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[PATCH v5 02/10] xen: move do_vcpu_op() to arch specific code

From: Juergen Gross <jgross@xxxxxxxx>

Date: Thu, 24 Mar 2022 09:13:04 +0100

Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>

Delivery-date: Thu, 24 Mar 2022 08:13:27 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

The entry point used for the vcpu_op hypercall on Arm is different from the one on x86 today, as some of the common sub-ops are not supported on Arm. The Arm specific handler filters out the not supported sub-ops and then calls the common handler. This leads to the weird call hierarchy: do_arm_vcpu_op() do_vcpu_op() arch_do_vcpu_op() Clean this up by renaming do_vcpu_op() to common_vcpu_op() and arch_do_vcpu_op() in each architecture to do_vcpu_op(). This way one of above calls can be avoided without restricting any potential future use of common sub-ops for Arm. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- V4: - don't remove HYPERCALL_ARM() V4.1: - add missing cf_check (Andrew Cooper) V5: - use v instead of current (Julien Grall) --- xen/arch/arm/domain.c | 15 ++++++++------- xen/arch/arm/include/asm/hypercall.h | 2 -- xen/arch/arm/traps.c | 2 +- xen/arch/x86/domain.c | 12 ++++++++---- xen/arch/x86/include/asm/hypercall.h | 2 +- xen/arch/x86/x86_64/domain.c | 18 +++++++++++++----- xen/common/compat/domain.c | 15 ++++++--------- xen/common/domain.c | 12 ++++-------- xen/include/xen/hypercall.h | 2 +- 9 files changed, 42 insertions(+), 38 deletions(-) diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index 8110c1df86..2f8eaab7b5 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@ -1079,23 +1079,24 @@ void arch_dump_domain_info(struct domain *d) } -long do_arm_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg) +long do_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg) { + struct domain *d = current->domain; + struct vcpu *v; + + if ( (v = domain_vcpu(d, vcpuid)) == NULL ) + return -ENOENT; + switch ( cmd ) { case VCPUOP_register_vcpu_info: case VCPUOP_register_runstate_memory_area: - return do_vcpu_op(cmd, vcpuid, arg); + return common_vcpu_op(cmd, v, arg); default: return -EINVAL; } } -long arch_do_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg) -{ - return -ENOSYS; -} - void arch_dump_vcpu_info(struct vcpu *v) { gic_dump_info(v); diff --git a/xen/arch/arm/include/asm/hypercall.h b/xen/arch/arm/include/asm/hypercall.h index 39d2e7889d..fac4d60f17 100644 --- a/xen/arch/arm/include/asm/hypercall.h +++ b/xen/arch/arm/include/asm/hypercall.h @@ -4,8 +4,6 @@ #include <public/domctl.h> /* for arch_do_domctl */ int do_arm_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg); -long do_arm_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg); - long subarch_do_domctl(struct xen_domctl *domctl, struct domain *d, XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl); diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 43f30747cf..e906bb4a89 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -1380,7 +1380,7 @@ static arm_hypercall_t arm_hypercall_table[] = { #endif HYPERCALL(multicall, 2), HYPERCALL(platform_op, 1), - HYPERCALL_ARM(vcpu_op, 3), + HYPERCALL(vcpu_op, 3), HYPERCALL(vm_assist, 2), #ifdef CONFIG_ARGO HYPERCALL(argo_op, 5), diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index a5048ed654..d566fc82b4 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1489,11 +1489,15 @@ int arch_vcpu_reset(struct vcpu *v) return 0; } -long -arch_do_vcpu_op( - int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg) +long cf_check do_vcpu_op(int cmd, unsigned int vcpuid, + XEN_GUEST_HANDLE_PARAM(void) arg) { long