Revert "x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV"

This reverts commit 007faec014cb5d26983c1f86fd08c6539b41392e.

Now that hyperv does its own protocol negotiation:

  49d6a3c062a1 ("x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM")

revert this exposure of the sev_es_ghcb_hv_call() helper.

Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by：Tianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/r/20220614014553.1915929-1-ltykernel@gmail.com

diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index 1951452..4a23e52 100644 (file)
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -72,7 +72,6 @@ static inline u64 lower_bits(u64 val, unsigned int bits)
 
 struct real_mode_header;
 enum stack_type;
-struct ghcb;
 
 /* Early IDT entry points for #VC handler */
 extern void vc_no_ghcb(void);
@@ -156,11 +155,7 @@ 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(struct ghcb *ghcb,
-                                         bool set_ghcb_msr,
-                                         struct es_em_ctxt *ctxt,
-                                         u64 exit_code, u64 exit_info_1,
-                                         u64 exit_info_2);
+
 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
 {
        int rc;

diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index b478edf..3a5b0c9 100644 (file)
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -219,9 +219,10 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt
        return ES_VMM_ERROR;
 }
 
-enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr,
-                                  struct es_em_ctxt *ctxt, u64 exit_code,
-                                  u64 exit_info_1, u64 exit_info_2)
+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)
 {
        /* Fill in protocol and format specifiers */
        ghcb->protocol_version = ghcb_version;
@@ -231,14 +232,7 @@ enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr,
        ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
        ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
 
-       /*
-        * Hyper-V unenlightened guests use a paravisor for communicating and
-        * GHCB pages are being allocated and set up by that paravisor. Linux
-        * should not change the GHCB page's physical address.
-        */
-       if (set_ghcb_msr)
-               sev_es_wr_ghcb_msr(__pa(ghcb));
-
+       sev_es_wr_ghcb_msr(__pa(ghcb));
        VMGEXIT();
 
        return verify_exception_info(ghcb, ctxt);
@@ -795,7 +789,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
                 */
                sw_scratch = __pa(ghcb) + offsetof(struct ghcb, shared_buffer);
                ghcb_set_sw_scratch(ghcb, sw_scratch);
-               ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_IOIO,
+               ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO,
                                          exit_info_1, exit_info_2);
                if (ret != ES_OK)
                        return ret;
@@ -837,8 +831,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
 
                ghcb_set_rax(ghcb, rax);
 
-               ret = sev_es_ghcb_hv_call(ghcb, true, ctxt,
-                                         SVM_EXIT_IOIO, exit_info_1, 0);
+               ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO, exit_info_1, 0);
                if (ret != ES_OK)
                        return ret;
 
@@ -894,7 +887,7 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb,
                /* xgetbv will cause #GP - use reset value for xcr0 */
                ghcb_set_xcr0(ghcb, 1);
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_CPUID, 0, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_CPUID, 0, 0);
        if (ret != ES_OK)
                return ret;
 
@@ -919,7 +912,7 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb,
        bool rdtscp = (exit_code == SVM_EXIT_RDTSCP);
        enum es_result ret;
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, 0, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0);
        if (ret != ES_OK)
                return ret;
 

diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index c05f012..63dc626 100644 (file)
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -786,7 +786,7 @@ static int vmgexit_psc(struct snp_psc_desc *desc)
                ghcb_set_sw_scratch(ghcb, (u64)__pa(data));
 
                /* This will advance the shared buffer data points to. */
-               ret = sev_es_ghcb_hv_call(ghcb, true, &ctxt, SVM_VMGEXIT_PSC, 0, 0);
+               ret = sev_es_ghcb_hv_call(ghcb, &ctxt, SVM_VMGEXIT_PSC, 0, 0);
 
                /*
                 * Page State Change VMGEXIT can pass error code through
@@ -1212,8 +1212,7 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
                ghcb_set_rdx(ghcb, regs->dx);
        }
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_MSR,
-                                 exit_info_1, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MSR, exit_info_1, 0);
 
        if ((ret == ES_OK) && (!exit_info_1)) {
                regs->ax = ghcb->save.rax;
@@ -1452,7 +1451,7 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
 
        ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer));
 
-       return sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, exit_info_1, exit_info_2);
+       return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2);
 }
 
 /*
@@ -1628,7 +1627,7 @@ static enum es_result vc_handle_dr7_write(struct ghcb *ghcb,
 
        /* Using a value of 0 for ExitInfo1 means RAX holds the value */
        ghcb_set_rax(ghcb, val);
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
        if (ret != ES_OK)
                return ret;
 
@@ -1658,7 +1657,7 @@ static enum es_result vc_handle_dr7_read(struct ghcb *ghcb,
 static enum es_result vc_handle_wbinvd(struct ghcb *ghcb,
                                       struct es_em_ctxt *ctxt)
 {
-       return sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WBINVD, 0, 0);
+       return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
 }
 
 static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
@@ -1667,7 +1666,7 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt
 
        ghcb_set_rcx(ghcb, ctxt->regs->cx);
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_RDPMC, 0, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);
        if (ret != ES_OK)
                return ret;
 
@@ -1708,7 +1707,7 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
        if (x86_platform.hyper.sev_es_hcall_prepare)
                x86_platform.hyper.sev_es_hcall_prepare(ghcb, ctxt->regs);
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_VMMCALL, 0, 0);
+       ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
        if (ret != ES_OK)
                return ret;
 
@@ -2197,7 +2196,7 @@ int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned
                ghcb_set_rbx(ghcb, input->data_npages);
        }
 
-       ret = sev_es_ghcb_hv_call(ghcb, true, &ctxt, exit_code, input->req_gpa, input->resp_gpa);
+       ret = sev_es_ghcb_hv_call(ghcb, &ctxt, exit_code, input->req_gpa, input->resp_gpa);
        if (ret)
                goto e_put;