sim and sief pages are allocated by
> + * paravisor. These pages also will be used by kdump
> + * kernel. So just reset enable bit here and keep page
> + * addresses.
> + */
> simp.simp_enabled = 0;
> - simp.base_simp_gpa = 0;
> + if (hv_isolation_type_snp())
> + memunmap(hv_cpu->synic_message_page);
> + else
> + simp.base_simp_gpa = 0;
>
> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
> + hv_set_simp(simp.as_uint64);
>
> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
> + hv_get_siefp(siefp.as_uint64);
> siefp.siefp_enabled = 0;
> - siefp.base_siefp_gpa = 0;
>
> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
> + if (hv_isolation_type_snp())
> + memunmap(hv_cpu->synic_event_page);
> + else
> + siefp.base_siefp_gpa = 0;
> +
> + hv_set_siefp(siefp.as_uint64);
>
> /* Disable the global synic bit */
> - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
> + hv_get_synic_state(sctrl.as_uint64);
> sctrl.enable = 0;
> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
> + hv_set_synic_state(sctrl.as_uint64);
>
> if (vmbus_irq != -1)
> disable_percpu_irq(vmbus_irq);
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index 079988ed45b9..90dac369a2dc 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -23,9 +23,16 @@
> #include <linux/bitops.h>
> #include <linux/cpumask.h>
> #include <linux/nmi.h>
> +#include <asm/svm.h>
> +#include <asm/sev.h>
> #include <asm/ptrace.h>
> +#include <asm/mshyperv.h>
> #include <asm/hyperv-tlfs.h>
>
> +union hv_ghcb {
> + struct ghcb ghcb;
> +} __packed __aligned(PAGE_SIZE);
> +
> struct ms_hyperv_info {
> u32 features;
> u32 priv_high;
> @@ -45,7 +52,7 @@ struct ms_hyperv_info {
> u32 Reserved12 : 20;
> };
> };
> - void __percpu **ghcb_base;
> + union hv_ghcb __percpu **ghcb_base;
> u64 shared_gpa_boundary;
> };
> extern struct ms_hyperv_info ms_hyperv;
> @@ -55,6 +62,7 @@ extern void __percpu **hyperv_pcpu_output_arg;
>
> extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
> extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
> +extern bool hv_isolation_type_snp(void);
>
> /* Helper functions that provide a consistent pattern for checking Hyper-V
> hypercall status. */
> static inline int hv_result(u64 status)
> @@ -149,7 +157,7 @@ static inline void vmbus_signal_eom(struct hv_message
> *msg, u32 old_msg_type)
> * possibly deliver another msg from the
> * hypervisor
> */
> - hv_set_register(HV_REGISTER_EOM, 0);
> + hv_signal_eom();
> }
> }
>
> --
> 2.25.1
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