rc = 0; + struct domain *d = current->domain; + struct vcpu *v; + + if ( (v = domain_vcpu(d, vcpuid)) == NULL ) + return -ENOENT; switch ( cmd ) { @@ -1545,7 +1549,7 @@ arch_do_vcpu_op( } default: - rc = -ENOSYS; + rc = common_vcpu_op(cmd, v, arg); break; } diff --git a/xen/arch/x86/include/asm/hypercall.h b/xen/arch/x86/include/asm/hypercall.h index 61bf897147..d6daa7e4cb 100644 --- a/xen/arch/x86/include/asm/hypercall.h +++ b/xen/arch/x86/include/asm/hypercall.h @@ -145,7 +145,7 @@ compat_physdev_op( XEN_GUEST_HANDLE_PARAM(void) arg); extern int -arch_compat_vcpu_op( +compat_common_vcpu_op( int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg); extern int cf_check compat_mmuext_op( diff --git a/xen/arch/x86/x86_64/domain.c b/xen/arch/x86/x86_64/domain.c index c46dccc25a..9c559aa3ea 100644 --- a/xen/arch/x86/x86_64/domain.c +++ b/xen/arch/x86/x86_64/domain.c @@ -12,11 +12,15 @@ CHECK_vcpu_get_physid; #undef xen_vcpu_get_physid -int -arch_compat_vcpu_op( - int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg) +int cf_check +compat_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg) { - int rc = -ENOSYS; + int rc; + struct domain *d = current->domain; + struct vcpu *v; + + if ( (v = domain_vcpu(d, vcpuid)) == NULL ) + return -ENOENT; switch ( cmd ) { @@ -55,7 +59,11 @@ arch_compat_vcpu_op( } case VCPUOP_get_physid: - rc = arch_do_vcpu_op(cmd, v, arg); + rc = do_vcpu_op(cmd, vcpuid, arg); + break; + + default: + rc = compat_common_vcpu_op(cmd, v, arg); break; } diff --git a/xen/common/compat/domain.c b/xen/common/compat/domain.c index afae27eeba..1119534679 100644 --- a/xen/common/compat/domain.c +++ b/xen/common/compat/domain.c @@ -38,15 +38,12 @@ CHECK_vcpu_hvm_context; #endif -int cf_check compat_vcpu_op( - int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg) +int compat_common_vcpu_op(int cmd, struct vcpu *v, + XEN_GUEST_HANDLE_PARAM(void) arg) { - struct domain *d = current->domain; - struct vcpu *v; int rc = 0; - - if ( (v = domain_vcpu(d, vcpuid)) == NULL ) - return -ENOENT; + struct domain *d = current->domain; + unsigned int vcpuid = v->vcpu_id; switch ( cmd ) { @@ -103,7 +100,7 @@ int cf_check compat_vcpu_op( case VCPUOP_stop_singleshot_timer: case VCPUOP_register_vcpu_info: case VCPUOP_send_nmi: - rc = do_vcpu_op(cmd, vcpuid, arg); + rc = common_vcpu_op(cmd, v, arg); break; case VCPUOP_get_runstate_info: @@ -134,7 +131,7 @@ int cf_check compat_vcpu_op( } default: - rc = arch_compat_vcpu_op(cmd, v, arg); + rc = -ENOSYS; break; } diff --git a/xen/common/domain.c b/xen/common/domain.c index 351029f8b2..70747c02e6 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1570,15 +1570,11 @@ int default_initialise_vcpu(struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg) return rc; } -long cf_check do_vcpu_op( - int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg) +long common_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg) { - struct domain *d = current->domain; - struct vcpu *v; long rc = 0; - - if ( (v = domain_vcpu(d, vcpuid)) == NULL ) - return -ENOENT; + struct domain *d = v->domain; + unsigned int vcpuid = v->vcpu_id; switch ( cmd ) { @@ -1750,7 +1746,7 @@ long cf_check do_vcpu_op( } default: - rc = arch_do_vcpu_op(cmd, v, arg); + rc = -ENOSYS; break; } diff --git a/xen/include/xen/hypercall.h b/xen/include/xen/hypercall.h index a1b6575976..81aae7a662 100644 --- a/xen/include/xen/hypercall.h +++ b/xen/include/xen/hypercall.h @@ -110,7 +110,7 @@ do_vcpu_op( struct vcpu; extern long -arch_do_vcpu_op(int cmd, +common_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg); -- 2.34.1

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